Drill several cores at different ages of the early age concrete, then measure its flexural strength, take this flexural strength as the anti-cracking limits.

Through resilience and core sampling drilling, we have examined the concrete intensity and the degree of carbonization and evaluated the safety of the upper part of an integrated building.

Nondestructive detection and core sample detection show that the unit weight, porosity and permeability of the core are in accord with the design requirement.