Introduction of Revision of "Technical Specification for Testing Concrete Strength by Ultrasonic-rebound Combined Method"

In this article,the author introduces the content of revision of "technical specification for testing concrete strength by ultrasonic-rebound combined method".The strength curve of new specification adapts to age for 7～2?000 days,strength for 10～70MPa pumped concrete.The new specification adds angle monitor method and plane monitor method,which spread application scope and better coordinate with the correlation monitor specification.