| 林桂武,刘凯格,陈宇良*,徐鸿飞.纤维再生混凝土劈裂抗拉力学性能试验研究[J].实验力学,2022,37(5):711~721 |
| 纤维再生混凝土劈裂抗拉力学性能试验研究 |
| Study on splitting tensile mechanical properties of different fiberrecycled concrete |
| 投稿时间：2021-09-27 修订日期：2022-02-12 |
| DOI：10.7520/1001-4888-21-229 |
| 中文关键词: 纤维 再生混凝土 劈拉强度 力学性能 |
| 英文关键词:fiber recycled concrete splitting tensile strength mechanical property |
| 基金项目:中国博士后科学基金(2021M693854)；广西自然科学基金(2019GXNSFBA245030)；广西水工程材料与结构重点实验室(GXHRI-WEMS-2020-05)；柳州欧维姆机械股份有限公司博士后科研工作站科研项目(202123) |
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| 中文摘要: |
| 为研究纤维再生混凝土(FRAC)的抗拉性能,以纤维类型和再生骨料取代率为变化参数,对4种纤维再生混凝土进行劈裂抗拉试验。试验观察了试件的破坏形态,获取了FRAC的荷载-位移曲线及抗拉强度等数据,并深入分析了变化参数对FRAC劈裂抗拉力学性能及耗能能力的影响规律。结果表明：与碳纤维、聚丙烯纤维和聚乙烯醇纤维相比,钢纤维的增韧效果更明显,且掺入钢纤维可有效提高再生混凝土的劈拉强度与耗能能力；掺入0.3%的碳纤维后,再生混凝土的抗拉强度和拉压比分别平均提高了95.9%和71.8%；掺入聚乙烯醇纤维和聚丙烯纤维对再生混凝土改性效果不显著；随着取代率增加,纤维再生混凝土的劈裂抗拉强度及耗能能力均逐渐降低,拉压比先增大后减小。基于试验数据,文中还提出了FRAC劈拉强度的计算关系式。 |
| 英文摘要: |
| In order to study the tensile properties of fiber recycled concrete (FRAC), the fiber type and recycled aggregate replacement rate were set into variable parameters to conduct splitting tensile test on 4 kinds of fiber recycled concrete. The failure modes of specimens were observed in the test, important data were obtained such as load-displacement curves and the tensile strength of FRAC, and the influence of variable parameters on the mechanical properties of the splitting tensile and energy consuming capacity of FRAC was deeply analyzed. Test results show that the toughening effect of steel fiber on recycled concrete is the most obvious compared with carbon fiber, polypropylene fiber and polyvinyl alcohol fiber, the energy consuming capacity and the splitting tensile strength of recycled concrete improve effectively with the incorporation of steel fiber. After the 0.3% carbon fiber is added, the tensile strength and the tension-compression ratio of recycled concrete increase on average by 95.9% and 71.8%. The incorporation of polyvinyl alcohol fibers or polypropylene fibers do not significantly modify recycled concrete. As the replacement rate gradually increases, the splitting tensile strength and energy consuming capacity of fiber recycled concrete gradually decrease, and the tension-compression ratio first increases and then decreases. Based on the test data,the calculation formulas of splitting tensile strength on FRAC are proposed. |
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