| 聚丙烯酰胺对水泥性质影响的试验研究 |
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| 引用本文： | 张长清,曹志宇,张光国,黄知元,金文成,易昌兴.聚丙烯酰胺对水泥性质影响的试验研究[J].重庆交通大学学报(自然科学版),2011(6):1339-1343. |
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| 作者姓名： | 张长清 曹志宇 张光国 黄知元 金文成 易昌兴 |
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| 作者单位： | 华中科技大学土木工程与力学学院;华中科技大学控制结构湖北省重点试验室;广东长宏公路工程有限公司 |
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| 基金项目： | 广东省交通厅科技资助项目(2008-14) |
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| 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:水泥中掺人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T0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...
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| 关 键 词： | 聚丙烯酰胺 增稠剂 电阻率 水泥浆流变 |
Experimental Study on Influence of Polyacrylamide on Properties of Cement Paste |
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| ZHANG Chang-qing,CAO Zhi-yu,ZHANG Guang-guo,HUANG Zhi-yuan,JIN Wen-cheng,YI Chang-xing.Experimental Study on Influence of Polyacrylamide on Properties of Cement Paste[J].Journal of Chongqing Jiaotong University,2011(6):1339-1343. |
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| Authors: | ZHANG Chang-qing CAO Zhi-yu ZHANG Guang-guo HUANG Zhi-yuan JIN Wen-cheng YI Chang-xing |
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| Institution: | 1 (1.School of Civil Engineering & Mechanics,Huazhong University of Science & Technology,Wuhan 430074,Hubei,China; 2.Hubei Key Laboratory of Control Structure,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China; 3.Guangdong Changhong Highway Engineering Co.,Ltd.,Guangzhou 511300,Guangdong,China) |
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| Abstract: | 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. |
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| Keywords: | polyacrylamide thickener electrical resistivity rheology of cement paste |
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