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硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (9): 3028-3035.

• 水泥混凝土 • 上一篇    下一篇

絮凝剂对硅酸盐水泥砂浆性能的影响

王传林1,2, 张思仪1, 黄俊轩1, 姜涛1,2, 梁萍1, 周芷冰1, 王屹鸿1   

  1. 1.汕头大学土木与环境工程系,汕头 515063;
    2.广东省结构安全与监测工程技术研究中心,汕头 515063
  • 收稿日期:2022-04-12 修回日期:2022-06-20 出版日期:2022-09-15 发布日期:2022-09-27
  • 通讯作者: 姜 涛,博士,讲师。E-mail:tjiang@stu.edu.cn
  • 作者简介:王传林(1987—),男,博士,讲师。主要从事混凝土材料耐久性研究。E-mail:clwang@stu.edu.cn
  • 基金资助:
    国家自然科学基金(52008236);广东高校重点平台和科研项目(2021KQNCX021);大学生创新训练项目(202110560013)

Effect of Flocculant on Properties of Portland Cement Mortar

WANG Chuanlin1,2, ZHANG Siyi1, HUANG Junxuan1, JIANG Tao1,2, LIANG Ping1, ZHOU Zhibing1, WANG Yihong1   

  1. 1. Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, China;
    2. Guangdong Engineering Center for Structure Safety and Health Monitoring, Shantou 515063, China
  • Received:2022-04-12 Revised:2022-06-20 Online:2022-09-15 Published:2022-09-27

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

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