混杂PVA-ECC配合比优化设计及力学性能试验研究

发布时间：2018-06-14 11:41

本文选题：水泥基复合材料 + 聚乙烯醇纤维　；参考：《土木建筑与环境工程》2015年05期

【摘要】：为了降低工程用水泥基复合材料(ECC,Engineered Cementitious Composites)制造成本,使ECC能够在实际工程中大规模应用,将中国产PVA纤维和日本产PVA纤维以一定的比例混合,配制混杂PVA-ECC。基于ECC的材料设计理论,兼顾抗压强度和受拉能力,对掺有硅粉的混杂PVA-ECC中的纤维体积含量进行了优化设计。通过四点弯曲试验和轴心抗压试验,研究了混杂PVA-ECC在不同龄期下的弯曲性能和抗压性能。试验结果表明,混杂PVA-ECC试件均表现出明显的应变硬化和多缝开裂的特征,此外,其抗压强度后期增长明显。基于UM法,提出一种改进的反分析方法,可利用四点弯曲试验结果推导ECC的极限拉伸应变,并与试验结果进行了比较,结果表明,通过建议的反分析方法得到的预测值与试验值吻合较好。
[Abstract]:In order to reduce the manufacturing cost of engineering cement based composite materials, ECC can be used in practical engineering on a large scale. The hybrid PVA-ECCs are prepared by mixing PVA fiber made in China and PVA fiber made in Japan in a certain proportion. Based on the material design theory of ECC, the fiber volume content in hybrid PVA-ECC with silicon powder was optimized by taking into account the compressive strength and tensile capacity. The flexural and compressive properties of hybrid PVA-ECC at different ages were studied by four-point bending test and axial compression test. The experimental results show that the hybrid PVA-ECC specimens show obvious strain hardening and multi-joint cracking characteristics, in addition, the compressive strength of hybrid PVA-ECC specimens increases obviously in the later stage. Based on the UM method, an improved back-analysis method is proposed. The ultimate tensile strain of ECC can be deduced by using the results of four-point bending test, and the results are compared with the experimental results. The predicted values obtained by the suggested inverse analysis method are in good agreement with the experimental values.
【作者单位】：东南大学土木工程学院;同济大学土木工程学院;上海市建筑科学研究院(集团)有限公司;
【基金】：国家自然科学基金(51208093、5141101015) 教育部博士点基金项目(20120092120021)~~
【分类号】：TU528

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