NDT test for concrete is to inspect the internal mechanical materials without damaging or affecting the performance of the object to be tested, without harming the internal organization of the object to be tested, using the internal structure of the material abnormalities or defects caused by changes in heat, sound, light, electricity, magnetism, and other reactions, physical or chemical methods as a means, with the help of modern technology and equipment and equipment, the internal structure and surface of the test piece, the state and type of defects The method of inspection and testing of the internal and surface structure, state and type of defects, number, shape, nature, location, size, distribution, and their changes.
Non destructive testing methods of concrete are a detection method, a monitoring tool, and a means of finding process defects, thus achieving the purpose of reducing costs and improving efficiency.
NDT test for concrete structures is a technique for direct quantitative testing of the strength and defects of concrete structural members in situ without damaging the concrete structural members. It mainly includes the rebound hammer method, ultrasonic rebound integrated method, local breakage method, and other nondestructive testing techniques. Compared with destructive testing, the above NDT methods have the following characteristics.
The first has a non-destructive nature because it does not damage the use of the object being tested when doing the test.
The second is comprehensive, because the test is non-destructive, so if necessary, the object can be tested 100% of the entire test, which can not be done by destructive testing.
The third has the whole process, destructive testing is generally only applicable to the detection of raw materials; and non-destructive testing because it does not damage the use of the object to be tested, so it can not only the raw materials, intermediate links, finished products for the whole process of testing, but also for the detection of equipment in service.
NDT is an essential and effective tool for industrial development, and its importance has been recognized. Since it is so important, is it true that all items tested by NDT are guaranteed to be qualified and will not cause problems during their service life?
The answer is obvious: Of course not!
First of all, different testing methods have their limitations, and we are often judged on the minimum requirements for use, and most importantly, NDT relies more on the experience and level of the inspector.
The real significance of NDT is not in the momentary detection, it is a complex cycle of the continuous improvement process. The problems exposed through testing are traced back to the production process that caused the problem, and the production technology is improved, then NDT is performed again, and then the process is improved .... So repeatedly until the pass rate is stabilized at a high base, thus achieving the effect of improving project quality and reducing costs.
NDT has its necessity in the design, manufacturing, and operation process, but NDT cannot be regarded as a mere inspection means, it is a means of monitoring the production-to-use process, and the use of NDT to find engineering defects is the most tremendous significance of the existence of NDT.