东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2010, Vol. 31 ›› Issue (2): 236-240.DOI: -

• 论著 • 上一篇    下一篇

水灰比和聚灰比对改性砂浆性能和微观结构的影响

赵文杰;张会轩;张宝砚;   

  1. 东北大学理学院;长春工业大学化学工程学院;中国科学院长春应用化学研究所;
  • 收稿日期:2013-06-20 修回日期:2013-06-20 出版日期:2010-02-15 发布日期:2013-06-20
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    国家高技术研究发展计划项目(2004AA304020)

Effects of polymer-cement ratio and water-cement ratio on properties and microstructure of modified mortars

Zhao, Wen-Jie (1); Zhang, Hui-Xuan (2); Zhang, Bao-Yan (1)   

  1. (1) School of Sciences, Northeastern University, Shenyang 110004, China; (2) Institute of Chemical Engineering, Changchun University of Technology, Changchun 130012, China; (3) Changchun Institute of Applied Chemistry, Chinese Acad. of Sci., Changchun 130022, China
  • Received:2013-06-20 Revised:2013-06-20 Online:2010-02-15 Published:2013-06-20
  • Contact: Zhao, W.-J.
  • About author:-
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摘要： 将核壳比为50/50的聚丁二烯接枝聚苯乙烯(PB-g-PS)胶乳用于改性水泥砂浆,考察了聚灰比(聚合物对水泥的质量比)和水灰比(水对水泥的质量比)对改性水泥砂浆的流动度、抗压和抗折强度以及水吸收速率的影响.结果表明:改性砂浆的流动度随水灰比和聚灰比的增加而增加;胶乳能显著降低改性砂浆的毛细孔吸水率;改性砂浆的抗压强度降低,但当水灰比较低时,部分改性砂浆的抗折强度有所提高.微观结构分析表明:改性砂浆的结构更加致密,从而有利于性能的提高.

关键词: 核壳胶乳, 改性水泥砂浆, 砂浆性能, 微观结构, 水灰比, 聚灰比

Abstract: The polybutadiene-graft-polystyrene (PB-g-PS) latex with a core-shell ratio 50/50 was used to modify cement mortar. The effects of water-cement ratio (W/C) and the polymer-cement ratio (P/C) on the flowability, compressive/flexural strength and water absorption rate of the cement mortar modified with PB-g-PS core-shell structure latex were investigated. Experimental results showed that the flowability of modified mortar increases with increasing P/C and W/C, and the PB-g-PS latex can remarkably reduce the capillary water absorption rate. Although the compressive strength of the PMM (polymer modified mortar) decreases, the flexural strength of part of PMMs increases to a certain extent at low W/C. The microstructural analysis showed that the mortar modified in such way is of more compact structure, thus benefitting the improvement of its performance.

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