钢纤维长径比对C60混凝土抗裂性能的影响  

Effect of steel fiber's length-diameter ratio on anti-cracking property of C60 concrete

作　　者：梁少阳[1] 金宝宏[1] 姚宇峰[1,2] 李家俊 李晓路 LIANG Shao-yang;JIN Bao-hong;YAO Yu-feng;LI Jia-jun;LI Xiao-lu(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Department of Civil Engineering,China University of Mining and Technology Yinchuan College,Yinchuan 750021,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]中国矿业大学银川学院土木工程系,宁夏银川750021

出　　处：《广西大学学报（自然科学版）》2018年第2期641-647,共7页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(53168048)

摘　　要：为研究不同长径比对C60高强混凝土早期塑性开裂的影响,采用了四周约束平板法,完成了8个C60钢纤维混凝土试件,通过对裂缝的数量、面积和形态的统计观察,对其抗裂机理进行了探讨和分析。结果表明:钢纤维的掺入可有效减小C60混凝土早期塑性裂缝的面积、数量;长径比为50的钢纤维抑制效果最优;纤维长径比由25到75,其裂缝降低系数呈先增高后降低趋势,当长径比为50的钢纤维掺入时,钢纤维混凝土试件的阻裂效能等级为一级。研究结果可为钢纤维对高强混凝土抗裂性能影响的研究提供指导与借鉴。In order to study the effect of different length-diameter ratios of steel fiber on the early stage plastic cracking of C60 concrete,the method of quadrilateral plate constraint is used,and eight specimens of C60 steel fiber concrete are tested.The mechanism of cracking resistance is analyzed and discussed by the observation of number,size and shape of the cracks.The results show that the introduction of steel fiber can effectively reduce the area and quantity of early stage plastic cracks of the C60 concrete;that the steel fiber with the length-diameter ratio of 50 shows the most restraint on the early-age cracking;that the anti-cracking performance of the fiber increase first and then decrease when its length-diameter ratio is increased from 25 to 75.The results can provide guidance and reference for the research of steel fiber effect on the anti-cracking property of high strength concrete.

关 键 词：高强混凝土 钢纤维 长径比 塑性开裂 

分 类 号：TU528.572[建筑科学—建筑技术科学]