摘要
通过干湿循环腐蚀法分析不同类型C20混凝土经盐腐蚀后内部损伤变量的变化规律及损伤模型。试验结果表明:随着干湿循环次数的增加,损伤变量D经历了从负值至逐渐增加的过程;单掺矿物外加剂对抗腐蚀有利,单掺引气剂对抗腐蚀性不利,采用复掺能够改善单掺引气剂对抗腐蚀性不利的局面;基于损伤力学理论,根据受盐腐蚀混凝土的抗压强度试验结果,利用Matlab6.5软件回归分析方法,提出了计算腐蚀混凝土强度的数学模型,计算结果与试验结果有很好的吻合性。
Inner salt corrosion damage distribution and mechanics models of the different types of C20 concrete are studied by immersion-dry cycles.The results show that according to the immersion-dry cycles increased,the damage variable D experiences the process from negative to slow increasing; the compound mineral admixture improve the resistance to salt attack of concrete,but disbenifit for concrete with air-entrained agent.If these two substances are admixed at the same time,the resistance to salt attack of concrete is more favorable than concrete with air-entrained agent ; Base on the damage mechanics,a mathematic model is extracted to compute the compression strength of corroded concrete through the method of regression analysis by matlab 6.5 which is based on the experimental results. The result of computation and the result of experiment are the same.
出处
《中国建材科技》
2014年第4期19-21,共3页
China Building Materials Science & Technology
关键词
损伤模型
混凝土
干湿循环
引气剂
damage model
concrete
immersion-dry cycles
air-entrained agent
