| 公成旭,张君.高韧性纤维增强水泥基复合材料的抗拉性能[J].水利学报,2008,39(3): |
| 高韧性纤维增强水泥基复合材料的抗拉性能 |
| Tensile performance of high ductile fiber reinforced cementitious composite |
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| DOI： |
| 中文关键词: 纤维增强水泥基复合材料 单轴拉伸 抗拉应变 裂纹宽度 |
| 英文关键词: fiber reinforced cementitious composite uniaxial tensile performance strain crack width |
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| 摘要点击次数: 3539 |
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| 中文摘要: |
| 本文通过对不同水灰比和粉煤灰掺量的6个配比的聚乙烯醇纤维增强水泥基复合材料单轴拉伸试验，研究了各配比试件的应力-应变关系及抗拉特征参数。试件采用150mm×75mm×15mm的长方形试块。至位移控制的拉伸试验机上进行拉伸试验，测定应力-应变完整曲线。试验结果表明，高韧性纤维增强水泥基复合材料在拉伸荷载下应力-应变关系可分为弹性上升阶段、应变硬化阶段和应变软化阶段。在所选取的材料及配比范围内，在单轴拉伸荷载下均能实现应变硬化与多重开裂，极限拉应变的最大值可达1.7％，最小和最大临界裂纹宽度分别为26μm和90μm。 |
| 英文摘要: |
| The stress strain relationship and tensile resistance parameters of polyvinyl alcohol (PVA) fiber reinforced cementitious composite were studied experimentally by uni axial tensile test. The specimens were 150mm×75mm×15mm with different water to cement ratios and fly ash quantities. The test was carried out by using displacement controlled test installation and complete stress strain curves were obtained. The results show that the stress strain curve can be divided into three periods: 1.elastic period, in which the strain is linearly proportional to stress; 2.strain hardening period, in which cracking occurs and the ratio of stress increment to strain increment is much lower than that in elastic period; 3.strain softening period, in which the cracks begin to propagate. The analysis of test data indicates that in the range of mix adopted in this experimental study, the pseudo strain hardening and multiple cracking performances can be realized. The ultimate tensile strain is 1.7%, and the minimum and maximumcrack widths are 26μm and 90μm respectively. |
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