ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 65, (2) 132 - 140 (2021)

Jiang Xinghan 1, Zhou Jiaqi 1, Wu Chengyou 2,1, Kou Xihu 1, Liu Panpan 1
1 School of Civil Engineering, Qinghai University, Xining 810016, PR China
2 Key Laboratory of Building Energy-saving Materials and Engineering Safety of Qinghai Province, Xining 810016, PR China

Keywords: Nanomaterial, Compressive strength, Microstructure, Hydration heat release, Water resistance

In this work, to study the effects of different contents of nano-CaCO₃ on the hydration characteristics of a basic magnesium sulfate cement (BMSC), the mechanical properties and water resistance of the BMSC paste were analysed via compressive strength tests and long-term immersion tests. The effect of nano-CaCO₃ on the hydration of the BMSC was studied via X-ray diffraction, scanning electron microscopy, and a hydration exothermic curve analysis. The results showed that the early strength and water resistance of the BMSC paste can be improved by different dosages of nano-CaCO₃, and the optimum dosage was found to be 3%. Moreover, the addition of nano-CaCO₃ will not affect the setting and hardening time of the BMSC, nor will it change the phase composition and micromorphology of the BMSC.

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doi: 10.13168/cs.2021.0012
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