Effect of Composite Hydrated Salt on Hydration and Properties of Magnesium Phosphate Cement
ZHAO Sixie1, YAN Hua1, WANG Hongtao1, LI Yuntao1, DAI Fengle1, XUE Ming2, HU Zhide1
1 Department of Chemical and Material Engineering, Logistical Engineering University, Chongqing 401311; 2 Department of Architecture and Environment Engineering, Logistical Engineering University, Chongqing 401311
Abstract: According to optimal proportion(1.5∶7∶1.5, mass ratio), composite hydrated salt(FH) was prepared by blending three categories of hydrated salt Na2B4O7·10H2O, Na2SO4·10H2O and Ca(NO3)2·4H2O. Work performance, hydration temperature and compressive strength of magnesium potassium phosphate cement(MKPC) mixed with borax NB10 and mixed with different content of FH(FH-MKPC) were compared. Combining hydration heat evolution curve, influence of FH on early hydration of MKPC was investigated by XRD, TG-DSC and SEM microcosmic analysis methods. The result showed FH slowed down the hydration of MKPC, which made hydration temperature rise curve have induction and two temperature peak, and diminished hydration heat evolution rate and hydration temperature peak value. The addition of FH(>8%) prolonged setting time of MKPC largely, enhancing construction operability. With the content of FH increase, setting time of MKPC prolonged, fluidity increased and early compressive strength decreased. Initial setting time of FH-MKPC mixed with 8% FH could reach 25.20 min, prolonged 90.76%, compared with NB10. At the same time, amount and thermal stability of hydration products of early hydration stage of FH-MKPC was higher, 7 h, 1 d and 3 d compressive strength were also slightly higher than former. In order to meet the requirement of construction and strength, optimal content of FH was 8%.
赵思勰, 晏华, 汪宏涛, 李云涛, 戴丰乐, 薛明, 胡志德. 复合无机水合盐对磷酸镁水泥水化及性能的影响*[J]. 《材料导报》期刊社, 2017, 31(23): 156-162.
ZHAO Sixie, YAN Hua, WANG Hongtao, LI Yuntao, DAI Fengle, XUE Ming, HU Zhide. Effect of Composite Hydrated Salt on Hydration and Properties of Magnesium Phosphate Cement. Materials Reports, 2017, 31(23): 156-162.
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2017, Vol. 31 
