混凝土硫酸盐腐蚀层厚度的超声对测法研究  

Ultrasonic opposite testing method for measuring sulfate corrosion thickness of concrete

作　　者：杜健民[1] 李再婷[1] 于贵霞[1] 姬永生[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院江苏省土木工程环境灾变与结构可靠性重点实验室,江苏徐州221116

出　　处：《混凝土》2015年第10期52-55,共4页Concrete

基　　金：国家自然科学基金项目(51178455);国家"863"计划课题(2012AA06A402)

摘　　要：利用无损检测的方法快速准确的测量混凝土硫酸盐腐蚀层的厚度对于评价混凝土的腐蚀程度是至关重要的。利用应变等效性假说推导出超声对测混凝土腐蚀层厚度的"Vs-Va"方法。并且通过两种不同配合比的混凝土试块进行了为期270 d的硫酸盐腐蚀试验,在不同的腐蚀龄期分别利用超声对测法和强度退化法进行腐蚀层厚度的测量,通过两种方法测量结果的对比可以看出,随着腐蚀龄期的增大,超声对测法得到的腐蚀层厚度随时间的发展趋势与强度退化法一致,并且各龄期这两种方法得到的腐蚀层厚度值较接近,从而验证了超声对测法测量混凝土腐蚀层厚度的可行性。Measure sulfate corrosion thickness fast and accurately with non-destructive testing method is essential to evaluate the degree of concrete corrosion.We deduce＂Vs-Va＂method to corrosion thickness of concrete tested by ultrasonic opposite testing method based on the strain equivalence hypothesis.Adopt concrete with two different mixture ratio, sulfate corrosion test lasting 270 d is done, then measure corrosion thickness of concrete by ultrasonic method and strength degradation method in different ages.Experimental comparison results show that as corrosion time goes on,whether ultrasound opposite testing method or strength degradation method, the value of corrosion thickness measured shows the same tendency and the values of the two methods are closer, thus proving the feasibility of ultrasonic measurement method to test corrosion thickness of concrete.

关 键 词：混凝土 硫酸盐腐蚀 超声对测法 腐蚀层厚度 

分 类 号：TU528.01[建筑科学—建筑技术科学]