Experimental Evaluation Method of Carbonation in Concrete Structure Using Nonlinear Resonant Ultrasonic Spectroscopy

Carbonation is a typical type of concrete deterioration that can cause various physicochemical changes and adversely affects the performance reinforced structures, particularly in offshore structures. Nonlinear resonant ultrasonic spectroscopy (NRUS), which non-destructive test technique, applied this study to experimentally evaluate degree carbonation without damaging structure. Nonlinearity parameters specimens exposed accelerated conditions are measured via NRUS. The nonlinearity indicate lower values for longer durations. This because internal microcracks reduced by CaCO<sub>3</sub>, product. consistent trend experimental results shows NRUS be effectively carbonation.