QUANTIFYING MOISTURE AND CHLORIDE CONTENTS INCONCRETE USING SYNTHETIC

In civil engineering determining the subsurface moisture content the water-to-cement(w/c) ratio and chloride content of reinforced concrete (RC) structures in the eld is a challenging task. Moisture content of RC structures regards the cement hydration level and short-term strength development of concrete as well as the phase-distribution (solid gaseous liquid) inside concrete and its long-term durability. The presence of chloride ions in RC structures in addition to moisture leads to steel rebar corrosion. This thesis describes a new microwave nondestructive evaluation technique using non-contact/non-intrusive synthetic aperture radar (SAR) imaging to quantify the w/c ratio subsurface moisture content and chloride content of concrete panel specimens. Concrete panel specimens made of three w/c ratios (Z = 0.4 0.5 0.55) and six chloride contents (S = 0 2 4 6 8and 10% by cement wt.) at a w/c = 0.45 were air-dried for approximately f months and scanned by a laboratory 10-GHz SAR imaging system. Quantitative analysis of SAR images was carried out by the K-R-I transform to understand the simultaneous change of SAR amplitude and shape at different moisture levels.