2012 Volume 68 Issue 3 Pages 146-156
In this study, a technique for estimating concrete strength and evaluating its resistance to freezing and thawing was developed by quantifying early defects and voids in concrete using contrast radiography, and the applicability of the technique was investigated. Tests have revealed that the void content of concrete determined by contrast radiography correlates well with its compressive strength and resistance to freezing and thawing. Application tests were also conducted using this technique to evaluate the properties of concrete in newly built concrete structures and determine the deterioration depth of concrete for aged deterioration, with its utility being verified. The results of evaluation by contrast radiography were compared with those by air permeability testing, which has been widely used in recent years, to elucidate their relationship, while clarifying the characteristic of measurement result by air permeability testing.
