The Proposal and Evaluation of Concrete Strength Estimation by
Rebound Hammer
By A. Shiba, S. Ishikawa, S. Watanabe and H. Kawakami
Concrete Jornal, Vol.43, No.2, Feb. 2005
- Synopsis
- The rebound number were measured by rebound hammer for the specimen made under various conditions, and concrete strength estimation was proposed by examining the relationship btween the rebound number and compressive strength of them. The effect of the carbonation and between the rebound number and the static modulus of elasticity, the ultrasonic pulse velosity and the surface moisture of concrete were examined too. In addition, the rebound number was measured by rebound hammer for large scale or real scale concrete specimens, and the application of concrete strength estimations was evaluated. As the results of the examinations, it was confirmed that the carbonation had as very large effect on the rebound number. It was also shown that concrete strength estimation could be applied enough for the concrete at ages less than about 56days.
- Keywords:
- rebound hammer, rebound number, concrete strength estimation, carbonation, large scale concrete specimens
