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Abdelilah Aboulayt
Materials Science, Energy and Nanoengineering Department, Mohamed VI Polytechnic University, Lot 660—Hay Moulay Rachid, Benguerir 43150, Morocco

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Journal article
Published: 20 July 2021 in Sustainability
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The increasing use of geopolymer materials in the construction and civil engineering sectors generates a large amount of non-biodegradable waste that will end up in landfills. It is therefore necessary to anticipate solutions for the proper management of this waste. In this work, new geopolymer materials were fabricated by partially replacing the reactive raw minerals (fly ash, FA, or metakaolin, MK) with used geopolymers (fully fly ash-based, FAref, or metakaolin-based, MKref), in order to develop a strategy to reuse geopolymer waste. Their workability and setting behavior were studied in the fresh state, and the geopolymerization process was investigated by calorimetry and by electrochemistry. Mechanical properties and the ability for coating mineral aggregates were assessed, and the resulting adhesion properties were analyzed using matrix/sand mortars. It appears that the new geopolymer materials as well as the mortars are endowed with good performances. The compressive strengths are above 50 MPa and therefore meet the requirements of different construction materials. This demonstrates the recyclability of geopolymer materials. Moreover, an analysis of the influence of the substitution of recycled geopolymers on the setting and on the mechanical performances of mortars makes it possible to propose a binder-recycled geopolymer interaction model for the formation of new binding matrices.

ACS Style

Rabii Hattaf; Abdelilah Aboulayt; Azzedine Samdi; Nouha Lahlou; Mohamed Ouazzani Touhami; Moussa Gomina; Redouane Moussa. Reusing Geopolymer Waste from Matrices Based on Metakaolin or Fly Ash for the Manufacture of New Binder Geopolymeric Matrices. Sustainability 2021, 13, 8070 .

AMA Style

Rabii Hattaf, Abdelilah Aboulayt, Azzedine Samdi, Nouha Lahlou, Mohamed Ouazzani Touhami, Moussa Gomina, Redouane Moussa. Reusing Geopolymer Waste from Matrices Based on Metakaolin or Fly Ash for the Manufacture of New Binder Geopolymeric Matrices. Sustainability. 2021; 13 (14):8070.

Chicago/Turabian Style

Rabii Hattaf; Abdelilah Aboulayt; Azzedine Samdi; Nouha Lahlou; Mohamed Ouazzani Touhami; Moussa Gomina; Redouane Moussa. 2021. "Reusing Geopolymer Waste from Matrices Based on Metakaolin or Fly Ash for the Manufacture of New Binder Geopolymeric Matrices." Sustainability 13, no. 14: 8070.

Journal article
Published: 31 August 2020 in Construction and Building Materials
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Alkali-activation and the combination of slag and fly ash are expected to improve the chemical stability of grouts designed for underground works. Sodium silicate activated grout mixtures have been designed with a liquid activator volume fraction of 75%. As the data related to such high water-to-solid ratios are scarce, a comprehensive study has been designed in order to determine the phase composition of these grouts and thus understand the influence of fly ash proportion on engineering properties of grouts at both fresh and hardened states. The reactivity at early-age is mainly provided by slag with a drop in strength from 60% of fly ash. Nuclear magnetic resonance (NMR), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) have been used to investigate the phase assemblage at long term (700 days). The alkali-activation of slag mainly produces a calcium silicate hydrate substituted with aluminum (C-A-S-H). From 20% of fly ash the C-A-S-H phase coexists with sodium aluminosilicate gel N-A-S-H, predominant from 60% of fly ash.

ACS Style

Abdelilah Aboulayt; Faten Souayfan; Emmanuel Roziere; Reda Jaafri; Anass Cherki El Idrissi; Redouane Moussa; Christophe Justino; Ahmed Loukili. Alkali-activated grouts based on slag-fly ash mixtures: From early-age characterization to long-term phase composition. Construction and Building Materials 2020, 260, 120510 .

AMA Style

Abdelilah Aboulayt, Faten Souayfan, Emmanuel Roziere, Reda Jaafri, Anass Cherki El Idrissi, Redouane Moussa, Christophe Justino, Ahmed Loukili. Alkali-activated grouts based on slag-fly ash mixtures: From early-age characterization to long-term phase composition. Construction and Building Materials. 2020; 260 ():120510.

Chicago/Turabian Style

Abdelilah Aboulayt; Faten Souayfan; Emmanuel Roziere; Reda Jaafri; Anass Cherki El Idrissi; Redouane Moussa; Christophe Justino; Ahmed Loukili. 2020. "Alkali-activated grouts based on slag-fly ash mixtures: From early-age characterization to long-term phase composition." Construction and Building Materials 260, no. : 120510.

Journal article
Published: 28 May 2020 in Materials Chemistry and Physics
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A geopolymeric material (referred as G0) was synthesized by reacting a silicate alkaline solution (mixture of sodium and potassium hydroxides with sodium silicate) with metakaolin. Various formulations (GC1 to GC12) have been synthesized by partially replacing kaolin with different contents of calcium carbonate. The thermal conductivity was evaluated from the density, specific heat capacity at constant pressure and thermal diffusivity (by flash method). The results revealed that these geopolymer formulations exhibit a good thermal stability at low temperature. In addition, the thermal conductivity increases when the test temperature is increased. Addition of calcite up to 12 wt% did not alter the thermal conductivity. The designed materials exhibit good combination of mechanical properties as well. In addition, the thermal performance of the developed material incorporated in an external wall and exposed to the real climatic conditions, was investigated. It was found that the wall made with developed geopolymer ensures a good reduction of surface temperature and heat flux as well as the heating and cooling demand compared to a wall without geopolymer.

ACS Style

Abdelilah Aboulayt; A. Gounni; M. El Alami; R. Hakkou; H. Hannache; M. Gomina; R. Moussa. Thermo-physical characterization of a metakaolin-based geopolymer incorporating calcium carbonate: A case study. Materials Chemistry and Physics 2020, 252, 123266 .

AMA Style

Abdelilah Aboulayt, A. Gounni, M. El Alami, R. Hakkou, H. Hannache, M. Gomina, R. Moussa. Thermo-physical characterization of a metakaolin-based geopolymer incorporating calcium carbonate: A case study. Materials Chemistry and Physics. 2020; 252 ():123266.

Chicago/Turabian Style

Abdelilah Aboulayt; A. Gounni; M. El Alami; R. Hakkou; H. Hannache; M. Gomina; R. Moussa. 2020. "Thermo-physical characterization of a metakaolin-based geopolymer incorporating calcium carbonate: A case study." Materials Chemistry and Physics 252, no. : 123266.

Journal article
Published: 26 March 2020 in Journal of Cleaner Production
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Yellow clays from Moroccan phosphate mines are extracted with other waste rocks lithologies and stored in large dumps within the mine site. The present paper investigates the use of this by-product as a new aluminosilicate source for geopolymers elaboration at the laboratory scale. Yellow clays studied are mainly composed of montmorillonite, dolomite and quartz as major phases. The Toxicity Characteristic Leaching Procedure (TCLP) showed no existence of contaminant. In order to reach thermal activation, the raw clays were first calcined at different temperatures between 500 and 900 °C. Raw and calcined clays were characterized using thermogravimetric analysis (TGA), X-Ray Diffraction (XRD) and Fourier transformed infrared (FTIR) spectroscopy. For the synthesis of geopolymers, calcined powder was mixed with an alkaline solution presenting different NaOH/Na2SiO3 ratios. The compressive strength was measured at 7, 14 and 28 days and material porosity was determined using Mercury Intrusion Porosimetry method in order to explain the mechanical behavior. XRD, 27Al and 29Si Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) spectroscopy, Fourier transformed infrared and TGA have been used to investigate the gel structure. The thermal treatment at 900 °C allowed the destruction of crystalline structure of montmorillonite clays, as well as the formation of new phases such as periclase (MgO) and gehlenite (Ca2Al2SiO7). Furthermore, the 27Al - 29Si MAS-NMR and the XRD analysis of the elaborated materials confirmed the formation of two cementitious gels C-A-S-H (Calcium aluminum silicate hydrate) and N-A-S-H (Sodium aluminum silicate hydrate). The compressive strength was around 25 MPa at 28 days. The obtained results are promising; they have shown that elaborated materials can be adapted for construction applications. In this case, it is recommended that economic and commercial study be developed.

ACS Style

S. Mabroum; Abdelilah Aboulayt; Y. Taha; M. Benzaazoua; N. Semlal; R. Hakkou. Elaboration of geopolymers based on clays by-products from phosphate mines for construction applications. Journal of Cleaner Production 2020, 261, 121317 .

AMA Style

S. Mabroum, Abdelilah Aboulayt, Y. Taha, M. Benzaazoua, N. Semlal, R. Hakkou. Elaboration of geopolymers based on clays by-products from phosphate mines for construction applications. Journal of Cleaner Production. 2020; 261 ():121317.

Chicago/Turabian Style

S. Mabroum; Abdelilah Aboulayt; Y. Taha; M. Benzaazoua; N. Semlal; R. Hakkou. 2020. "Elaboration of geopolymers based on clays by-products from phosphate mines for construction applications." Journal of Cleaner Production 261, no. : 121317.

Journal article
Published: 19 March 2019 in Cement and Concrete Research
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This paper presents the influence of natural hydraulic lime (NHL) on the behavior of cement-based materials at fresh and hardened states. Two reference mortars with and without limestone filler (LF) and with water-to-cement ratio of 0.6 were considered. For each reference mixture, cement was replaced by NHL with increasing mass proportions of 12.5%, 25% and 50%, while maintaining a constant paste volume. The freshly mixed pastes and mortars were tested for rheology, hydration process and setting properties. Moreover, plastic and drying shrinkage and compressive strength were also measured. The methodology shows that the substitution of cement by NHL affects the rheological behavior and the compressive strength, but improves the homogeneity of the mixtures. The incorporation of NHL also generated an expansion period resulting in a significant decrease in plastic shrinkage, and mitigated long-term drying shrinkage. The effects of substitution of cement by NHL during fresh and hardened states are presented along with the analysis of underlying mechanisms. The findings of this paper highlight the benefits of using NHL to optimize mortars' mix-design in terms of workability, mechanical properties and delayed behavior.

ACS Style

R. Jaafri; A. Aboulayt; Syed Yasir Alam; E. Roziere; A. Loukili. Natural hydraulic lime for blended cement mortars: Behavior from fresh to hardened states. Cement and Concrete Research 2019, 120, 52 -65.

AMA Style

R. Jaafri, A. Aboulayt, Syed Yasir Alam, E. Roziere, A. Loukili. Natural hydraulic lime for blended cement mortars: Behavior from fresh to hardened states. Cement and Concrete Research. 2019; 120 ():52-65.

Chicago/Turabian Style

R. Jaafri; A. Aboulayt; Syed Yasir Alam; E. Roziere; A. Loukili. 2019. "Natural hydraulic lime for blended cement mortars: Behavior from fresh to hardened states." Cement and Concrete Research 120, no. : 52-65.

Journal article
Published: 01 August 2018 in Construction and Building Materials
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The evolution of technical and environmental requirements fosters the development of geopolymer based grouts for soil reinforcement. Geopolymer based materials actually have several advantages but the improvement of their rheological performances remains a challenging task, as the raw materials, especially sodium silicate and metakaolin, do not have favorable properties and the main chemical admixtures used to optimize cement-based materials have not been found compatible. As mix-design takes into account the performances in both fresh and hardened states, a comprehensive study is necessary to develop geopolymer grouts based on metakaolin-fly ash-stabilizer mixtures. Fly ash allowed reducing the viscosity and increasing the setting time and the stabilizer provided the fresh mixes with better homogeneity and stability. At constant liquid to solid ratio, the packing density of the powders actually increases with fly ash proportion. Fly ash affected the mechanical properties, especially at replacement rates of 40% and higher, due to combined effects of reduced reactivity and higher packing density of the powders. This could be shown by a new methodology combining the monitoring the elastic properties with isothermal calorimetry for understanding the early-age behavior and the distinction between the geopolymerization stages. The addition of xanthan gum had a beneficial effect on the stability of grouts, by acting on the activation solution without having any significant effect on the geopolymerization reaction.

ACS Style

Abdelilah Aboulayt; Reda Jaafri; Hamza Samouh; Anass Cherki El Idrissi; Emmanuel Roziere; Redouane Moussa; Ahmed Loukili. Stability of a new geopolymer grout: Rheological and mechanical performances of metakaolin-fly ash binary mixtures. Construction and Building Materials 2018, 181, 420 -436.

AMA Style

Abdelilah Aboulayt, Reda Jaafri, Hamza Samouh, Anass Cherki El Idrissi, Emmanuel Roziere, Redouane Moussa, Ahmed Loukili. Stability of a new geopolymer grout: Rheological and mechanical performances of metakaolin-fly ash binary mixtures. Construction and Building Materials. 2018; 181 ():420-436.

Chicago/Turabian Style

Abdelilah Aboulayt; Reda Jaafri; Hamza Samouh; Anass Cherki El Idrissi; Emmanuel Roziere; Redouane Moussa; Ahmed Loukili. 2018. "Stability of a new geopolymer grout: Rheological and mechanical performances of metakaolin-fly ash binary mixtures." Construction and Building Materials 181, no. : 420-436.

Journal article
Published: 01 September 2017 in Advanced Powder Technology
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ACS Style

Abdelilah Aboulayt; Mehdi Riahi; M. Ouazzani Touhami; H. Hannache; M. Gomina; R. Moussa. Properties of metakaolin based geopolymer incorporating calcium carbonate. Advanced Powder Technology 2017, 28, 2393 -2401.

AMA Style

Abdelilah Aboulayt, Mehdi Riahi, M. Ouazzani Touhami, H. Hannache, M. Gomina, R. Moussa. Properties of metakaolin based geopolymer incorporating calcium carbonate. Advanced Powder Technology. 2017; 28 (9):2393-2401.

Chicago/Turabian Style

Abdelilah Aboulayt; Mehdi Riahi; M. Ouazzani Touhami; H. Hannache; M. Gomina; R. Moussa. 2017. "Properties of metakaolin based geopolymer incorporating calcium carbonate." Advanced Powder Technology 28, no. 9: 2393-2401.

Conference paper
Published: 09 September 2013 in MATEC Web of Conferences
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ACS Style

A. El Bouari; R. El Ouatib; H. Hannache; S. Krimi; M. Lamire; I. Mansouri; R. Moussa; A. Aboulayt. Foreword. MATEC Web of Conferences 2013, 5, 00005 .

AMA Style

A. El Bouari, R. El Ouatib, H. Hannache, S. Krimi, M. Lamire, I. Mansouri, R. Moussa, A. Aboulayt. Foreword. MATEC Web of Conferences. 2013; 5 ():00005.

Chicago/Turabian Style

A. El Bouari; R. El Ouatib; H. Hannache; S. Krimi; M. Lamire; I. Mansouri; R. Moussa; A. Aboulayt. 2013. "Foreword." MATEC Web of Conferences 5, no. : 00005.