细集料对SHCC力学性能的影响研究

发布时间：2018-01-01 05:12

本文关键词：细集料对SHCC力学性能的影响研究　出处：《混凝土》2016年07期 　论文类型：期刊论文

【摘要】：选用国产PVA纤维和不同级配的普通砂分别代替进口PVA纤维和标准砂制作SHCC试样,测试其28d拉伸应力应变关系、抗压强度及弹性模量。研究表明:不同级配的砂对SHCC拉伸性能的影响较大,但对抗压强度和弹性模量的影响较小。选用粒径小于0.6mm的普通砂和国产PVA纤维可以配制延性较好的SHCC,拉伸过程中可观察到多条细密裂纹。极限拉应变为3.05%,拉伸强度为3.1MPa。
[Abstract]:The PVA fiber made in China and the ordinary sand with different grades were used to make SHCC samples instead of imported PVA fibers and standard sand, respectively. The tensile stress-strain relationship of the samples was tested at 28 days. The compressive strength and elastic modulus. The results show that the different grade of sand has a great influence on the tensile properties of SHCC. But it has little effect on compressive strength and elastic modulus. SHCC with good ductility can be prepared by using ordinary sand with diameter less than 0.6 mm and PVA fiber made in China. Several fine cracks can be observed during the tensile process. The ultimate tensile strain is 3.05 and the tensile strength is 3.1 MPA.
【作者单位】：武汉理工大学理学院工程结构与力学系;恒润集团有限公司;
【基金】：国家高技术研究发展计划(2013AA031306) 湖北省自然科学基金(2014CFB866) 河北省百人计划项目资助武汉理工大学自主创新研究基金项目(155214008)
【分类号】：TU528
【正文快照】： 0引言 SHCC(Strain Hardening Cement-based Composites)是一种具有高延性、高韧性和多缝开裂特征的纤维增强水泥基复合材料。最早由Victor Li于20世纪90年代采用聚乙烯醇纤维(又称为维纶纤维或PVA纤维)作为增强材料,基于细观力学和断裂力学方法设计的短纤维增强水泥基复合材

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