压剪作用下PVA纤维再生混凝土力学性能试验研究  

Mechanical Properties of Polyvinyl Alcohol Fiber Recycled Concrete UnderCompression and Shear

作　　者：陈宇良[1] 张绍松 徐金俊 叶培欢 姜锐 CHEN Yuliang;ZHANG Shaosong;XU Jinjun;YE Peihuan;JIANG Rui(School of Civil Engineering,Guangxi University of Science and Technology,Liuzhou 545006,Guangxi,China;School of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)

机构地区：[1]广西科技大学土木建筑工程学院,广西柳州545006 [2]南京工业大学土木工程学院,南京211816

出　　处：《材料导报》2023年第11期108-114,共7页Materials Reports

基　　金：国家自然科学基金(51908141);广西自然科学基金(2019GXNSFBA245030);中国博士后科学基金(2021M693854);广西科技大学博士基金项目(校科博18Z09)。

摘　　要：为了研究压剪作用下外掺聚乙烯醇(PVA)纤维对再生混凝土力学性能的影响,以再生粗骨料取代率、压应力比和PVA纤维体积掺量为变化参数,设计并制作144个立方体试件进行压剪试验。观察了试件的破坏形态,得到了荷载-位移曲线及垂直变形-剪切位移曲线,分析了不同变化参数对抗剪强度、峰值位移的影响规律。结果表明:0.1%体积掺量的PVA纤维对再生混凝土的抗剪强度提高了10%;随着压应力比的增大,试件的抗剪强度呈增大趋势,平均增大了2.03倍;与普通混凝土相比,再生混凝土试件的抗剪强度平均降低了13%;当再生粗骨料取代率为100%时,PVA纤维最佳掺量为0.1%;提出了纤维掺量为0.1%时压剪作用下PVA纤维再生混凝土抗剪强度计算公式。In order to study the influence of polyvinyl alcohol(PVA)fiber on the mechanical properties of recycled aggregate concrete under compression and shear,144 cubes were designed and fabricated using replacement rate of recycled coarse aggregate,compressive stress ratio and volume content of PVA fiber as the changing parameters.The specimen is subjected to compression shear test.The failure mode of the specimen was observed,the load-displacement curve and the vertical deformation-shear displacement curve were obtained,and the influence of different changing parameters on the shear strength and peak displacement was analyzed.The results show that:the shear strength of recycled concrete with 0.1%PVA fiber increased by 10%;with the increase of compressive stress ratio,the shear strength of the specimen increased by 2.03 times on average.Compared with ordinary concrete,the shear strength of recycled concrete decreases by 13%on average%.When the replacement rate of recycled coarse aggregate is 100%,the optimum content of PVA fiber is 0.1%;the calculation formula of the shear strength of PVA fiber recycled aggregate concrete under compression and shear is proposed when the content of fiber is 0.1%.

关 键 词：聚乙烯醇纤维 再生混凝土 压-剪复合受力 抗剪强度 力学性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]