摘要
从助磨和增强的角度优选高性能的水泥助磨剂 ,通过激光粒度分析、休止角测定、XRD ,TG -DTA分析等物理、化学分析方法 ,系统地研究了高性能助磨剂对普通硅酸盐水泥粉体特性及水泥浆体物理化学性能的影响 .结果表明 :在实验室研究中 ,高性能助磨剂对普通硅酸盐水泥具有良好的助磨作用和增强作用 :提高了水泥的粉磨细度 ;使水泥的流动性增强 ;改善了水泥的粒度组成和颗粒分布 ,使水泥颗粒的平均粒径减小 ,粒度分布变窄 ,细颗粒含量增加 ,最主要的是使中值粒径 3～ 32 μm含量增加 ;提高了水泥 3d ,2 8d强度 ,使水泥浆体的结构更致密 .助磨剂的作用机理主要是减小粉碎阻力、防止团聚和糊磨、提高流动性 ,从而加强了料和球的作用频率和效率 .助磨剂对水泥的增强作用主要是由于加入助磨剂后水泥颗粒分布的改变 .
In terms of aid grinding and enhancing strength of the pastes, high performance grinding aid A has been found. The effect of high performance grinding aids on powder properties and physical and chemical performance of ordinary portland cement pastes have been systematically studied by various physical and chemical analysis methods, such as laser particle size distribution analysis, XRD, TG-DTA and so forth. The results show that high performance grinding aid has greater effect on grinding and strength of the cement pastes. It improves the flowability, increases fineness, improves particle size composition and distribution including reducing mean diameter and narrowing down particle size distribution and increasing the content of fine particles especially of 3-32 μm particles. The high performance grinding aids increase strength of 3 d and 28 d of cement mortar and accelerate the hydration of cement by increasing the crystalline and compactness of hydration products. The grinding mechanism is that grinding aids can reduce resistance to comminution, prevent reduction in agglomeration and ball and mill wall coating, improve the flowability which will intensify frequency and efficiency between particles and media. The major reason of enhancing strength of the pastes of grinding aids is that grinding aid A improves particle size distribution.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2001年第6期507-511,共5页
Journal of The Chinese Ceramic Society
关键词
水泥助磨剂
流动性
分散度
增强机理
助磨机理
Additives
Agglomeration
Grinding (machining)
Particle size analysis
Physical chemistry
