高韧性水泥基复合材料配合比优化研究

Study on Mix Ratio Optimization of High Toughness Cement-based Composites

摘要:

为探究高韧性水泥基复合材料（Engineered Cementitious Composite，ECC）合理配合比，减少配合比对ECC性能的不利影响从而改善ECC的工作表现，在保持聚乙烯纤维（PE纤维）体积掺量2%的基础上，以砂胶比、粉煤灰替代率和减水剂掺量为基本参数设置9组正交试验进行流动指标、抗压、抗拉性能以及极限应变测试，并对实验结果中的影响参数进行分析。试验分析结果表明，在满足试验强度设计要求前提下，当选择0.3、35%、0.003比例的砂胶比、粉煤灰替代率和减水剂掺量配合比时，所得到PE-ECC流动性能、抗压强度、抗拉强度以及极限应变最佳，相比基础配合比显著改善了ECC的工作表现。

Abstract:

In order to explore the reasonable mix ratio of high toughness cement-based composite （engineered cementitious composite， ECC)， the adverse effect of mix ratio on ECC performance should be reduced to improve the job performance of ECC. On the basis of maintaining the volume content of polyethylene fiber （PE fiber) of 2%， nine groups of orthogonal test are set with the sand binder ratio， fly ash substitution rate and water reducing agent content as the basic parameters to carry out the flow index， compressive property， tensile property and ultimate strain tests. And the influencing parameters in the experimental results are analyzed. The experimental analysis results show that on the premise of meeting the design requirements of test strength， and when choosing 0.3， 35%， 0.003 ratio of sand binder ratio， fly ash replacement rate and water reducing agent content mix ratio， the obtained flow performance， compressive strength， tensile strength and ultimate strain of PE-ECC are the best， and the job performance of ECC is obviously improved in the comparison with basic mix ratio.