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Elie Kamseu
Laboratory of Materials, Local Materials Promotion Authority, MINRESI/MIPROMALO, Yaoundé, Cameroon, Po. Box 2396, Yaoundé, Cameroon

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Journal article
Published: 22 June 2021 in Materials Chemistry and Physics
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The present work carried out the influence of curing cycles on the performance of laterite-based geopolymer composites. To do so, the end products were obtained by altering laterite with 15, 20, and 25 wt% of rice husk ash (RHA). Alkaline solution in a constant solid/liquid ratio of 0.35 was added together with fine and coarse aggregates (representing equal and double weight of laterite, respectively). The different obtained matrices were treated in the following three curing cycles before characterization: room temperature curing (RTC), oven curing at 80 °C (OTC) and controlled humidity steam curing at 80 °C (STC). The mechanical tests carried out at 28 days give the following maximum values for each curing mode: 16.40, 28.82 and 56.41 MPa for RTC, OTC, and STC modes respectively. This means that when the samples, submitted in a moisture-controlled environment, the end products are more stable, less porous and resistant. Regarding the physical properties, the results show that the maximum value of open porosity is 11.62% corresponding to a matrix that was cured at room temperature without rice husk ash added, while the minimum value of 7% corresponds to a matrix that was cured under controlled humidity and containing 20% rice husk ash. The optimum and minimum absorption values are 2.70 and 4.60% respectively for the OTC and RTC curing modes. As for bulk densities, the optimum value is 2.64 g cm−3 for the matrix having 15% rice husk ash and the minimum value is 2.33 g cm−3 for a matrix having 20% rice husk ash, for OTC and STC curing modes respectively. The appropriate curing type for laterite-based geopolymer is when the humidity is controlled.

ACS Style

Joelle Nadia Nouping Fekoua; Cyriaque Rodrigue Kaze; Linda Lekuna Duna; Armeni Ghazouni; Ibrahim Mbouombuo Ndassa; Elie Kamseu; Sylvie Rossignol; Cristina Leonelli. Effects of curing cycles on developing strength and microstructure of goethite-rich aluminosilicate (corroded laterite) based geopolymer composites. Materials Chemistry and Physics 2021, 270, 124864 .

AMA Style

Joelle Nadia Nouping Fekoua, Cyriaque Rodrigue Kaze, Linda Lekuna Duna, Armeni Ghazouni, Ibrahim Mbouombuo Ndassa, Elie Kamseu, Sylvie Rossignol, Cristina Leonelli. Effects of curing cycles on developing strength and microstructure of goethite-rich aluminosilicate (corroded laterite) based geopolymer composites. Materials Chemistry and Physics. 2021; 270 ():124864.

Chicago/Turabian Style

Joelle Nadia Nouping Fekoua; Cyriaque Rodrigue Kaze; Linda Lekuna Duna; Armeni Ghazouni; Ibrahim Mbouombuo Ndassa; Elie Kamseu; Sylvie Rossignol; Cristina Leonelli. 2021. "Effects of curing cycles on developing strength and microstructure of goethite-rich aluminosilicate (corroded laterite) based geopolymer composites." Materials Chemistry and Physics 270, no. : 124864.

Original paper
Published: 15 June 2021 in Silicon
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Five different alkali activators were prepared by mixing sodium hydroxide with molar concentrations of 8, 10, 12, 14 and 16 M and sodium silicate, Na2SiO3 in volume ratio 1:1. The obtained alkaline activators were used for producing metakaolin/feldspathic rock-based geopolymer composites. These geopolymer composites were obtained by mixing different solid precursors of natural solid solutions (trachyte, pegmatite and granite) in the range of 70 to 85 wt% with metakaolin and adding each alkaline solution at a liquid/solid mass ratio of 0.37. The pastes were cured at room temperature for 28 days before testing. The influence of NaOH concentration on structural modifications was investigated using Fourier Transform Infrared Spectroscopy (FTIR) and X-Ray Diffraction (XRD). Water absorption for open porosity, Environment Scanning Electron Microscope (ESEM) and compression tests were adopted to observe the morphology and mechanical properties. The results indicate that the NaOH concentration of 12 M was optimum for solid solution of trachyte with 98–106 MPa due to content of higher amorphous phases compared to solid solutions of pegmatite (94–105 MPa) or granite (101–108 MPa) where the better results were achieved at 10 M.

ACS Style

Achile Nana; Sylvain Tomé; Sybilline Claudelle Djadock Anensong; Paul Venyite; Jean Noel Yankwa Djobo; Jean Ngouné; Elie Kamseu; Maria Chiara Bignozzi; Cristina Leonelli. Mechanical Performance, Phase Evolution and Microstructure of Natural Feldspathic Solid Solutions Consolidated Via Alkali Activation: Effect of NaOH Concentration. Silicon 2021, 1 -14.

AMA Style

Achile Nana, Sylvain Tomé, Sybilline Claudelle Djadock Anensong, Paul Venyite, Jean Noel Yankwa Djobo, Jean Ngouné, Elie Kamseu, Maria Chiara Bignozzi, Cristina Leonelli. Mechanical Performance, Phase Evolution and Microstructure of Natural Feldspathic Solid Solutions Consolidated Via Alkali Activation: Effect of NaOH Concentration. Silicon. 2021; ():1-14.

Chicago/Turabian Style

Achile Nana; Sylvain Tomé; Sybilline Claudelle Djadock Anensong; Paul Venyite; Jean Noel Yankwa Djobo; Jean Ngouné; Elie Kamseu; Maria Chiara Bignozzi; Cristina Leonelli. 2021. "Mechanical Performance, Phase Evolution and Microstructure of Natural Feldspathic Solid Solutions Consolidated Via Alkali Activation: Effect of NaOH Concentration." Silicon , no. : 1-14.

Journal article
Published: 28 May 2021 in Materials
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The present project investigated the thermal stability of cold-setting refractory composites under high-temperature cycles. The proposed route dealt with the feasibility of using fillers with different particle sizes and studying their influence on the thermo-mechanical properties of refractory geopolymer composites. The volumetric shrinkage was studied with respect to particle sizes of fillers (80, 200 and 500 µm), treatment temperature (1050–1250 °C) and amount of fillers (70–85 wt.%). The results, combined with thermal analysis, indicated the efficiency of refractory-based kyanite aggregates for enhancing thermo-mechanical properties. At low temperatures, larger amounts of kyanite aggregates promoted mechanical strength development. Flexural strengths of 45, 42 and 40 MPa were obtained for geopolymer samples, respectively, at 1200 °C, made with filler particles sieved at 80, 200 and 500 µm. In addition, a sintering temperature equal to 1200 °C appeared beneficial for the promotion of densification as well as bonding between kyanite aggregates and the matrix, contributing to the reinforcement of the refractory geopolymer composites without any sign of vitrification. From the obtained properties of thermal stability, good densification and high strength, kyanite aggregates are efficient and promising candidates for the production of environmentally friendly, castable refractory composites.

ACS Style

Juvenal Deutou; Rodrigue Kaze; Elie Kamseu; Vincenzo Sglavo. Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers. Materials 2021, 14, 2903 .

AMA Style

Juvenal Deutou, Rodrigue Kaze, Elie Kamseu, Vincenzo Sglavo. Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers. Materials. 2021; 14 (11):2903.

Chicago/Turabian Style

Juvenal Deutou; Rodrigue Kaze; Elie Kamseu; Vincenzo Sglavo. 2021. "Controlling the Thermal Stability of Kyanite-Based Refractory Geopolymers." Materials 14, no. 11: 2903.

Article
Published: 12 May 2021 in Transport in Porous Media
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Thermophysical and microstructural behavior of eleven tropical woods widely available and commonly used was investigated. Experimental measurements of thermal conductivity and thermal diffusivity of wood were performed using the heat flow meter and transient plane source technique. The results show values in the range of 0.2–0.37 mm2/s for thermal diffusivity and 0.12–0.34 W m−1 K−1 for thermal conductivity. The correlation between the thermal conductivity and parameters as porosity, pore size distribution, intensity ratio of lignin and microstructure was drawn. The thermal conductivity of wood decreases with the increase in pores volume (vp). For vp > 70%, the values are between 0.1 and 0.15 W m−1 K−1 and reach 0.23 W m−1 K−1 for vp between 40 and 60%. For dense woods with the vp less than 40%, the values are between 0.24 and 0.35 W m−1 K−1. The results show experimental values of the effective thermal conductivity of wood species closer to the values of parallel model. The presence of ray and parenchyma which appear perpendicular to the axis of the fibers in the structure of the wood species makes it difficult to have straight correlation. This suggests that heat flux which travels through the matrix of wood follows a very complex road linked to the microstructural features of each class of wood. These results appear as significant contribution for the future development of sustainable energy technologies in relation to the prediction of energy saving and building energy metering.

ACS Style

E. Soubgui Nouemsi; Zenabou N. M. Ngouloure; J. C. Bidoung; E. Kamseu; Sylvie Rossignol; Cristina Leonelli. Dependence of the insulating behavior of some common woods to the pore network and packing density of their fibers: a microstructural approach. Transport in Porous Media 2021, 1 -28.

AMA Style

E. Soubgui Nouemsi, Zenabou N. M. Ngouloure, J. C. Bidoung, E. Kamseu, Sylvie Rossignol, Cristina Leonelli. Dependence of the insulating behavior of some common woods to the pore network and packing density of their fibers: a microstructural approach. Transport in Porous Media. 2021; ():1-28.

Chicago/Turabian Style

E. Soubgui Nouemsi; Zenabou N. M. Ngouloure; J. C. Bidoung; E. Kamseu; Sylvie Rossignol; Cristina Leonelli. 2021. "Dependence of the insulating behavior of some common woods to the pore network and packing density of their fibers: a microstructural approach." Transport in Porous Media , no. : 1-28.

Journal article
Published: 13 April 2021 in Materials Chemistry and Physics
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This research reports on the influence of particle size and distribution on the physical, mechanical and microstructural features of solid solutions (feldspathic materials) based inorganic polymer composites (IPCs). Both granite and pegmatite were ground to different degree of finess making four different granulometry with particles of 63, 80, 125 and 200 μm. The respective mixes receive 15 wt% of metakaolin and were activated with a well designed alkaline solution. Matrices obtained showed high compressive and flexural strengths in the range 101.2–131.3 MPa, and 29–35.5 MPa, respectively. It was observed that the optimum mechanical performance of these matrices can be achieved through a mix-design of different grades of granulometry. This was suggested by mechanism combining reactivity and particles packing. In fact, although it can be expected that the finess of the combination of the particles size under 63 μm might present the better reactivity, it is showing that the combination of fine, medium and coarse particles is efficient in achieving denser and tougher microstructure. Lower cumulative pore volume (17 mL g−1) of the composites based on pegmatite, value not far from that of natural stones, resulted in a higher impact resistance of 3.03 J. It was concluded that designing the feldspathic rock-based composites with high strengths appear as sustainable, low energy consumption and environmentally-friendly materials for the structural construction.

ACS Style

Achile Nana; Elie Kamseu; Ange-Therese Akono; Jean Ngouné; Jean Noel Yankwa Djobo; Hervé Kouamo Tchakouté; Maria Chiara Bignozzi; Cristina Leonelli. Particles size and distribution on the improvement of the mechanical performance of high strength solid solution based inorganic polymer composites: A microstructural approach. Materials Chemistry and Physics 2021, 267, 124602 .

AMA Style

Achile Nana, Elie Kamseu, Ange-Therese Akono, Jean Ngouné, Jean Noel Yankwa Djobo, Hervé Kouamo Tchakouté, Maria Chiara Bignozzi, Cristina Leonelli. Particles size and distribution on the improvement of the mechanical performance of high strength solid solution based inorganic polymer composites: A microstructural approach. Materials Chemistry and Physics. 2021; 267 ():124602.

Chicago/Turabian Style

Achile Nana; Elie Kamseu; Ange-Therese Akono; Jean Ngouné; Jean Noel Yankwa Djobo; Hervé Kouamo Tchakouté; Maria Chiara Bignozzi; Cristina Leonelli. 2021. "Particles size and distribution on the improvement of the mechanical performance of high strength solid solution based inorganic polymer composites: A microstructural approach." Materials Chemistry and Physics 267, no. : 124602.

Journal article
Published: 04 April 2021 in Materialia
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The physical, mechanical and microstructural properties of metakaolin/volcanic ash-based geopolymer composites were investigated, as well as the influence of the incorporation of a reactive silica from rice husk ash (RHA) in their performance. The geopolymer composites were designed by replacing metakaolin with volcanic ash, VA (10–30 wt%) and RHA (0–20 wt%). Physical and mechanical testing, FTIR, XRD, optical microscopic and SEM were used to characterize the geopolymer composites. The results showed that the mechanical strengths and physical properties were mostly affected by the VA content as well as RHA content where the optimal mechanical strengths (19.3 and 60.73 MPa for flexural and compressive strength, respectively) were obtained with the composite sample containing 20 wt% of VA and 10 wt% of RHA. This was due to the additive that enhances the compactness and microstructure of geopolymer matrices obtained and also the increase of SiO2/Al2O3 ratio with the addition of RHA. Synergistic use of metakaolin, volcanic ash, and rice husk ash for construction materials through alkaline activation looks like the upcoming trend to valorize these materials.

ACS Style

Achile Nana; Noela Epey; Kaze Cyriaque Rodrique; Juvenal Giogetti Nemaleu Deutou; Jean Noel Yankwa Djobo; Sylvain Tomé; Thamer Salman Alomayri; Jean Ngouné; Elie Kamseu; Cristina Leonelli. Mechanical strength and microstructure of metakaolin/volcanic ash-based geopolymer composites reinforced with reactive silica from rice husk ash (RHA). Materialia 2021, 16, 101083 .

AMA Style

Achile Nana, Noela Epey, Kaze Cyriaque Rodrique, Juvenal Giogetti Nemaleu Deutou, Jean Noel Yankwa Djobo, Sylvain Tomé, Thamer Salman Alomayri, Jean Ngouné, Elie Kamseu, Cristina Leonelli. Mechanical strength and microstructure of metakaolin/volcanic ash-based geopolymer composites reinforced with reactive silica from rice husk ash (RHA). Materialia. 2021; 16 ():101083.

Chicago/Turabian Style

Achile Nana; Noela Epey; Kaze Cyriaque Rodrique; Juvenal Giogetti Nemaleu Deutou; Jean Noel Yankwa Djobo; Sylvain Tomé; Thamer Salman Alomayri; Jean Ngouné; Elie Kamseu; Cristina Leonelli. 2021. "Mechanical strength and microstructure of metakaolin/volcanic ash-based geopolymer composites reinforced with reactive silica from rice husk ash (RHA)." Materialia 16, no. : 101083.

Article
Published: 15 February 2021 in Journal of Thermal Analysis and Calorimetry
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Two calcined clays (halloysite and kaolinite clays at 700 °C) were used as solid precursors for geopolymer synthesis. This study compares the physicochemical properties of the both resulting geopolymer series heated at 200, 400, 600 and 800 °C. The end specimens were characterized using Optical Dilatometer, XRD, FTIR, MIP and SEM analyses. Results revealed that the flexural strengths were 18.10 and 21.74 MPa for meta-halloysite- and metakaolin-based geopolymers, respectively. After subjected to high temperatures, the flexural strength drastically decreased from 18.10 ± 1.06 to 6.7 ± 0.23 MPa and 21.74 ± 1.20 to 4.63 ± 0.24 MPa, respectively. The maximum shrinkage recorded on metakaolin and meta-halloysite-based geopolymers was 14 and 16% around 950 °C, respectively. The thermal conductivities decreased with increase in heating temperature from 0.78 to 0.19 Wm−1 K−1 and 0.96 to 0.26 Wm−1 K−1, respectively. This reduction is linked to the additional voids and microcracks that occurred within the geopolymer network. The cumulative intrusion in both geopolymers increased with increase in heating temperature up to 600 °C, leading to the degradation of geopolymer network that affected the mechanical strength evolution. Both synthesized geopolymer series are potential candidates for insulation materials or refractory applications.

ACS Style

Cyriaque Rodrigue Kaze; Achile Nana; Gisèle Laure Lecomte-Nana; Juvenal G. N. Deutou; Elie Kamseu; Uphie Chinje Melo; Fernanda Andreola; Cristina Leonelli. Thermal behaviour and microstructural evolution of metakaolin and meta-halloysite-based geopolymer binders: a comparative study. Journal of Thermal Analysis and Calorimetry 2021, 1 -17.

AMA Style

Cyriaque Rodrigue Kaze, Achile Nana, Gisèle Laure Lecomte-Nana, Juvenal G. N. Deutou, Elie Kamseu, Uphie Chinje Melo, Fernanda Andreola, Cristina Leonelli. Thermal behaviour and microstructural evolution of metakaolin and meta-halloysite-based geopolymer binders: a comparative study. Journal of Thermal Analysis and Calorimetry. 2021; ():1-17.

Chicago/Turabian Style

Cyriaque Rodrigue Kaze; Achile Nana; Gisèle Laure Lecomte-Nana; Juvenal G. N. Deutou; Elie Kamseu; Uphie Chinje Melo; Fernanda Andreola; Cristina Leonelli. 2021. "Thermal behaviour and microstructural evolution of metakaolin and meta-halloysite-based geopolymer binders: a comparative study." Journal of Thermal Analysis and Calorimetry , no. : 1-17.

Original paper
Published: 04 February 2021 in Silicon
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The present study deals with the use of locally prepared rice husk ash (RHA)-based sodium silicate for alkaline activation of laterites (uncalcined (LNW) and calcined (LCA)). RHA-based activator (SSR) was prepared by adding as-collected RHA to 6 M NaOH at a solid/liquid mass ratio of 0.56. The various proportions of metakaolin (MK) and basalt powder (BA) influenced the final properties of the geopolymer products. After 28 days of curing at room temperature, XRD, SEM and FT-IR analyses were used to study the evolution phases. Uncalcined laterite-based formulations showed their highest compressive strength at 29.86 MPa with 20 wt.% of MK, whereas calcined ones showed the most elevated strength at 47.02 MPa, with the addition of 25 wt.% MK. Further additions above these thresholds tend to reduce strength and increase setting time. Substitution of calcined laterite with basalt powder permitted to control the porosity of samples at low values with the consequent reduction of strength. In general, the water absorption and apparent porosity decrease with addition of metakaolin in raw laterite-based formulations and relatively decrease with addition of basalt powder in calcined laterite-based formulations, while bulk density remains relatively constant. The locally produced RHA-based alkaline activator is efficient for laterite geopolymerization, resulting in products with robust mechanical and physical properties capable of fostering application in quality housing.

ACS Style

Paul Venyite; Eugene Charles Makone; Rodrigue Cyriaque Kaze; Achile Nana; Juvenal Giogetti Deutou Nemaleu; Elie Kamseu; Uphie Chinje Melo; Cristina Leonelli. Effect of Combined Metakaolin and Basalt Powder Additions to Laterite-Based Geopolymers Activated by Rice Husk Ash (RHA)/NaOH Solution. Silicon 2021, 1 -20.

AMA Style

Paul Venyite, Eugene Charles Makone, Rodrigue Cyriaque Kaze, Achile Nana, Juvenal Giogetti Deutou Nemaleu, Elie Kamseu, Uphie Chinje Melo, Cristina Leonelli. Effect of Combined Metakaolin and Basalt Powder Additions to Laterite-Based Geopolymers Activated by Rice Husk Ash (RHA)/NaOH Solution. Silicon. 2021; ():1-20.

Chicago/Turabian Style

Paul Venyite; Eugene Charles Makone; Rodrigue Cyriaque Kaze; Achile Nana; Juvenal Giogetti Deutou Nemaleu; Elie Kamseu; Uphie Chinje Melo; Cristina Leonelli. 2021. "Effect of Combined Metakaolin and Basalt Powder Additions to Laterite-Based Geopolymers Activated by Rice Husk Ash (RHA)/NaOH Solution." Silicon , no. : 1-20.

Journal article
Published: 24 December 2020 in Construction and Building Materials
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The thermal performance of pegmatite-based geopolymer composites is investigated. Dense and compact matrix was prepared replacing metakaolin with pegmatite in the range of 70–85 wt% and activate with sodium hydroxide/sodium silicate solution in 1:1 vol ratio. The products of geopolymerization, cured at room temperature for 28 days, were heated at 100, 200, 400, 600, 800, 900, 1000 and 1100 °C with 2 h soaking time. The high values of flexural strength (46–51 MPa) were observed at 1000 °C as the consequences of low porosity (173 mm3/g) and water absorption (4.50–5.62%). The increase of the vitrification at 1100 °C enhanced the liquid phase and develop porosities responsible for reduction of strength. The mechanical properties, microstructural evolution and pore size distribution were found to be influenced by the amount of fine powder of pegmatite (solid solution).

ACS Style

Achile Nana; Rodrigue Cyriaque Kaze; Thamer Salman Alomayri; Hasan Suliman Assaedi; Juvenal Giogetti Nemaleu Deutou; Jean Ngouné; Hervé Kouamo Tchakouté; Elie Kamseu; Cristina Leonelli. Innovative porous ceramic matrices from inorganic polymer composites (IPCs): Microstructure and mechanical properties. Construction and Building Materials 2020, 273, 122032 .

AMA Style

Achile Nana, Rodrigue Cyriaque Kaze, Thamer Salman Alomayri, Hasan Suliman Assaedi, Juvenal Giogetti Nemaleu Deutou, Jean Ngouné, Hervé Kouamo Tchakouté, Elie Kamseu, Cristina Leonelli. Innovative porous ceramic matrices from inorganic polymer composites (IPCs): Microstructure and mechanical properties. Construction and Building Materials. 2020; 273 ():122032.

Chicago/Turabian Style

Achile Nana; Rodrigue Cyriaque Kaze; Thamer Salman Alomayri; Hasan Suliman Assaedi; Juvenal Giogetti Nemaleu Deutou; Jean Ngouné; Hervé Kouamo Tchakouté; Elie Kamseu; Cristina Leonelli. 2020. "Innovative porous ceramic matrices from inorganic polymer composites (IPCs): Microstructure and mechanical properties." Construction and Building Materials 273, no. : 122032.

Original paper
Published: 10 November 2020 in Silicon
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The synthesis, mechanical behaviour, and microstructure of metakaolin-based geopolymer mortar reinforced with quartz sand are presented in this investigation. Fine sand (quartz sand) aggregate were added in different proportions of 50, 60, 70 or 80 wt.% to prepare the fresh metakaolin-based geopolymer paste. The geopolymer mortar was achieved by a mixture of geopolymer paste and river sand in the ratio 2:5 by mass. The mixture of sodium hydroxide solution (10 M) and sodium silicate solution (Na2SiO3) in a volume ratio of 2:3 was used as an alkaline activator. All the specimens were cured at room temperature and tested after 28 days of curing. The investigations on microstructure and physical properties indicated a significant reduction of the open pores and interconnection of micro and meso cracks in the structure network with increase in the amount of quartz sand. As a consequence, the samples show a good mechanical strength principally with the addition of 60 wt.% of quartz sand to binder with values of 8 and 66 MPa for flexural strength and compressive strength, respectively.

ACS Style

Achile Nana; Thamer Salman Alomayri; Paul Venyite; Rodrigue C. Kaze; Hasan Suliman Assaedi; Christelle Bewa Nobouassia; Jordan Valdès Metekong Sontia; Jean Ngouné; Elie Kamseu; Cristina Leonelli. Mechanical Properties and Microstructure of a Metakaolin-Based Inorganic Polymer Mortar Reinforced with Quartz Sand. Silicon 2020, 1 -12.

AMA Style

Achile Nana, Thamer Salman Alomayri, Paul Venyite, Rodrigue C. Kaze, Hasan Suliman Assaedi, Christelle Bewa Nobouassia, Jordan Valdès Metekong Sontia, Jean Ngouné, Elie Kamseu, Cristina Leonelli. Mechanical Properties and Microstructure of a Metakaolin-Based Inorganic Polymer Mortar Reinforced with Quartz Sand. Silicon. 2020; ():1-12.

Chicago/Turabian Style

Achile Nana; Thamer Salman Alomayri; Paul Venyite; Rodrigue C. Kaze; Hasan Suliman Assaedi; Christelle Bewa Nobouassia; Jordan Valdès Metekong Sontia; Jean Ngouné; Elie Kamseu; Cristina Leonelli. 2020. "Mechanical Properties and Microstructure of a Metakaolin-Based Inorganic Polymer Mortar Reinforced with Quartz Sand." Silicon , no. : 1-12.

Research article
Published: 27 August 2020 in SN Applied Sciences
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This study aimed to investigate the effect of Titanium Dioxide TiO2 (anatase and rutile) on mechanical and microstructural properties of meta-halloysite based geopolymer mortars namely GMHA and GMHR series. Meta-halloysite received 2.5, 5.0, 7.5 and 10 wt% of anatase or rutile as addition before calcination and geopolymerization. The raw materials and the end products were characterized using XRD, FTIR, ESEM and MIP analyses. The flexural strength increases from 6.90 to 9.13 MPa and from 6.90 to 12.33 MPa for GMHA and GMHR series respectively. The cumulative pore volume decreases from 102.2 to 84.2 mm3 g−1 and from 102.2 to 51.3 mm3 g−1 for GMHA and GMHR products respectively. Both matrices present micrographs with very low capillaries pores and fractured surfaces that confirmed the enhancement of the mechanical properties. It was concluded that TiO2 in both forms is beneficial for the reduction of porosity and densification of geopolymer matrices. Rutile enabled more compact and denser geopolymer structure compared to anatase. The aforementioned results showed the efficiency of both fine TiO2 particles to improve the geopolymer network significant for its durability.

ACS Style

Hawa Mohamed; Juvenal Giogetti Nemaleu Deutou; Cyriaque Rodrigue Kaze; Lynn M. Beleuk À Moungam; Elie Kamseu; Uphie Chinje Melo; Cristina Leonelli. Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content. SN Applied Sciences 2020, 2, 1 -14.

AMA Style

Hawa Mohamed, Juvenal Giogetti Nemaleu Deutou, Cyriaque Rodrigue Kaze, Lynn M. Beleuk À Moungam, Elie Kamseu, Uphie Chinje Melo, Cristina Leonelli. Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content. SN Applied Sciences. 2020; 2 (9):1-14.

Chicago/Turabian Style

Hawa Mohamed; Juvenal Giogetti Nemaleu Deutou; Cyriaque Rodrigue Kaze; Lynn M. Beleuk À Moungam; Elie Kamseu; Uphie Chinje Melo; Cristina Leonelli. 2020. "Mechanical and microstructural properties of geopolymer mortars from meta-halloysite: effect of titanium dioxide TiO2 (anatase and rutile) content." SN Applied Sciences 2, no. 9: 1-14.

Journal article
Published: 21 August 2020 in Applied Clay Science
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Three metakaolins and waste fired brick were used to explore the effects of iron oxide, amorphous silica and quartz in the raw materials on the compressive strength and the microstructural properties of acid-based geopolymers cured at room temperature and 60 °C. Quartz content in the metakaolin from Dibamba is about 22.0 wt% and each other samples contain around 8.0 wt%. Waste fired brick and metakaolin from Bangoua contain nanocrystalline hematite and have higher amorphous silica content. The higher quartz content in the metakaolin from Dibamba could prevent the incorporation of PO4 units in the networks. The compressive strengths of the acid-based geopolymers cured at room temperature are higher (35.3–56.4 MPa) compared to those cured at 60 °C (17.8–32.9 MPa). The higher amorphous silica and nanocrystalline hematite content in the starting materials could accelerate the hardening process. It can be concluded that iron oxide, amorphous silica and quartz in the starting material could affect the compressive strengths of acid-based geopolymers.

ACS Style

Christelle N. Bewa; Hervé K. Tchakouté; Charles Banenzoué; Lorette Cakanou; Theophile T. Mbakop; Elie Kamseu; Claus H. Rüscher. Acid-based geopolymers using waste fired brick and different metakaolins as raw materials. Applied Clay Science 2020, 198, 105813 .

AMA Style

Christelle N. Bewa, Hervé K. Tchakouté, Charles Banenzoué, Lorette Cakanou, Theophile T. Mbakop, Elie Kamseu, Claus H. Rüscher. Acid-based geopolymers using waste fired brick and different metakaolins as raw materials. Applied Clay Science. 2020; 198 ():105813.

Chicago/Turabian Style

Christelle N. Bewa; Hervé K. Tchakouté; Charles Banenzoué; Lorette Cakanou; Theophile T. Mbakop; Elie Kamseu; Claus H. Rüscher. 2020. "Acid-based geopolymers using waste fired brick and different metakaolins as raw materials." Applied Clay Science 198, no. : 105813.

Review article
Published: 03 August 2020 in Journal of Cleaner Production
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This review retrieves the determinant role of the solid precursor on the definition, chemistry, processing and applications of geopolymers. It is demonstrated that the process, the alkaline solution, the curing conditions as well as the orientation of the end-products in term of performance and potential application are governed by the intrinsic nature and characteristics of the aluminosilicate precursors. In particular, the amorphous fraction and the available Al and Si cations governs the geopolymerization. Solid precursors with relatively large amount of amorphous phase are easily activated with standard alkaline solution (6–8 M) leading to the formation of a gel, designated as cement or binder. Al-rich gels are efficient for the design of high strength concretes or composites. Solid precursors with low amorphous fraction need relatively high concentrated alkaline solution (>8 M), particularly aluminosilicates with crystalline habitus such as fly ash, volcanic ash, feldspars, granites, nepheline, etc. In these cases, both the dissolution and the curing steps require temperature above ambient. The pastes produced are dominated by non-reacted or incongruently dissolved particles more addressed for mortars and precast. When high concentrated alkaline solution is used, some additions of Si-rich or Al-rich reactive materials are needed to stabilize the extra alkali present within the matrix: steam or long-term curing are, therefore, required. Regarding the curing conditions, the temperature and relative humidity to be applied are directly linked to the nature of the solid precursor. This paper should be viewed as a significant contribution for the understanding and classification of geopolymer cement and composites as well as the science and technology of the geopolymers.

ACS Style

Elie Kamseu; Valeria Alzari; Daniele Nuvoli; Davide Sanna; Isabella Lancellotti; Alberto Mariani; Cristina Leonelli. Dependence of the geopolymerization process and end-products to the nature of solid precursors: Challenge of the sustainability. Journal of Cleaner Production 2020, 278, 123587 .

AMA Style

Elie Kamseu, Valeria Alzari, Daniele Nuvoli, Davide Sanna, Isabella Lancellotti, Alberto Mariani, Cristina Leonelli. Dependence of the geopolymerization process and end-products to the nature of solid precursors: Challenge of the sustainability. Journal of Cleaner Production. 2020; 278 ():123587.

Chicago/Turabian Style

Elie Kamseu; Valeria Alzari; Daniele Nuvoli; Davide Sanna; Isabella Lancellotti; Alberto Mariani; Cristina Leonelli. 2020. "Dependence of the geopolymerization process and end-products to the nature of solid precursors: Challenge of the sustainability." Journal of Cleaner Production 278, no. : 123587.

Journal article
Published: 24 July 2020 in Applied Clay Science
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In this paper, four samples of meta-halloysite from widely available Cameroon halloysite clay calcined at 600, 650, 700 and 750 °C, respectively, and the resultant geopolymer binders were systematically characterized. Isothermal conduction calorimetry (ICC) was used to measure the reaction kinetics of meta-halloysite geopolymers at room temperature during 48 h. The increase in reaction rate and in heat released correlates with the thermal activation temperature. It was typically found that the increase of thermal activation temperature (from 600 to 750 °C) enhances the amorphous or reactive phase content from MH600 to MH750 samples. This results in an improvement of rheological behaviour and setting time of the fresh meta-halloysite based geopolymer pastes. The hardened meta-halloysite based geopolymers were amorphous, compact and dense according to X-ray diffractometry (XRD) and Scanning Electron Microscopy (SEM). The compressive strength of resultant products increased with the activation temperature, up to 750 °C (74 MPa at 180 days). Therefore, the best temperature in view of the highest strength of meta-halloysite geopolymer cured at room temperature is 750 °C, although the lower increase in mechanical performance (7.3%) gained between GPMH700 and GPMH750 is limited. Thus, thermally activated halloysite clay appears to be a promising candidate for geopolymer synthesis.

ACS Style

Cyriaque Rodrigue Kaze; Thamer Alomayri; Assaedi Hasan; Sylvain Tome; Gisèle Laure Lecomte-Nana; Juvenal Giogetti Deutou Nemaleu; Herve Kouamo Tchakoute; Elie Kamseu; Uphie Chinje Melo; Hubert Rahier. Reaction kinetics and rheological behaviour of meta-halloysite based geopolymer cured at room temperature: Effect of thermal activation on physicochemical and microstructural properties. Applied Clay Science 2020, 196, 105773 .

AMA Style

Cyriaque Rodrigue Kaze, Thamer Alomayri, Assaedi Hasan, Sylvain Tome, Gisèle Laure Lecomte-Nana, Juvenal Giogetti Deutou Nemaleu, Herve Kouamo Tchakoute, Elie Kamseu, Uphie Chinje Melo, Hubert Rahier. Reaction kinetics and rheological behaviour of meta-halloysite based geopolymer cured at room temperature: Effect of thermal activation on physicochemical and microstructural properties. Applied Clay Science. 2020; 196 ():105773.

Chicago/Turabian Style

Cyriaque Rodrigue Kaze; Thamer Alomayri; Assaedi Hasan; Sylvain Tome; Gisèle Laure Lecomte-Nana; Juvenal Giogetti Deutou Nemaleu; Herve Kouamo Tchakoute; Elie Kamseu; Uphie Chinje Melo; Hubert Rahier. 2020. "Reaction kinetics and rheological behaviour of meta-halloysite based geopolymer cured at room temperature: Effect of thermal activation on physicochemical and microstructural properties." Applied Clay Science 196, no. : 105773.

Article
Published: 21 June 2020 in Journal of Thermal Analysis and Calorimetry
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The influence of drying on the microstructure, physical and chemical properties of some tropical wood species has been investigated using thermogravimetric analysis, differential scanning calorimetric (DSC), FTIR-ATR spectroscopy, mercury intrusion porosimetry (MIP) and environmental scanning electron microscopy (ESEM) analysis. Eleven tropical species were used in this study. Results showed that the common Cameroonian wood species can be grouped into three classes: Ga (lightwood) with cross-linking fibers having high volume of macropores, density in the range 0.2–0.4 g cm−3 and high lignin content; Gb (medium dense) with unidirectional fibers packing, density around 0.6 g cm−3 and Gc group showing high densification of unidirectional fibers and low porosity justifying the density > 0.8 g cm−3. Both the Gb an Gc groups have less significant lignin content. A relatively high rate of drying for Ga with respect to low drying rate for Gc was observed in direct relation with their porosity of ~ 72 Vol% and ~ 36 Vol%, respectively. LTF and WG showed similar cumulative pore volume (0.44 mL g−1) with different pore size distribution: 28% and 22% of macropores, 39% and 60% of mesopores and 33% and 18% micropores, respectively. Thermal analysis revealed that lightwoods have the highest amounts of residues and lower thermal stability of chemical components than dense woods. It has been found that the degradation process of hemicellulose, cellulose and lignin occurs mainly at about 200–300 °C, 300–350 °C and 350–500 °C, respectively. The group Ga with low drying rate, a low cycle of reproduction, a high volume of porosity together with large pore sizes appeared promising candidates for the design of ecological, environmental and sustainable management policy of wood transformation in developing countries and even worldwide.

ACS Style

Epiphanie Nouemsi Soubgui; Rufin Theophile Tene Fongang; Elie Kamseu; Rene Oum Lissouck; Fernanda Andreola; Likiby Boubakar; Sylvie Rossignol; Cristina Leonelli. Microstructure and physico-chemical transformation of some common woods from Cameroon during drying. Journal of Thermal Analysis and Calorimetry 2020, 145, 3003 -3018.

AMA Style

Epiphanie Nouemsi Soubgui, Rufin Theophile Tene Fongang, Elie Kamseu, Rene Oum Lissouck, Fernanda Andreola, Likiby Boubakar, Sylvie Rossignol, Cristina Leonelli. Microstructure and physico-chemical transformation of some common woods from Cameroon during drying. Journal of Thermal Analysis and Calorimetry. 2020; 145 (6):3003-3018.

Chicago/Turabian Style

Epiphanie Nouemsi Soubgui; Rufin Theophile Tene Fongang; Elie Kamseu; Rene Oum Lissouck; Fernanda Andreola; Likiby Boubakar; Sylvie Rossignol; Cristina Leonelli. 2020. "Microstructure and physico-chemical transformation of some common woods from Cameroon during drying." Journal of Thermal Analysis and Calorimetry 145, no. 6: 3003-3018.

Article
Published: 04 March 2020 in Journal of Thermal Analysis and Calorimetry
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Limestone was used to modify the fluxing action of two potash feldspars (a pure potash feldspar and a soda-potash feldspar) labeled P and C, respectively, in the formulation of porcelain stoneware based on Cameroonian raw materials. The effect of limestone addition (0–10 mass%) was investigated in the range of sintering temperature between 1125 and 1300 °C. Characterization of sintered samples including thermal behavior (DTA, TG and dilatometry test), phase evolution, densification parameters, flexural strength, morphology as well as pores structure was investigated in details. The maximum flexural strength (138 MPa) was obtained at 1175 °C with P series (7 mass% addition of limestone) and at 1200 °C (122 MPa) for C series. The maximum density (≈ 3.1 g cm−3) and lower water absorption (≈ 0%) were obtained at 1200 °C. Mullite and anorthite were identified as main crystalline phases. Starting from 1175 °C and mostly at 1200 °C, the two series compositions (with 7 mass% addition) presented a self-glazing phenomenon which gave them significant brightness and high aesthetic quality; these properties were accomplished only at 1300 °C for reference samples with no lime addition (P0 and C0). A proper addition of limestone (3–7 mass%) with potash feldspar significantly reduced the sintering temperature (~ 150 °C) and permits the production of high strength (122–138 MPa), low energy and sustainable porcelain stoneware.

ACS Style

T. Tchakouteu Mbakop; Juvenal G. Nemaleu Deutou; Likiby Boubakar; Ndigui Billong; U. Chinje Melo; Elie Kamseu; Vincenzo M. Sglavo. Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO. Journal of Thermal Analysis and Calorimetry 2020, 144, 91 -106.

AMA Style

T. Tchakouteu Mbakop, Juvenal G. Nemaleu Deutou, Likiby Boubakar, Ndigui Billong, U. Chinje Melo, Elie Kamseu, Vincenzo M. Sglavo. Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO. Journal of Thermal Analysis and Calorimetry. 2020; 144 (1):91-106.

Chicago/Turabian Style

T. Tchakouteu Mbakop; Juvenal G. Nemaleu Deutou; Likiby Boubakar; Ndigui Billong; U. Chinje Melo; Elie Kamseu; Vincenzo M. Sglavo. 2020. "Enhancing the crystallization phenomena and strength of porcelain stoneware: the role of CaO." Journal of Thermal Analysis and Calorimetry 144, no. 1: 91-106.

Journal article
Published: 17 January 2020 in Applied Clay Science
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This work focuses on the comparison between the mechanical and microstructural properties of poly(sialate-siloxo) networks based on metakaolins from halloysite and kaolin. Poly(sialate-siloxo) networks were prepared using three metakaolins as aluminosilicate sources. Sodium waterglass from rice husk ash and commercial sodium waterglass were used as chemical reagents. The obtained results showed that metakaolins from kaolins have plate shapes with coarse particle sizes whereas the one from halloysite has a spherical morphology and smaller particle sizes. The IR spectra of poly(sialate-siloxo) networks from calcined halloysite indicate the higher value of the wavenumber of the main band. The XRD patterns of all poly(sialate-siloxo) networks show the broad hump structure with higher intensity between 18 and 40°(2θ). The XRD patterns of poly(sialate-siloxo) networks show the band of the unreacted metakaolin at about 20.45°(2θ). This band is more pronounced on the XRD patterns of geopolymer cements from calcined halloysite. The obtained poly(sialate-siloxo) networks based on metakaolins from halloysite and kaolin have a compact, homogenous and denser microstructures. The compressive strength values of the poly(sialate-siloxo) networks using calcined kaolin are ranging from 58.43 to 66.52 MPa whereas those using calcined halloysite are between 72.29 and 88.50 MPa. The compressive strength values of poly(sialate-siloxo) networks using calcined halloysite are higher compared to those from calcined kaolin. The higher compressive strength values of the geopolymer cements from calcined halloysite could be attributed to the fine and spherical particle sizes of calcined halloysite. This implies that the shape and the fine particle sizes of the raw materials influence the properties of the poly(sialate-siloxo) networks. Metakaolin from halloysite can be used as an aluminosilicate source for producing poly(sialate-siloxo) network with higher mechanical properties.

ACS Style

Hervé K. Tchakouté; Sorelle J.K. Melele; Aubin T. Djamen; Cyriaque R. Kaze; Elie Kamseu; Charles N.P. Nanseu; Cristina Leonelli; Claus H. Rüscher. Microstructural and mechanical properties of poly(sialate-siloxo) networks obtained using metakaolins from kaolin and halloysite as aluminosilicate sources: A comparative study. Applied Clay Science 2020, 186, 105448 .

AMA Style

Hervé K. Tchakouté, Sorelle J.K. Melele, Aubin T. Djamen, Cyriaque R. Kaze, Elie Kamseu, Charles N.P. Nanseu, Cristina Leonelli, Claus H. Rüscher. Microstructural and mechanical properties of poly(sialate-siloxo) networks obtained using metakaolins from kaolin and halloysite as aluminosilicate sources: A comparative study. Applied Clay Science. 2020; 186 ():105448.

Chicago/Turabian Style

Hervé K. Tchakouté; Sorelle J.K. Melele; Aubin T. Djamen; Cyriaque R. Kaze; Elie Kamseu; Charles N.P. Nanseu; Cristina Leonelli; Claus H. Rüscher. 2020. "Microstructural and mechanical properties of poly(sialate-siloxo) networks obtained using metakaolins from kaolin and halloysite as aluminosilicate sources: A comparative study." Applied Clay Science 186, no. : 105448.

Journal article
Published: 17 January 2020 in Journal of the European Ceramic Society
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Anorthite-based highly porous membranes were successfully produced using calcined oyster shell to enhance the pore network. The calcined oyster shells produce CaO responsible for the crystallisation of gehlenite and anorthite at relatively low temperature. While the crystallisation produced nano and meso size of intergranular pores, vitrification of feldspar is responsible for development of the capillary porosities. The increasing sintering temperature from 1200 °C to 1300 °C implies the increase in average pores radius from 1.2 μm to 14.3 μm due to the formation of spherical pores from vitrification. The combination of different class of porosities in the matrices results in the interconnection with improvement of the permeability of the porous network. Porosity, permeability and chemical stability were improved with 20 wt.% of calcined oyster shell addition allowing the possible development of high strength porous network which is promising for the membranes support and other applications including liquid separation as well as liquid filtration where high pressure is used.

ACS Style

Juvenal N.G. Deutou; Van Essa L.S. Kamga; R.C. Kaze; E. Kamseu; Vincenzo M. Sglavo. Thermal behaviour and phases evolution during the sintering of porous inorganic membranes. Journal of the European Ceramic Society 2020, 40, 2151 -2162.

AMA Style

Juvenal N.G. Deutou, Van Essa L.S. Kamga, R.C. Kaze, E. Kamseu, Vincenzo M. Sglavo. Thermal behaviour and phases evolution during the sintering of porous inorganic membranes. Journal of the European Ceramic Society. 2020; 40 (5):2151-2162.

Chicago/Turabian Style

Juvenal N.G. Deutou; Van Essa L.S. Kamga; R.C. Kaze; E. Kamseu; Vincenzo M. Sglavo. 2020. "Thermal behaviour and phases evolution during the sintering of porous inorganic membranes." Journal of the European Ceramic Society 40, no. 5: 2151-2162.

Research article
Published: 21 December 2019 in SN Applied Sciences
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Microporous porcelain formulations are successfully carried out through sintering processing. During the thermal treatment of ceramic products, it was found that the addition of kyanite together with ϕ- and γ-Al2O3 allowed to enhance interconnected pores network with micrometric size from 0.1 to 9 µm in a semi-vitrified composite. Between 1200 and 1350 °C, the mullitization of kyanite hindered the extension of vitrification and the growth of acicular mullite from the transformation of metakaolin. The main pores size decreased from 4.33 to 1.54 µm for the formulation containing 32 wt% of kyanite. In this interval the specific pore area increased from 0.64 to 8.75 m2 g−1 due to the total conversion of the kyanite to fibrous and acicular mullite that reduced the voids provided by the earlier mullitization. The improvement in the mullitization without extensive vitrification and grain growth and the reduction of the pores size with the increase in the specific pore area contributed to the formation of a microporous matrix with the Young’s modulus increased from 7 to > 20 GPa. The microstructure of the microporous porcelain, their specific pore area and pores size as well as the interconnection of pores was found innovative for the applications in the field of engineering filtration where high mechanical strength, strain, stiffness and pressure resistance are required.

ACS Style

Juvenal N. G. Deutou; Ntieche Zounedou; Rodrigue C. Kaze; Hawa Mohamed; Tibi Beda; U. C. Melo; Elie Kamseu; Vincenzo M. Sglavo. Semi-vitrified porous kyanite mullite ceramics: Young modulus, microstructure and pore size evolution. SN Applied Sciences 2019, 2, 126 .

AMA Style

Juvenal N. G. Deutou, Ntieche Zounedou, Rodrigue C. Kaze, Hawa Mohamed, Tibi Beda, U. C. Melo, Elie Kamseu, Vincenzo M. Sglavo. Semi-vitrified porous kyanite mullite ceramics: Young modulus, microstructure and pore size evolution. SN Applied Sciences. 2019; 2 (1):126.

Chicago/Turabian Style

Juvenal N. G. Deutou; Ntieche Zounedou; Rodrigue C. Kaze; Hawa Mohamed; Tibi Beda; U. C. Melo; Elie Kamseu; Vincenzo M. Sglavo. 2019. "Semi-vitrified porous kyanite mullite ceramics: Young modulus, microstructure and pore size evolution." SN Applied Sciences 2, no. 1: 126.

Journal article
Published: 15 October 2019 in Materials Chemistry and Physics
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In this paper, the results of the experimental investigation were used to understand the effect of fine meta-halloysite on the reactivity, mechanical and microstructural properties of laterite-based geopolymers. Laterite was replaced by 0, 20, 30 and 50 wt% of meta-halloysite in order to improve the physico-chemical performance. Meta-halloysite was prepared by calcination of natural halloysite at 600 °C. The moduli (molar ratio SiO2/Na2O) of the activating solutions were 1.04, 0.92, and 0.75 with H2O/Na2O = 9.78, 10.45 and 12.04, respectively. The results indicated that calcined laterite has a high specific surface area (43.00 ± 0.12 m2/g), notwithstanding a high average particle size (d50 = 45.20 μm) compared to meta-halloysite with a smaller average particle size (d50 = 8.40 μm) and a specific surface (29.80 ± 0.16 m2/g). The compressive strength of geopolymers increased upon the addition of meta-halloysite from 12 MPa to 45 MPa at 28 days. While the setting time and water absorption decrease with increase in the of meta-halloysite content as well as with increase in Si/Al, Si/Fe, Al/Fe and Na/Al molar ratios used in the synthesis of geopolymers. The use of fine meta-halloysite resulted in better efficiency and improved mechanical performance of synthesized products.

ACS Style

Cyriaque Rodrigue Kaze; Paul Venyite; Achile Nana; Deutou Nemaleu Juvenal; Herve Kouamo Tchakoute; Hubert Rahier; Elie Kamseu; Uphie Chinje Melo; Cristina Leonelli. Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials. Materials Chemistry and Physics 2019, 239, 122268 .

AMA Style

Cyriaque Rodrigue Kaze, Paul Venyite, Achile Nana, Deutou Nemaleu Juvenal, Herve Kouamo Tchakoute, Hubert Rahier, Elie Kamseu, Uphie Chinje Melo, Cristina Leonelli. Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials. Materials Chemistry and Physics. 2019; 239 ():122268.

Chicago/Turabian Style

Cyriaque Rodrigue Kaze; Paul Venyite; Achile Nana; Deutou Nemaleu Juvenal; Herve Kouamo Tchakoute; Hubert Rahier; Elie Kamseu; Uphie Chinje Melo; Cristina Leonelli. 2019. "Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials." Materials Chemistry and Physics 239, no. : 122268.