纤维增强混凝土的黏结性能试验研究  

Experimental study on the bonding properties of fiber reinforced concrete

作　　者：季自刚 王忠培 JI Zigang;WANG Zhongpei(Zhongjiao Construction Group Co.,Beijing 101100,China;College of Civil Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]中交建筑集团有限公司,北京101100 [2]武汉理工大学土木工程学院,湖北武汉430070

出　　处：《混凝土》2023年第12期253-257,共5页Concrete

摘　　要：为研究纤维增强混凝土的黏结性能,以拉应力、黏结强度、等效黏结强度、平均黏结强度、局部黏结应力为分析黏结性能的指标,利用电子万能试验机,研究不同纤维掺入类型、不同纤维掺入混合比与不同加载速率时纤维增强混凝土的黏结性能。试验证明:在混凝土内掺入端钩型钢纤维,可提升纤维增强混凝土的黏结性能,最佳纤维总掺入量为2%;添加混杂钢纤维的纤维增强混凝土,其黏结性能要优于单掺入端钩型钢纤维的纤维增强混凝土,最佳掺入混合比为端钩型钢纤维1%,平直型钢纤维1%,具有显著的纤维增强混凝土裂纹形成与扩展抑制作用;当混凝土等级相同时,加载速率越大,各黏性指标值越大,即黏结性能越优;当加载速率相同时,提升混凝土强度等级,可提升纤维增强混凝土的黏结性能,降低端钩型钢纤维对加载速率的敏感性。In order to study the bonding performance of fiber reinforced concrete,the tensile stress,bonding strength,equivalent bonding strength,average bonding strength,and local bonding stress are used as indicators to analyze the bonding performance.The electronic universal testing machine is used to study the bonding performance of fiber reinforced concrete with different fiber mixing types,different fiber mixing ratios,and different loading rates.The test shows that adding end-hook steel fiber into concrete can improve the bonding performance of fiber reinforced concrete,and the optimal total fiber content is 2%.The bonding performance of fiber reinforced concrete with hybrid steel fiber is better than that of fiber reinforced concrete with end hook steel fiber alone.The best mixing ratio is 1%for end hook steel fiber and 1%for straight steel fiber,which has significant inhibition effect on crack formation and propagation of fiber reinforced concrete.When the concrete grade is the same,the greater the loading rate,the greater the value of each viscosity index,that is,the better the bonding performance.When the loading rate is the same,increasing the strength grade of concrete can improve the bonding performance of fiber reinforced concrete and reduce the sensitivity of end-hook steel fiber to the loading rate.

关 键 词：纤维增强 混凝土 黏结性能 试验研究 拉应力 黏结强度 

分 类 号：TU528.572[建筑科学—建筑技术科学]