A study on mechanical properties and structure of anhydrite binder modified by ultra-dispersed siltstone
This research is devoted to modification of physical and mechanical properties and structure of a binder based on natural anhydrite. A sedimentary rock siltstone was added into the composition as a mineral ultrafine additive. The presence of aluminosilicate minerals proves that finely ground siltstone can be used as a mineral additive in the composition of the anhydrite binder, accelerating crystallization of gypsum new formations and densifying the structure of gypsum stone. For the first time, the effectiveness of using sodium and ammonium phosphates as hardening activators of an anhydrite binder was shown. Siltstone, added to the composition in the amount from 0 to 5%, lead to up to 40% increase in strength, which is due to the action of siltstone particles as “crystallization centers” and formation of crystalline hydrates of calcium sulfate dihydrate on their surface. Combined action of calcined siltstone and lime leads to a 45% increase in strength due to the additional compaction by new hydration products formed in the course of metakaolin and lime interaction. Microstructural analysis showed that samples with calcined siltstone and lime have a more dense and uniform structure with a lower porosity, compared to those with only natural siltstone.
First published online 03 February 2020
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Conley, R. F., & Bundy, W. M. (1958). Mechanism of gypsification. Geochimica at Cosmochimia Acta, 15(1–2), 57–72. https://doi.org/10.1016/0016-7037(58)90010-3
Chen, H., Soles, J. A., & Malhotra, V. M. (1993). Investigations of supplementary cementing materials for reducing alkali-aggregate reactions. Cement and Concrete Composites, 15(1–2), 75–84. https://doi.org/10.1016/0958-9465(93)90039-C
Escalante-García, J. I., Martínez-Aguilar, O. A., & Gomez-Zamorano, L. Y. (2017). Calcium sulphate anhydrite based composite binders; effect of Portland cement and four pozzolans on the hydration and strength. Cement and Concrete Composites, 82, 227–233. https://doi.org/10.1016/j.cemconcomp.2017.05.012
Fomina, E. V., Lesovik, V. S., Fomin, A. E., Absimetov, M. V., & Elistratkin, M. Yu. (2018). Increasing the effectiveness of aerated concrete by using coal waste. Regional’naya arkhitektura i stroitel’stvo, 4(37), 38–47. (In Russian).
Habert, G., Choupay, N., Escadeillas, G., Guillaume, D., & Montel, J. M. (2009). Clay content of argillites: Influence on cement based mortars. Applied Clay Science, 43(3–4), 322–330. https://doi.org/10.1016/j.clay.2008.09.009
Juenger, M. C. G., Snellings, R., & Bernal, S. A. (2019). Supplementary cementitious materials: New sources, characterization, and performance insights. Cement and Concrete Research, 122, 257–273. https://doi.org/10.1016/j.cemconres.2019.05.008
Kondratieva, N., Barre, M., Goutenoire, F., & Sanytsky, M. (2017). Study of modified gypsum binder. Construction and Building Materials, 149, 535–542. https://doi.org/10.1016/j.conbuildmat.2017.05.140
Konovalov, V. M., Glikin, D. M., & Solomatova, S. S. (2015). The use of argillite in the production of mixed cements. Sovremennyye problemy nauki i obrazovaniya, 2(2), p. 96. (In Russian).
Krejsová, J., Doleželová, M., Pernicová, R., Svora P., & Vimmrová, A. (2018). The influence of different aggregates on the behavior and properties of gypsum mortars, Cement and Concrete Composites, 92, 188–197. https://doi.org/10.1016/j.cemconcomp.2018.06.007
Magallanes-Rivera, R. X., Juarez-Alvarado, C. A., Valdez, P., & Mendoza-Rangel, J. M. (2012). Modified gypsum compounds: An ecological–economical choice to improve traditional plasters. Construction and Building Materials, 37, 591–596. https://doi.org/10.1016/j.conbuildmat.2012.07.054
Magallanes-Rivera, R. X., & Escalante-García, J. I. (2014). Anhydrite/hemihydrate-blast furnace slag cementitious composites: Strength development and reactivity. Construction and Building Materials, 65, 20–28. https://doi.org/10.1016/j.conbuildmat.2014.04.056
Sakthieswaran, N., & Sophia, M. (2019). Synergistic effect of mineral admixture and bio-carbonate fillers on the physicomechanical properties of gypsum plaster. Construction and Building Materials, 204, 419–439. https://doi.org/10.1016/j.conbuildmat.2019.01.160
Sakthieswaran, N., & Sophia, M. (2018). Effect of superplasticizers on the properties of latex modified gypsum plaster. Construction and Building Materials, 179, 675–691. https://doi.org/10.1016/j.conbuildmat.2018.05.150
Sergeeva, N. A., & Sycheva, L. I. (2017). The effect of additives on the properties of anhydrite binder. Uspekhi v khimii i khimicheskoy tekhnologii, 32(2–198), 158–160. (In Russian).
Sergeeva, N. A., & Sycheva, L. I. (2017). The influence of the structure of the anhydrite component on the properties of multiphase gypsum binders. Uspekhi v khimii i khimicheskoy tekhnologii, 31(3–184), 102–104. (In Russian).
Singh, M., & Garg, M. (2000). Making of anhydrite cement from waste gypsum. Cement and Concrete Research, 30(4), 571–577. https://doi.org/10.1016/S0008-8846(00)00209-X
Singh, M., & Garg, M. (2004). Study on anhydrite plaster from waste phosphogypsum for use in polymerised flooring composition. Construction and Building Materials, 19(1), 25–29. https://doi.org/10.1016/j.conbuildmat.2004.04.038
Singh, N. B., & Middendorf, B. (2007). Calcium sulphate hemihydrate hydration leading to gypsum crystallization. Progress in Crystal Growth and Characterization of Materials, 53, 57–77. https://doi.org/10.1016/j.pcrysgrow.2007.01.002
Tzouvalas, G., Dermatas, N., & Tsimas, S. (2004). Alternative calcium sulfate-bearing materials as cement retarders: Part I. Anhydrite. Cement and Concrete Research, 34(11), 2113–2118. https://doi.org/10.1016/j.cemconres.2004.03.020
Wang, W., Zeng, D., Chen, Q., & Yin, X. (2013). Experimental determination and modeling of gypsum and insoluble anhydrite solubility in the system CaSO4–H2SO4–H2O. Chemical Engineering Science, 101, 120–129. https://doi.org/10.1016/j.ces.2013.06.023