水泥颗粒分布对抗压强度的影响  

The Effect of Granulometric Distribution of Cement on Compressive Strength

作　　者：龚燕华 

机构地区：[1]南通市建筑科学研究院有限公司,江苏南通226002 [2]南通建工集团股份有限公司,江苏南通226006

出　　处：《工程质量》2015年第7期87-90,共4页Construction Quality

基　　金：住建部2014年科学技术计划项目(2014-K1-051)

摘　　要：研究了不同粉磨时间下水泥的比表面积及颗粒分布特征对不同龄期水泥胶砂强度的影响,结合水化热测定仪探究了水泥的早期水化放热规律,并运用SEM对水泥颗粒细度对其水化进程不同阶段展现出的微观结构特征进行了研究。结果表明:在等量助磨剂下,随着粉磨时间的增加,水泥粒径分布向小粒径方向靠近,水泥颗粒细度与水泥颗粒的比表面积变大,且水泥颗粒细度的增加,可提高水泥胶砂的抗压强度;从SEM图像分析得,无论是3 d还是28 d,颗粒细度较大的水泥水化产物越多,水化程度越完全,微观结构更加密实。The influence of specific surface area and distributing characteristic of cement particles under various grinding time on compressive strength of cement mortar was investigated in this paper. The hydration exothermic regularity of cement with different specific surface area was found by means of the hydration heat meter and the microstructure of hydration products was analyzed by SEM. Results suggested that the distribution of cement particles tend to move to the discreasing direction of grain size and the fineness of cement as well as specific surface area will increase with the grinding time prolong under the coincident dosage of grinding aids. The compressive strength of cement mortar will enhance with the increasing fineness of cement particles. Furthermore, it can be concluded by analyzing the SEM that cement with a larger specific surface area will result in a more close-grained micro structure in cement hydrations products which may contribute to macro-performance of mortar, such as compressive strength.

关 键 词：颗粒分布 水化热 SEM 

分 类 号：TU501[建筑科学—建筑技术科学]