Abstract
In this study, to develop the non-destructive method for evaluating moisture content of concrete structures, fundamental study of application of terahertz radiation was conducted. The samples of hardened cement paste with three types of Portland cement and three different water to cement ratios were prepared. With the terahertz time-domain spectroscopy, dependency of frequency on the fraction transmitted and applicable scope are evaluated. As a result, it is experimentally confirmed that 0.1 and 0.05 THz are the better frequency for evaluating moisture content of hardened cement paste, and the scope and the method for evaluating water content in hardened cement paste are proposed with characteristic values. This proposed method can be applicable regardless of cement type and water to cement ratio.
