聚丙烯酰胺对水泥性质影响的试验研究  

Experimental Study on Influence of Polyacrylamide on Properties of Cement Paste

作　　者：张长清[1,2] 曹志宇[1] 张光国 黄知元 金文成[1,2] 易昌兴[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点试验室,湖北武汉430074 [3]广东长宏公路工程有限公司,广东广州511300

出　　处：《重庆交通大学学报（自然科学版）》2011年第6期1339-1343,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：广东省交通厅科技资助项目(2008-14)

摘　　要：增稠剂是配制自密实混凝土常用外加剂之一,研究了聚丙烯酰胺(PAM)增稠剂对水泥基本性质的影响。结果表明:水泥中掺入PAM后,水泥的标准稠度用水量随其掺量的增加而增大,水泥浆体的凝结时间延长;PAM适宜掺量为0.1‰～0.5‰,此时水泥屈服应力τ0最低,黏度η较高;在PAM掺量不大于0.5‰时,PAM减小水泥收缩;PAM对水泥浆电阻率的影响,反映了PAM的水解与交联的竞争作用。SEM表明,PAM引入封闭气泡到水泥中,同时还提高了水泥水化产物的密实程度,宏观表现是PAM掺量增加,强度没有明显增加或降低。Thickening agent is one of admixtures used for preparation of self-compacting concrete（SCC）.This research chose polyacrylamide（PAM） as thickener.Cement mixed with PAM,Water content of the Standard consistency of cement increases and the setting time of cement paste prolongs with the dosage of PAM.With PAM suitable dosage of 0.1‰ ~ 0.5‰,the yield stress（τ0） of cement is minimum and the viscosity（η） is higher.When PAM is less than 0.5‰,PAM could reduces the shrinkage of hardened cement paste.PAM＇s impacting on the electrical resistivity of cement paste reflects the competition between the cross-linking and hydrolysis of PAM.SEM shows that PAM introduces closed air bubbles into cement paste and increases the hydration products＇ compacting,so strength of cement couldn＇t show significant variation when the PAM dosage is increased.

关 键 词：聚丙烯酰胺 增稠剂 电阻率 水泥浆流变 

分 类 号：TU528.042[建筑科学—建筑技术科学]