摘要
为改善磷酸钾镁水泥(MKPC)浆体的早期性能,并充分利用固废微粉,采用宏观性能测试和微观结构分析相结合的方法,研究了不同掺量的粉煤灰、钢渣和镍渣微粉对磷酸钾镁水泥浆体早期(常温养护24h)的水化温度、抗压强度和体积变形的影响规律。结果表明:三种固废微粉的掺入,可使复合MKPC浆体的第一水化温度峰值降低3～10℃,其中钢渣的掺入效果显著,使其第一峰值出现的时间延迟30min以上。考虑固废微粉的最大利用率并参照快速修补材料1d强度不低于42.5 MPa的规定,粉煤灰、钢渣和镍渣微粉的适宜掺量分别为20%、30%和30%。复合MKPC硬化浆体在养护24h时的体积膨胀率较对比组均有所增加。此外,微观分析表明含固废微粉的MKPC硬化浆体生成晶体的数量增多、尺寸变小且形貌发生改变,结构堆积也明显变得致密。
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.
作者
张洁
张建建
孙国文
杨建明
汤青青
ZHANG Jie;ZHANG Jianjian;SUN Guowen;YANG Jianming;TANG Qingqing(School of Materials Science and Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043;College of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第20期3553-3561,3565,共10页
Materials Reports
基金
国家自然科学基金(51478278)
河北省自然科学基金(E2014210149)
教育厅重点项目(ZD2016065)
关键词
磷酸钾镁水泥
固废微粉
早期性能
水化温度
抗压强度
体积变形
作用机理
magnesium potassium phosphate cement
solid waste micro-powder
early properties
hydration temperature
compressive strength
volume deformation
mechanism of action
