| 摘要: |
| 通过研究减缩剂对聚羧酸减水剂的塑化效果、聚羧酸减水剂对减缩剂的减缩效果以及两者同掺后对水泥基材料力学性能的影响来探讨两者的相容性.结果表明：两者在水泥基材料中的相容性良好，减缩剂对聚羧酸减水剂的塑化效果有一定提高作用，原因是减缩剂的加入会略微降低掺有聚羧酸减水剂的水泥颗粒表面的zeta电位，并且使聚羧酸的PEO支链得到伸展；聚羧酸减水剂对减缩剂的减缩效果有明显的增强作用，并且可以降低减缩剂对水泥基材料力学性能所产生的负面影响. |
| 关键词: 聚羧酸减水剂 减缩剂 相容性 塑化效果 干燥收缩 强度 |
| DOI：103969/j.issn1007 9629201402010 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(NSFC50972170)；国家重点基础研究发展计划(973计划)项目(2009CB623104)；高性能土木工程材料国家重点实验室开放基金项目(2010CEM011) |
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| Investigation on Compatibility of PolycarboxylicSuperplasticizer and Shrinkage Reducing Agent |
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GUO Qingchun1, WANG Zhi2, DANG Yudong3, QIAN Jueshi3, JIANG Nan2
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1.Shanghai Research Institute of Building Science, Shanghai 201108, China;2.College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400044, China;3.College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
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| Abstract: |
| Compatibility of the polycarboxylic superplasticizer(PC) and shrinkage reducing admixture(SRA) was investigated by assessing the interaction between PC and SRA in cement mixtures, e.g., the influence of SRA on the plasticizing effect of PC, the influence of PC on shrinkage mitigation of SRA, and the effect on strength of cement mixed with PC and SRA. The results indicate that SRA can slightly enhance the plasticizing effect of PC in cement mixture, since the presence of SRA can slightly reduce the zeta potential of cement particles in PC system. The extensibility of PEO is stretched in the presence of the SRA. On the other hand, the shrinkage reducing effect of SRA was significantly improved in the presence of PC. In addition, the negative effect of SRA on strength of cement mixture can be mitigated by the cooperation of the PC. |
| Key words: polycarboxylic superplasticizer(PC) shrinkage reducing admixture(SRA) compatibility plasticizing effect drying shrinkage strength |
