混杂纤维高韧性水泥基复合材料弯曲性能试验研究  

Experiment Study on Bending Properties of Hybrid Fiber Engineered Cementitious Composite

作　　者：池善庆 江正航 林若鸣 许莉[2] CHI Shanqing;JIANG Zhenghang;LIN Ruoming;XU Li(Fuzhou Urban and Rural Construction Group Co.,Ltd.,Fuzhou,Fujian 350001,China;College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州市城乡建总集团有限公司,福建福州350001 [2]福州大学土木工程学院,福建福州350108

出　　处：《水利与建筑工程学报》2024年第3期174-181,195,共9页Journal of Water Resources and Architectural Engineering

基　　金：福建省自然科学基金(面上)项目(2020J01479)。

摘　　要：为研究三种纤维混杂对高韧性水泥基复合材料(ECC)弯曲性能的影响,将聚乙烯(PE)纤维与钢纤维(SF)、玄武岩纤维(BF)混杂,通过21组四点弯曲试验,分析试件的受力、破坏过程及不同混杂纤维掺量对弯曲性能的影响,并将弯曲性能试验结果与拉伸性能试验结果进行比对,得到混杂纤维ECC的弯、拉对应关系。研究结果表明:与单掺PE相比,复掺纤维可有效提高ECC的弯曲极限强度,但会损失一定程度的延性。钢纤维掺量对延性性能影响较大,建议钢纤维掺量不超过0.4%,且总纤维掺量不超过2.3%。玄武岩纤维对混杂纤维ECC起到良好的增强、增加延性作用。基于弯-拉关系得到的极限拉伸应变与试验值吻合良好,因此四点弯曲试验可以代替单轴拉伸试验来评价混杂纤维ECC的力学性能。To analyze the influence of triple mixing on the bending properties of Engineered Cementitious Composites(ECC), through the four-point bending tests of twenty-one groups, the loading process, failure modes and load-deflection curves of each group were observed, the influence of hybrid fiber content on bending performance were analyzed, and the bending-tensile correspondence of hybrid fiber ECC was obtained by comparing the bending performance test results with the tensile performance test results. Results show that hybrid fiber can effectively improve the bending ultimate strength of ECC, but also lose a certain degree of ductility. The dosage of steel fiber has significant influence on the ductility performance, it is recommended that the dosage of steel fiber should not exceed 0.4%, and the total fiber dosage should not exceed 2.3%. Basalt fiber has a unique role in enhancing and increasing ductility of hybrid fiber ECC. The ultimate tensile strain value calculated by the bending-tensile correspondence agree well with the test result, which can accurately describe the tensile behavior of hybrid fiber ECC. The four-point bending test can replace the uniaxial tensile test to evaluate the mechanical properties of hybrid fiber ECC.

关 键 词：混杂纤维 水泥基复合材料 弯曲性能 荷载-挠度曲线 聚乙烯纤维 

分 类 号：TU528.572[建筑科学—建筑技术科学]