Abstract: Too fast setting and hardening rate as well as concentrative hydration heat of magnesium potassium phosphate cements restrict its extensive engineering application seriously. Endothermic energy storage of phase change material offers a new way for solving the problems. Effect of inorganic phase change material Na2SO4· 10H2O(NS) on hydration temperature,work perfor-mances and compressive strength of magnesium potassium phosphate cement(MKPC) were investigated. Moreover, influence mechanism of NS on properties of MKPC were researched with the aids of XRD, FT-IR, SEM analyses and hydration heat release rate. The result showed that solution and phase change process of NS absorbed a multitude of hydration heat and released crystalliferous water, which attenuated solution rate and concentration of Mg2+, PO3-4 and H+ in system of MKPC. So rate of interior hydration of MKPC reaction diminished, causing prolonged setting time, increased fluidity, and mild hydration heat release and temperature rise. In early hydration process, with NS content increase, early strength of MKPC diminish slightly. Under a certain content of NS (≤ 4%), the crystallinity of hydration products increased, and the long-term strength of MKPC increased steadily. 28 d compressive strength of MKPC with 2% NS was higher than that of the reference group.
赵思勰, 晏华, 汪宏涛, 李云涛, 张寒松, 胡志德. Na2SO4·10H2O对磷酸钾镁水泥水化硬化的影响*[J]. 《材料导报》期刊社, 2017, 31(23): 187-192.
ZHAO Sixie, YAN Hua, WANG Hongtao, LI Yuntao, ZHANG Hansong, HU Zhide. Influence of Na2SO4·10H2O on Hydration and Hardening of Magnesium Potassium Phosphate Cement. Materials Reports, 2017, 31(23): 187-192.
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2017, Vol. 31 
