混凝土冻融损伤厚度的超声波检测  

Ultrasonic detection of freeze-thaw damage thickness of concrete

作　　者：张峰[1,2] 蔡建军 李树忱[1] 牛平霞[1] 李守凯[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061 [2]旧桥检测与加固技术交通行业重点实验室,北京100088 [3]山东高速青岛发展有限公司,山东青岛266100

出　　处：《深圳大学学报（理工版）》2012年第3期207-210,共4页Journal of Shenzhen University(Science and Engineering)

基　　金：国家教育部高等学校博士学科点专项科研基金资助项目(20100131120042);旧桥检测与加固技术交通行业重点实验室(北京)开放课题资助项目(2010-1027)~~

摘　　要：为分析混凝土结构的冻融损伤厚度,采用快冻法进行引气混凝土试验梁在质量分数为3.5%的NaCl溶液中的盐冻试验.基于超声脉冲检测方法,依据波速在不同物质中的传播速度差异,对冻融300次后的混凝土试块进行超声检测,得到混凝土冻融损伤厚度.结果表明,该配合比对应的混凝土试块在冻融循环300次后冻融厚度约为30 mm,未超过混凝土结构的钢筋保护层厚度.In order to analyze freeze-thaw damage thickness of concrete structure, the salt frost test of the concrete beam which was immerged in 3.5 % NaC1 salt solution was made by a quick freezing method. Based on ultrasonic detection methods, non-metallic ultrasonic instrument was used according to the propagation speed difference of wave velocity in different materials. The thaw cycles. The results show that, the damage thickness of the concrete specimen was detected after 300 freeze- damage thickness of concrete specimen after 300 times freeze-thaw cycles is 30 mm, which is less than the protective layer of reinforcements.

关 键 词：混凝土 盐冻 冻融厚度 快冻法 超声检测 应力波 钢筋保护层 

分 类 号：TU528.1[建筑科学—建筑技术科学]