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传统的检验结构物混凝土质量的方法是采用预留试件作破型试验。这种方法的最大缺陷是预留试件不一定代表真实情况。作为辅助方法,在结构物上凿(钻)取试样又较费工时,数量有限,且对结构物造成一定程度破坏。对于隐蔽在内部的缺陷,用上述方法无法检查,因此,有赖于无损检验技术。混凝土无损检验根据其探测原理和手段大致可分为表面硬度法、声学法、电磁法、放射
The traditional method of testing the quality of concrete structure is to use the reserved specimen for breaking test. The biggest drawback of this method is that the specimen is not necessarily reserved for the true situation. As an auxiliary method, it is more time-consuming and labor-intensive to drill (drill) the specimen on the structure, and the structure is damaged to a certain extent. Insofar as the internal defects can not be inspected with the above methods, it depends on the NDT technology. Nondestructive testing of concrete can be broadly classified into surface hardness method, acoustic method, electromagnetic method, radiation according to its detection principle and means