CTI provides Party A's full-process quality control related concrete compressive strength testing (core drilling method) services. Concrete core drilling is the main damage detection method for measuring the concrete compressive strength. It can be used to determine the estimated value of concrete compressive strength of the test batch or individual component, and it can also be used to modify the converted value of concrete compressive strength obtained by the indirect strength test method by the core-drilling correction method. The measured strength of concrete is the key factor and key parameter for determining and evaluating the performance of concrete structures and components.