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Eva Kuzielová
Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-812 37 Bratislava, Slovakia

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Journal article
Published: 24 May 2021 in Materials
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Two substitution levels of Portland cement by silica fume (SF; 30 and 50 mass%) and three hydrothermal treatment regimes (0.5, 1.2, and 2 MPa and 165, 195, and 220 °C for 7 days, respectively) were selected for the investigation of high-temperature phase formation. A combination of thermogravimetric, X-ray diffraction, and Fourier transform infrared analyses in the mid-IR region was used to overcome the shortcomings of individual techniques for the identification of these complex systems. Changes in molecular water amounts, the polymerization degree of silicate chains, or their decomposition due to transformations and crystallization of phases at hydrothermal conditions were observed and discussed concerning composition. Contrary to the calciochondrite, hydrogrossular phases, α-C2SH, and jaffeite detected in the systems without SF, a decrease in CaO/SiO2 ratio resulted in the formation of stable tobermorite in the case of 30 mass% SF, whilst calcium hydrogen silicate, gyrolite, and cowlesite were identified as more thermally stable phases in the samples with 50 mass% SF.

ACS Style

Eva Kuzielová; Michal Slaný; Matúš Žemlička; Jiří Másilko; Martin Palou. Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA. Materials 2021, 14, 2786 .

AMA Style

Eva Kuzielová, Michal Slaný, Matúš Žemlička, Jiří Másilko, Martin Palou. Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA. Materials. 2021; 14 (11):2786.

Chicago/Turabian Style

Eva Kuzielová; Michal Slaný; Matúš Žemlička; Jiří Másilko; Martin Palou. 2021. "Phase Composition of Silica Fume—Portland Cement Systems Formed under Hydrothermal Curing Evaluated by FTIR, XRD, and TGA." Materials 14, no. 11: 2786.

Journal article
Published: 18 November 2020 in Materials
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Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. Zinc is one of these elements. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO3)2 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05%, 0.1%, 0.5% and 1% of cement weight. The effect of zinc on hydration was monitored by isothermal and isoperibolic calorimetry. A 15% addition of fly ash to cement mainly causes further retardation of hydration reactions due to the reactions of fly ash particles with Ca2+ ions from cement. The strongest effect on the hydration retardation from all investigated compounds showed in ZnO as it dissolves very slowly. On the contrary, for the dosage of 1% of zinc in the form of ZnCl2 significant acceleration of hydration occurred. In this work, a synergistic effect on the prolongation of hydration with a combination of cement, zinc and fly ash was demonstrated. The lengths of induction periods were assessed from detected calorimetric curves and from these lengths the curves were gained by fitting with the exponential function. Final products were next analyzed using X-ray diffraction.

ACS Style

Pavel Šiler; Iva Kolářová; Radoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; František Šoukal. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. Materials 2020, 13, 5215 .

AMA Style

Pavel Šiler, Iva Kolářová, Radoslav Novotný, Jiří Másilko, Jan Bednárek, Martin Janča, Jan Koplík, Jan Hajzler, Lukáš Matějka, Michal Marko, Jiří Švec, Martin Zlámal, Eva Kuzielová, Tomáš Opravil, František Šoukal. Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. Materials. 2020; 13 (22):5215.

Chicago/Turabian Style

Pavel Šiler; Iva Kolářová; Radoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; František Šoukal. 2020. "Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash." Materials 13, no. 22: 5215.

Preprint
Published: 12 October 2020
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Increasing utilization of secondary raw materials and alternative fuels results in increasing contents of metals in cements. One of elements, the content of which keeps rising in cement is zinc. It comes to cement with secondary raw materials such as slag or fly ash or by the utilization of used tires as an alternative fuel. Zinc ions significantly prolong the hydration process in cement. This work deals with the influence of zinc ions in the form of very poorly soluble ZnO salt and easily soluble ZnCl2 and Zn(NO)3 on the hydration of cement blended with fly ash. Zinc was dosed in the range of 0.05, 0.1, 0.5 a 1% of cement weight. Final products were next analyzed using X-Ray Diffraction.

ACS Style

Pavel Šiler; Iva Kolářová; Rdoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; Frantisek Soukal. Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. 2020, 1 .

AMA Style

Pavel Šiler, Iva Kolářová, Rdoslav Novotný, Jiří Másilko, Jan Bednárek, Martin Janča, Jan Koplík, Jan Hajzler, Lukáš Matějka, Michal Marko, Jiří Švec, Martin Zlámal, Eva Kuzielová, Tomáš Opravil, Frantisek Soukal. Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash. . 2020; ():1.

Chicago/Turabian Style

Pavel Šiler; Iva Kolářová; Rdoslav Novotný; Jiří Másilko; Jan Bednárek; Martin Janča; Jan Koplík; Jan Hajzler; Lukáš Matějka; Michal Marko; Jiří Švec; Martin Zlámal; Eva Kuzielová; Tomáš Opravil; Frantisek Soukal. 2020. "Possibilities of Use of Isothermal and Isoperibolic Calorimetry to Study the Effect of Zinc on Hydration of Cement Blended with Fly Ash." , no. : 1.

Article
Published: 15 May 2020 in Journal of Thermal Analysis and Calorimetry
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Analcime was prepared by hydrothermal transformation of metakaolin-based geopolymer activated by means of sodium water glass. Gradual transformation of geopolymer through primary and unstable zeolitic phases up to final analcime was studied as a function of hydrothermal treatment duration (6–48 h) and access of water vapour under the selected conditions (165 °C, 0.5 MPa). Composition, microstructure, and thermal stability of the prepared samples were assessed using simultaneous thermogravimetry and differential scanning calorimetry, X-ray diffraction and high-temperature XRD analyses, and scanning electron microscopy. In the case of shorter autoclaving and access of water vapour, the mix of different zeolitic phases was formed: analcime, zeolite P2 gmelinite-Na, and chabazite-Na. From the time of 24 h and autoclaving in the closed moulds, pure cubic analcime was detected. Uniform microstructure of these samples comprised of trapezoid particles with the diameter between 50 and 60 µm. Prolongation of autoclaving time did not lead to the significant change of particle size and their composition. Dehydration of detected zeolites took place through the formation of defect or unknown zeolitic structures before the structural collapse happened.

ACS Style

Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Pavol Hudec; Martin T. Palou. Influence of hydrothermal treatment parameters on the phase composition of zeolites. Journal of Thermal Analysis and Calorimetry 2020, 142, 37 -50.

AMA Style

Eva Kuzielová, Matúš Žemlička, Jiří Másilko, Pavol Hudec, Martin T. Palou. Influence of hydrothermal treatment parameters on the phase composition of zeolites. Journal of Thermal Analysis and Calorimetry. 2020; 142 (1):37-50.

Chicago/Turabian Style

Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Pavol Hudec; Martin T. Palou. 2020. "Influence of hydrothermal treatment parameters on the phase composition of zeolites." Journal of Thermal Analysis and Calorimetry 142, no. 1: 37-50.

Article
Published: 17 March 2020 in Journal of Thermal Analysis and Calorimetry
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Two Portland cement (PC) replacement levels (35, 45 mass%) and three locally available supplementary cementitious materials (SCMs; metakaolin (MK, 5–15 mass%), silica fume (SF, 5, 10 mass%), ground granulated blast-furnace slag (BFS, 10–35 mass%)) in different ratios were used for the preparation of multicomponent binders, the hydration of which was studied up to 365 days by means of thermal analysis. The suitable compositions were found for both PC replacement levels. In the case of the lower one as well as in the compositions prepared with higher SF amount, 20 mass% of BFS appeared as beneficial. When lower amounts of SF and cement were used, samples with larger quantity of BFS reached better results. Concerning compressive strength (CS), synergic influence of SCMs overcame the dilution effect already after 28 days of curing and no significant dependence on the PC content was determined. Later, the majority of the blended samples reached higher CSs than the corresponding referential ones. With respect to the coefficient of pozzolanic activity, the combination of higher SF level (10 mass%) mainly with higher amount of BFS seemed to be more desirable in general.

ACS Style

Eva Kuzielová; Matúš Žemlička; Martin Janča; Pavel Šiler; Martin T. Palou. Later stages of Portland cement hydration influenced by different portions of silica fume, metakaolin and ground granulated blast-furnace slag. Journal of Thermal Analysis and Calorimetry 2020, 142, 339 -348.

AMA Style

Eva Kuzielová, Matúš Žemlička, Martin Janča, Pavel Šiler, Martin T. Palou. Later stages of Portland cement hydration influenced by different portions of silica fume, metakaolin and ground granulated blast-furnace slag. Journal of Thermal Analysis and Calorimetry. 2020; 142 (1):339-348.

Chicago/Turabian Style

Eva Kuzielová; Matúš Žemlička; Martin Janča; Pavel Šiler; Martin T. Palou. 2020. "Later stages of Portland cement hydration influenced by different portions of silica fume, metakaolin and ground granulated blast-furnace slag." Journal of Thermal Analysis and Calorimetry 142, no. 1: 339-348.

Article
Published: 17 March 2020 in Journal of Thermal Analysis and Calorimetry
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The present work investigates the hydration heat of different cement composites by means of conduction calorimetry to optimize the composition of binder in the design of heavyweight concrete as biological shielding. For this purpose, Portland cement CEM I 42.5 R was replaced by a different portion of supplementary cementitious materials (blast furnace slag, metakaolin, silica fume/limestone) at 75%, 65%, 60%, 55%, and 50% levels to obtain low hydration heat lower than 250 j g−1. All ingredients were analyzed by energy dispersive X-ray fluorescence (EDXRF) and nuclear activation analysis (NAA) to assess the content of major elements and isotopes. A mixture of two high-density aggregates (barite and magnetite) was used to prepare three heavyweights concretes with compressive strength exceeding 45 MPa and bulk density ranging between 3400 and 3500 kg m−3. After a short period of volume expansion (up to 4 h), a slight shrinkage (max. 0.3°/°°) has been observed. Also, thermophysical properties (thermal conductivity, volumetric specific heat, thermal diffusivity) and other properties were determined. The results showed that aggregate content and not binder is the main factor influencing the engineering properties of heavyweight concretes.

ACS Style

Janette Dragomirová; Martin T. Palou; Eva Kuzielová; Matúš Žemlička; Radoslav Novotný; Katalin Gméling. Optimization of cementitious composite for heavyweight concrete preparation using conduction calorimetry. Journal of Thermal Analysis and Calorimetry 2020, 142, 255 -266.

AMA Style

Janette Dragomirová, Martin T. Palou, Eva Kuzielová, Matúš Žemlička, Radoslav Novotný, Katalin Gméling. Optimization of cementitious composite for heavyweight concrete preparation using conduction calorimetry. Journal of Thermal Analysis and Calorimetry. 2020; 142 (1):255-266.

Chicago/Turabian Style

Janette Dragomirová; Martin T. Palou; Eva Kuzielová; Matúš Žemlička; Radoslav Novotný; Katalin Gméling. 2020. "Optimization of cementitious composite for heavyweight concrete preparation using conduction calorimetry." Journal of Thermal Analysis and Calorimetry 142, no. 1: 255-266.

Article
Published: 27 January 2020 in Journal of Thermal Analysis and Calorimetry
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The present paper focuses on the suitability, variability and versatility of thermal analysis and calorimetry methods in the study of cement hydration as physical and chemical process including pozzolanicity and hydraulicity of supplementary cementitious materials. Isothermal calorimeter TAM AIR and simultaneous TGA/DSC were used. Not only activation energy of system comprising SCMs, but also heat generated through alkali-activated reaction of metakaolin and ground granulated blast furnace slag (BFS) can be successfully determined by using conduction calorimetry. The incremental heat flow and incremental cumulative heat of the alkali-activated reaction of ground granulated BFS and metakaolin (MK) were determined and found dependent on temperature and mass ratio between cement and SCMs. The incremental heat flow presents the same characteristics as parent heat flow with different peaks, denoting the formation of C–S–H, ettringite and C–A–S–H trough alkali-activated reaction. While BFS and MK influenced moderately the formation of C–S–H, their influence on the formation of C–A–\({\bar{\text{S}}}\)–H (ettringite and monosulphate) and C–A–S–H is significant as evidenced by peak position and intensity. The method of calorimetry coupled with thermal analysis was considered sufficient to assess the pozzolanicity and hydraulicity of SCMs.

ACS Style

Martin Palou; Martin Boháč; Eva Kuzielová; Radoslav Novotný; Matúš Žemlička; Janette Dragomirová. Use of calorimetry and thermal analysis to assess the heat of supplementary cementitious materials during the hydration of composite cementitious binders. Journal of Thermal Analysis and Calorimetry 2020, 142, 97 -117.

AMA Style

Martin Palou, Martin Boháč, Eva Kuzielová, Radoslav Novotný, Matúš Žemlička, Janette Dragomirová. Use of calorimetry and thermal analysis to assess the heat of supplementary cementitious materials during the hydration of composite cementitious binders. Journal of Thermal Analysis and Calorimetry. 2020; 142 (1):97-117.

Chicago/Turabian Style

Martin Palou; Martin Boháč; Eva Kuzielová; Radoslav Novotný; Matúš Žemlička; Janette Dragomirová. 2020. "Use of calorimetry and thermal analysis to assess the heat of supplementary cementitious materials during the hydration of composite cementitious binders." Journal of Thermal Analysis and Calorimetry 142, no. 1: 97-117.

Article
Published: 09 May 2019 in Journal of Thermal Analysis and Calorimetry
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Present study deals with the influence of metakaolin (MK), silica fume (SF) and ground granulated blast-furnace slag (BFS) on middle hydration of ordinary Portland cement replaced by 45 mass% of particular supplementary cementitious materials (SCMs). Acceleration of cement hydration by SF and MK was proved up to the first 12 h by isothermal calorimetry as well as by thermogravimetric analyses. From the beginning of deceleratory period, when SCMs stopped to act as accelerators, more evident influence of the dilution effect was observed. Nevertheless, the presence of pozzolanic reactions was demonstrated already after 15 h of curing and even when SF and MK were used in the amount equal to 5 mass%. Synergic effect of the used SCMs allowed to increase the quantity of BFS up to 35 mass% without significant changes in their positive action.

ACS Style

Eva Kuzielová; Matúš Žemlička; Radoslav Novotný; Martin T. Palou. Middle stage of Portland cement hydration influenced by different portions of silica fume, metakaolin and ground granulated blast-furnace slag. Journal of Thermal Analysis and Calorimetry 2019, 138, 4119 -4126.

AMA Style

Eva Kuzielová, Matúš Žemlička, Radoslav Novotný, Martin T. Palou. Middle stage of Portland cement hydration influenced by different portions of silica fume, metakaolin and ground granulated blast-furnace slag. Journal of Thermal Analysis and Calorimetry. 2019; 138 (6):4119-4126.

Chicago/Turabian Style

Eva Kuzielová; Matúš Žemlička; Radoslav Novotný; Martin T. Palou. 2019. "Middle stage of Portland cement hydration influenced by different portions of silica fume, metakaolin and ground granulated blast-furnace slag." Journal of Thermal Analysis and Calorimetry 138, no. 6: 4119-4126.

Journal article
Published: 16 March 2019 in Geothermics
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Dyckerhoff cement was substituted by 15 mass% of silica fume (SF), metakaolin (MK), ground granulated blast-furnace slag (BFS) or their combination. Phase changes and their impact on porous structure and compressive strength were investigated from 7 up to 28 days of hydrothermal curing at 165 °C and 0.6 MPa. Since the amount of jaffeite did not change significantly with prolongation of autoclaving time, ongoing coarsening of structure resulting in substantial increase of permeability coefficient and decrease of compressive strength depended mainly on the increasing quantity of α-C2SH. The most significant negative changes were demonstrated in referential samples as well as samples containing BFS. Any of the undesired phases were evidenced in the composition prepared with SF. Particular samples showed character of structure and compressive strength comparable or even better than corresponding samples cured under standard conditions.

ACS Style

Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Martin T. Palou. Development of G-oil well cement phase composition during long therm hydrothermal curing. Geothermics 2019, 80, 129 -137.

AMA Style

Eva Kuzielová, Matúš Žemlička, Jiří Másilko, Martin T. Palou. Development of G-oil well cement phase composition during long therm hydrothermal curing. Geothermics. 2019; 80 ():129-137.

Chicago/Turabian Style

Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Martin T. Palou. 2019. "Development of G-oil well cement phase composition during long therm hydrothermal curing." Geothermics 80, no. : 129-137.

Article
Published: 22 October 2018 in Journal of Thermal Analysis and Calorimetry
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Portland cement was partially replaced by metakaolin (MK), silica fume (SF) and ground granulated blast-furnace slag (BFS). Globally, two amounts of SF (5 and 10 mass%) and total substitution level of 35 mass% were used to prepare blended samples. Their early and 28 days hydration was studied by means of isothermal calorimetry and thermal analysis. Developed phase composition was assessed using compressive strength measurements. Acceleration of cement hydration in early times was proved and reflected higher amounts of finer additives. Despite dilution effect, the presence of more reactive SF and MK resulted in pozzolanic reactions manifesting already before 2 days of curing and contributing to the formation of strength possessing phases. The influence of BFS addition showed later and thanks to the synergic effect of all the used additives; it was possible to increase its content up to 25 mass% by keeping the compressive strength values near that of referential one.

ACS Style

Eva Kuzielová; Matúš Žemlička; Radoslav Novotný; Martin T. Palou. Simultaneous effect of silica fume, metakaolin and ground granulated blast-furnace slag on the hydration of multicomponent cementitious binders. Journal of Thermal Analysis and Calorimetry 2018, 136, 1527 -1537.

AMA Style

Eva Kuzielová, Matúš Žemlička, Radoslav Novotný, Martin T. Palou. Simultaneous effect of silica fume, metakaolin and ground granulated blast-furnace slag on the hydration of multicomponent cementitious binders. Journal of Thermal Analysis and Calorimetry. 2018; 136 (4):1527-1537.

Chicago/Turabian Style

Eva Kuzielová; Matúš Žemlička; Radoslav Novotný; Martin T. Palou. 2018. "Simultaneous effect of silica fume, metakaolin and ground granulated blast-furnace slag on the hydration of multicomponent cementitious binders." Journal of Thermal Analysis and Calorimetry 136, no. 4: 1527-1537.

Article
Published: 07 November 2017 in Journal of Thermal Analysis and Calorimetry
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Stability of Dyckerhoff cement Class G partially substituted (15 mass%) by metakaolin (MK), silica fume (SF) and ground granulated blast-furnace slag (BFS) was investigated after 7 days of curing under standard and two different autoclaving conditions. Mercury intrusion porosimetry, X-ray diffraction analysis and combined thermogravimetric–differential scanning calorimetry were used to evaluate pore structure development, compressive strength and their dependence on the type of additives in relation to the particular phase composition. Hydrothermal curing led to the formation of α-C2SH and jaffeite, mostly in the case of referential samples and compositions with addition of slowly reacting BFS. Whilst modest hydrothermal curing (0.6 MPa, 165 °C) favoured formation of α-C2SH, larger amounts of jaffeite were determined after curing at the highest used pressure and temperature (2.0 MPa, 220 °C). Undesired transformation of primary hydration products was prevented especially by addition of highly reactive and very fine SF. Particular composition attained the best pore structure characteristics and compressive strength after curing at 0.6 MPa and 165 °C. Formation of more stable phases with C/S ratio close to 1 was proved by wollastonite formation during DSC analyses. More severe conditions of curing, however, led to the significant deterioration of microstructure and strength of corresponding sample, probably due to the formation of trabzonite, killalaite and zoisite. Considering the values of hydraulic permeability coefficient and compressive strength, replacement of cement by MK improved significantly the properties of cement when compared with the referential as well as with other blended compositions under the mentioned curing conditions.

ACS Style

Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Martin T. Palou. Effect of additives on the performance of Dyckerhoff cement, Class G, submitted to simulated hydrothermal curing. Journal of Thermal Analysis and Calorimetry 2017, 133, 63 -76.

AMA Style

Eva Kuzielová, Matúš Žemlička, Jiří Másilko, Martin T. Palou. Effect of additives on the performance of Dyckerhoff cement, Class G, submitted to simulated hydrothermal curing. Journal of Thermal Analysis and Calorimetry. 2017; 133 (1):63-76.

Chicago/Turabian Style

Eva Kuzielová; Matúš Žemlička; Jiří Másilko; Martin T. Palou. 2017. "Effect of additives on the performance of Dyckerhoff cement, Class G, submitted to simulated hydrothermal curing." Journal of Thermal Analysis and Calorimetry 133, no. 1: 63-76.