减缩型聚羧酸减水剂抗裂性能及作用机理研究

Study on the crack resistance and function mechanism of high performance shrinkage-reducing water reducer

减缩型减水剂对提高现代混凝土体积稳定性具有至关重要的作用。采用平板法评价减缩型聚羧酸减水剂(PCA-R)的抗裂性能。通过测试掺该类减水剂的模拟水泥石孔溶液的表面张力,分析水泥石的孔结构及水泥水化产物微观形貌。试验结果表明,该PCA-R具有良好的减缩抗裂效果,能用于减缩抗裂性能要求严格的工程。

Shrinkage-reducing water reducer is important to the volume stability of modem concrete. The article used the concrete slab test to evaluate the crack resistance of high performance shrinkage-reducing polycarboxylic acid water reducer. By measuring the surface tenslon, analyzing pore structure and microstmcture of the cement solution. The result showed that PCA-R has a good performance on the concrete crack resistance and can be used for the strict engineering.