Abstract: To improve the early properties of potassium magnesium phosphate cement (MKPC) paste and make full use of so-lid waste micro-powder, the influencing law of different content of fly ash, steel slag and nickel slag micro-powder on the hydration temperature, compressive strength and volume deformation of magnesium potassium phosphate cement paste at early stage (Normal temperature curing for 24 h) were investigated by a combination of macro-performance testing and microstructure analysis. The results showed that the peak temperature of the first hydration temperature in the composite MKPC paste with three kinds of solid waste micro-powders reduce 3 ℃ to 10 ℃, and among them, the blending effect of steel slag was significant and it maked the first peak time of composite MKPC paste postpone more than 30 minutes. Considering the maximum utilization rate of the solid waste and the reference standards on the rapid repair material requiring the strength not less than 42.5 MPa with one day, the suitable dosage of fly ash, steel slag and nickel slag micro-powder was 20%,30% and 30%, respectively; the volumetric expansion rate of the compo-site MKPC hardened body was higher than that of the control group at one day. In addition, the microstructure of MKPC hardened paste containing suitable amount of solid waste micro-powder showed that the number increased, grain size becoming smaller and morphology changed of the crystal, and the structure accumulation was also obviously dense.
张洁, 张建建, 孙国文, 杨建明, 汤青青. 三种固废微粉对磷酸钾镁水泥浆体早期性能影响及作用机理[J]. 材料导报, 2018, 32(20): 3553-3561.
ZHANG Jie, ZHANG Jianjian, SUN Guowen, YANG Jianming, TANG Qingqing. Effects of Three Kinds of Solid Waste Micro-powder on the Early Properties and Action Mechanism for Magnesium Potassium Phosphate Cement Paste. Materials Reports, 2018, 32(20): 3553-3561.
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