A NONDESTRUCTIVE EVALUATION TECHNIQUE FOR ASSESSING QUALITY OF SURFACE CONCRETE BASED ON AIR PERMEABILITY CHANGE CHARACTERISTICS CONSIDERING ITS MOISTURE CONTENT DEPENDENT

Abstract

In the present paper, we examine a countermeasure method for nondestructive quality evaluation of surface concrete by using air permeability tests, which have a problem such as susceptibility to moisture content in concrete. The tendency of air permeability to increase with age of concrete until at least 6 months was shown on the exposure tests of concrete specimens with different W/C and demolding age to atmosphere under 20℃ and 60％rh. Clarifying insufficiency of the previous suggested method by Torrent et.al., we have proposed an original method considering the moisture content dependent of air permeability.