混杂纤维增强应变硬化水泥基复合材料(HyFRSHCC)的力学性能  

Mechanical Properties of Hybrid Fiber Reinforced Strain Hardening Cementitious Composites(HyFRSHCC)

作　　者：韩世诚 张聪[1,2] 华渊[1] HAN Shi-cheng;ZHANG Cong;HUA Yuan(School of Environment and Civil Engineering,Jiangnan University,Wuxi 214000,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430000,China)

机构地区：[1]江南大学环境与土木工程学院,无锡214000 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430000

出　　处：《硅酸盐通报》2019年第1期77-82,87,共7页Bulletin of the Chinese Ceramic Society

基　　金：江苏省自然科学基金(BK20170192);江苏省研究生实践创新计划(SJCX17_0500);硅酸盐建筑材料国家重点实验室开放基金(SYSJJ2017-11)

摘　　要：为提高高性能纤维增强水泥基复合材料的性价比,设计了一种由聚乙烯醇(PVA)纤维、钢纤维以及碳酸钙晶须作为增强材料,水泥砂浆作为基体的混杂纤维增强应变硬化水泥基复合材料(HyFRSHCC)。通过单轴压缩试验和四点弯曲试验对这种HyFRSHCC的抗压和抗弯性能进行了研究。结果表明HyFRSHCC的抗压强度高于基体材料,且在破坏时能保持良好的整体性;在弯曲荷载作用下表现出显著的应变硬化特征及多缝开裂行为,具有较高的能量吸收能力与变形能力。扫描电子显微镜(SEM)的观察结果表明碳酸钙晶须在材料破坏过程中限制了微裂缝的发展,而PVA纤维与钢纤维实现了对宏观裂缝的控制。通过引入碳酸钙晶须和钢纤维可以适量代替价格较高的PVA纤维,降低纤维增强应变硬化水泥基复合材料的成本。To improve the cost performance of high performance fiber reinforced cementitious composites,one kind of hybrid fiber reinforced strain hardening cementitious composites(HyFRSHCC)containing polyvinyl alcohol(PVA)fiber,steel fiber and calcium carbonate whisker was designed.The flexural and compressive performances of the designed HyFRSHCC were studied through four-point flexural test and uniaxial compression test.The results indicate that the designed HyFRSHCC has a higher compressive strength than mortar matrix and keeps good integrality at failure.The designed HyFRSHCC shows an obvious strain hardening performance and multiple cracking behavior with a high energy absorption capacity and deformability.The results of scanning electron microscope pictures illustrate that the addition of whisker can restrict the micro cracks,while the PVA fiber and steel fiber can control the macro cracks during the failure process of composites.The introduction of whisker and steel fiber can appropriate replace the use of PVA fiber,thus reducing the cost of fiber reinforced strain hardening cementitious composites.

关 键 词：PVA纤维 钢纤维 碳酸钙晶须 混杂纤维 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]