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The Evaluation of Compressive Strength in Cement Mortar using Electromagnetic Properties  

Kim, Dong-Baek (Department of Civil Engineering, Hankyong National University)
Kwon, Seung-Jun (Department of civil and Environmental Engineering, University of California)
Publication Information
Journal of the Korean Society of Safety / v.23, no.3, 2008 , pp. 51-57 More about this Journal
Abstract
NDT(Non-Destructive Testing Evaluation) using electromagnetic(EM) properties can be used for evaluation of physical performance in cement-based materials. In this study, a technique for strength evaluation in cement mortar is proposed through the measured EM properties(conductivity and dielectric constant). For this research, cement mortar specimens with 5 W/C ratios are made for evaluation of compressive strength and they are also utilized for tests of EM properties in the range of $0.2{\sim}20GHz$ frequency considering exposure condition and curing period. The averaged conductivity and dielectric constant in $5{\sim}20GHz$ frequency are reduced to $83{\sim}93%$ and $81{\sim}87%$, respectively with increasing water to cement ratios. Through the linear regression analysis, relationships between EM properties and results from the compressive strength are obtained, which shows higher correlated factor($0.93{\sim}0.94$) in the specimens exposed to room condition. The gradients in dielectric constant for strength results is measured to be higher than those in conductivity by $3.9{\sim}5.1$ times. The results from dielectric constant in room condition shows the most efficient relation for evaluation of strength.
Keywords
electromagnetic properties; conductivity; dielectric constant; compressive strength; cement mortar;
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