玄武岩纤维织物高延性混凝土拉伸性能  

Tensile Mechanical Properties of Basalt Textile Reinforced Highly Ductile Concrete

作　　者：邓明科[1] 韦鼎 张伟[1] 董志芳 杨铄 范洪侃 DENG Mingke;WEI Ding;ZHANG Wei;DONG Zhifang;YANG Shuo;FAN Hongkan(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;College of Architecture and Civil Engineering,Shangqiu Normal University,Shangqiu 476000,China;Shanghai Key Laboratory of Engineering Structure Safety,Shanghai Research Institute of Building Sciences Co.Ltd.,Shanghai 200032,China;Xi’an Wuhe New Civil Engineering Material Co.Ltd.,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]商丘师范学院建筑工程学院,河南商丘476000 [3]上海市建筑科学研究院有限公司上海市工程结构安全重点实验室,上海200032 [4]西安五和土木工程新材料有限公司,陕西西安710055

出　　处：《湖南大学学报（自然科学版）》2023年第9期97-108,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51878545);西安市重大科技创新计划项目(20191522415KYPT015JC017)。

摘　　要：为研究玄武岩纤维织物高延性混凝土(TR-HDC)的拉伸力学性能,设计和制作了36组TR-HDC狗骨形拉伸试件,通过单轴拉伸试验研究织物配网率、PVA短纤维掺量、基体类型和网格间距(5mm、10mm)对TR-HDC拉伸力学性能的影响.试验结果表明:随织物配网率的增加,TR-HDC试件的抗拉强度大幅提高,多裂缝开展特征明显;PVA短纤维的掺入可有效改善织物与基体的界面特性,防止基层的剥离,减少织物与基体之间的滑移,并且提高织物强度利用率;网格间距增大时,掺入的PVA短纤维更容易穿过织物网格,与纤维束充分接触,增加了织物与基体的机械锚固力,使纤维织物的强度利用率提高;基体中粉煤灰掺量的改变对于TR-HDC试件的抗拉强度影响较小,而粉煤灰掺量较多时,试件的应变较大,裂缝间距较小.通过对试验结果进行回归分析,考虑PVA掺量与纤维织物耦合作用,给出了TR-HDC单轴抗拉强度简化计算模型.To study the tensile mechanical properties of basalt textile reinforced highly ductile concrete(TRHDC),36 sets of TR-HDC dog-bone tensile specimens were designed and manufactured.The effects of the textile reinforcing ratio,PVA short fiber content,matrix type and mesh spacing(5mm,10mm)on the tensile mechanical properties of TR-HDC were studied through uniaxial tensile tests.The research results showed that with the increase of the textile reinforcing ratio,the tensile strength of the TR-HDC specimens were significantly improved,and the multi-cracking characteristics were obvious.The adding of PVA short fiber effectively improved the interface property between textile and matrix,which prevented the stripping of base,reducing the slip between textile and matrix.Thus,the strength utilization rate of textile were improved.As the mesh spacing increased,the PVA short fiber can easily pass through the mesh and fully contact with the fiber bundle.This effect increased mechanical anchorage between textile and matrix,thus contributing to the improvement the strength utilization rate of the textile.The change of fly ash admixture in the matrix had little effect on the tensile strength of TR-HDC specimens,while the specimens with more fly ash content showed larger strain and smaller crack spacing.Based on regression analysis of the test results,the simplified TR-HDC uniaxial tensile strength calculation model is proposed by considering the coupling effect of PVA short fiber content and textile reinforcing ratio.

关 键 词：复合材料 玄武岩纤维织物 高延性混凝土 拉伸性能 网格间距 

分 类 号：TU528.58[建筑科学—建筑技术科学]