纳米颗粒对新拌水泥浆体性能的影响  

Effect of Nano-particles on Performance of Fresh Cement Paste

作　　者：刘小艳[1] 王婷[1] 陈雷[1] 

机构地区：[1]河海大学力学与材料学院,南京210098

出　　处：《粉煤灰综合利用》2014年第2期11-14,共4页Fly Ash Comprehensive Utilization

基　　金：国家自然科学基金(51009057)

摘　　要：研究了单掺纳米SiO2、纳米粘土、纳米Al2O3、纳米CaCO3颗粒对新拌水泥浆体标准稠度用水量、凝结时间、流动性的影响。研究发现:纳米SiO2、纳米粘土、纳米Al2O3导致水泥浆体标准稠度用水量不同程度的增加,且纳米颗粒掺量越大标准稠度用水量越大;纳米颗粒使水泥浆体粘聚性增大,相同水胶比时掺入纳米颗粒使浆体流动性降低;纳米SiO2、纳米CaCO3、纳米Al2O3促进了水泥水化,使初凝和终凝时间提前,但纳米粘土表现出一定的缓凝作用。In this paper, the activity of nano-Si02, nano-clay, nano-Al2O3and nano-CaCO3is introduced. Effect of these nano-particles on water requirement of normal consistency, the fluidity and setting time of fresh cement paste are studied. The results show that, except nano-CaCO3 , the content of the other three nano-particles is larger, the water requirement of normal consistency of cement is greater. All nano-particles enlarge the cohesiveness of fresh cement paste and decrease the fluidity of cement paste. Nano-SiO2, nano-Al2O3 and nano-CaCO3 promote the early hydration of cement and shorten the setting time, and nano-clay plays the role of delaying coagulation.

关 键 词：纳米颗粒 新拌浆体 标准稠度 凝结时间 

分 类 号：TQ172.7[化学工程—水泥工业]