【摘要】 研究测试了不同高镁镍渣粉含量的磷酸钾镁水泥(MKPC)浆体的流动度、体积变形、水化温度和不同养护条件下的抗压强度,分析了MKPC浆体的物相组成和微观形貌。结果表明:适量磨细的高镁镍渣粉等量替代死烧氧化镁粉,可改善MKPC浆体的流动性,使MKPC硬化体的水稳定性明显改善,其中掺30%～40%高镁镍渣粉的MKPC试件的60 d水养护抗压强度剩余率超过100%。适量高镁镍渣粉可明显改善MKPC硬化体的收缩变形,其中含30%高镁镍渣粉的MKPC浆体水化60 d时的干燥收缩率仅为参考样的48.1%。上述改善作用缘于含高镁镍渣粉对碱组分粉体级配的改善作用,使MKPC浆体的初始水灰比较低,高镁镍渣粉中难磨粗颗粒的微集料作用和玻璃体的活性作用,使MKPC硬化体结构趋于致密。更多还原

【Abstract】 The fluidity, volume deformation, hydration temperature and compressive strength under different curing conditions of magnesium potassium phosphate cement(MKPC) paste with different contents of high magnesium nickel slag powder were studied and tested, and the phase composition and microscopic morphology of MKPC paste were analyzed. The results show that the fluidity of MKPC paste can be improved and the water stability of MKPC hardened body can be obviously improved by replacing dead burned magnesium oxide powder with a proper amount of finely ground high magnesium nickel slag powder. Among them, the 60 d water curing compressive strength residual rate of MKPC specimens mixed with 30%-40% high magnesium nickel slag powder exceeds 100%. Appropriate amount of high magnesium nickel slag powder can obviously improve the shrinkage deformation of MKPC hardened body, and the drying shrinkage rate of MKPC paste containing 30% high magnesium nickel slag powder after hydration for 60 d is only 48.1% of the reference sample. The improvement effect is due to the improvement effect of high magnesium nickel slag powder on the gradation of alkali component powder, so that the initial water cement ratio of MKPC paste is lower, the micro-aggregate effect of hard-to-grind coarse particles in high magnesium nickel slag powder and the activity effect of vitreous body, so that the structure of MKPC hardened body tends to be compact.更多还原