絮凝剂对硅酸盐水泥砂浆性能的影响

摘要/Abstract

摘要： 机制砂残留的不同浓度的絮凝剂会对混凝土相关性能产生不利影响。本文研究了三种絮凝剂(阴离子聚丙烯酰胺(APAM)、非离子聚丙烯酰胺(NPAM)和聚合氯化铝(PAC)),四种掺量(0%、0.015%、0.030%、0.050%,质量分数)对硅酸盐水泥流动度、凝结时间及力学性能的影响,并使用X射线衍射(XRD)和扫描电子显微镜(SEM)技术分析絮凝剂对硅酸盐水泥性能的影响机理,研究了减水剂、缓凝剂和分散剂在改善絮凝剂对砂浆流动度和力学性能产生的不利影响方面的作用。结果表明:APAM对净浆流动度的影响较大,NAPM的影响次之,PAC的影响不明显;APAM和NPAM均能小幅缩短净浆凝结时间,而PAC会小幅延长净浆凝结时间;三种絮凝剂均能小幅降低砂浆强度,且整体上掺量越高,下降幅度越大;三种絮凝剂基本不改变硅酸盐水泥水化产物,但APAM和PAC能促进水泥的水化,而NPAM抑制水泥的水化。共同使用减水剂和缓凝剂能显著提高掺有絮凝剂砂浆的流动度和抗压强度。

关键词: 硅酸盐水泥砂浆, 机制砂, 絮凝剂, 流动度, 凝结时间, 力学性能, 微观结构, 外加剂

Abstract: The residual flocculant in manufactured sand produces adverse impact on properties of concrete. The effects of three types of flocculants, which are anionic polyacrylamide (APAM), nonionic polyacrylamide (NPAM) and polyaluminium chloride (PAC), and four dosages (0%, 0.015%, 0.030%, 0.050%, mass fraction) on the fluidity, setting time and mechanical properties of Portland cement were examined. X-ray diffraction (XRD) detection and scanning electron microscope (SEM) examination were conducted to explore the affecting mechanism of flocculants. In additions, the effects of water reducing agent, retarder and dispersant on the fluidity and mechanical strength reduced by flocculant were studied. The results show that APAM affects the fluidity of paste most significantly, and NPAM secondly, while PAC the least. Both APAM and NPAM slightly shorten the setting time, while PAC slightly prolongs the setting time of paste. Three flocculants all reduce the strength of mortar, and the higher the dosage is, the greater the decline is. Three flocculants all hardly change the hydration products of Portland cement, while APAM and PAC promote cement hydration, and NPAM inhibits the hydration. The combined use of water reducing agent and retarder significantly improves the fluidity and compressive strength of mortar mixed with flocculant.

Key words: Portland cement mortar, manufactured sand, flocculant, fluidity, setting time, mechanical property, microstructure, admixture

中图分类号:

TQ172.1

王传林, 张思仪, 黄俊轩, 姜涛, 梁萍, 周芷冰, 王屹鸿. 絮凝剂对硅酸盐水泥砂浆性能的影响[J]. 硅酸盐通报, 2022, 41(9): 3028-3035.

WANG Chuanlin, ZHANG Siyi, HUANG Junxuan, JIANG Tao, LIANG Ping, ZHOU Zhibing, WANG Yihong. Effect of Flocculant on Properties of Portland Cement Mortar[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3028-3035.

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