Journal of The School of Marine Science and Technology,Vol.6 No.1
Experimental study for the Non-destructive testing of the concrete in water
Shinya WATANABE, Shigemi SAKODA, Yoshimatsu TETSU and Akihito TAKEUCHI
Abstract
In Japan, modern engineering structures have begun to be built since the Meiji era. Concrete or iron and steel are used in these structures mainly. Although such concrete structures are a few, they are rather in use.However,it is known that the concrete may deteriorate when it is exposed to water. Therefore, that the concrete is exposed to deteriorate in long term under water environment.As a result appropriate repair and reinforcement actions must be implemented in order to prolong the serve life of structures and to sustain their sapid the in safety.It is necessary to understand the state of the concrete before repair and reinforcement. Many nondestructive testing methods are developed, and, the techniques for, investigation and check it are used for land concrete structures. However, the conventional techniques are not suitalde for structures under the water. Therefore we attempted to diagnosis the a nondestructive testing method for the concrete in the water in this study.The method we developed is a combination of rebound value and supersonic wave velocity.As a result,it was clarified that it is possible to estimate compressive strength of the concrete by waterproofness and pressure tightness to nondestructive testing device of the concrete
under water-environment.