弯曲应力作用下钢纤维混凝土氯离子侵蚀性能  

Chloride Ion Corrosion of Steel Fiber Concrete under Bending Stress

作　　者：白敏[1,2] 蔡琳琳 牛荻涛[2] 陈华鑫[1] BAI Min;CAI Lin-lin;NIU Di-tao;CHEN Hua-xin(School of Materials Science and Engineering,Chang’an University,Xi’an 710064,China;School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]长安大学材料科学与工程学院,西安710064 [2]西安建筑科技大学土木工程学院,西安710055

出　　处：《硅酸盐通报》2019年第4期969-973,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划课题(2017YFB0309903-02);国家自然科学基金青年科学基金(51608041);2017年陕西省博士后科研项目(2017BSHEDZZ113);广东省交通运输厅科技项目(2016-02-003)

摘　　要：研究弯曲应力作用下钢纤维混凝土的氯离子侵蚀性能,分析了钢纤维掺量、弯曲应力水平对混凝土氯离子含量、氯离子扩散系数的影响规律。结果表明,钢纤维的存在能改善弯曲应力作用下的氯离子侵蚀性能,钢纤维掺量为1. 5%时,改善效果最明显。弯曲应力的存在加速了氯离子在钢纤维混凝土中的扩散速度、增大了混凝土氯离子含量,应力水平越大时影响越明显。钢纤维混凝土氯离子扩散系数与应力水平间存在指数型数学关系式,最终建立了钢纤维混凝土氯离子扩散系数随应力水平变化的数学模型。The performances of chloride ion corrosion of steel fiber concrete under bending stress were studied. The influence of steel fiber addition and bending stress level on chloride ion content and diffusion coefficient of concrete were analyzed. The results show that steel fiber can improve the performances and the improvement effect is most obvious with the steel fiber content is 1.5%. The diffusion rate of chloride ions in concrete is accelerated and the chloride ion content is increased under bending stress. It is found that there is an exponential mathematical relationship between chloride ion diffusion coefficient and stress level of steel fiber concrete. Based on the experiments and analysis, a mathematical model for the variation of chloride ion diffusion coefficient with stress level of steel fiber concrete is established.

关 键 词：钢纤维混凝土 弯曲应力水平 氯离子 扩散系数 

分 类 号：TU528[建筑科学—建筑技术科学]