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A NON-DESTRUCTIVE ESTIMATION ON ENGINEERING PORPERTIES OF SLAG CONCRETE BEAMS AFTER ELEVATED TEMPERATURE

In this study, the slag is selected to replace cement content with three mixture proportions, 0, 10, and 30%, in concrete beams exposed to one-sided specific elevated temperatures, 400, 600, and 800 o C, respectively, in a furnace. The effects on the resistance to fire damage are investigated by using ultrasonic pulse velocity, micro-hardness, splitting tensile strength, and moisture absorption tests. In all concrete beams, when the measurement distance from heating source increases, the measured temperature decreases and ultrasonic pulse velocity (UPV) increases. Similar linear relations between temperature and ultrasonic pulse velocity in all concrete beams represent an insignificant effect of slag replacement. A reliable ultrasonic pulse velocity lower bound is 1,860 m/sec for predicting engineering properties based on a 10% tolerable statistical scattering range and lower various experimental results. Using non-destructive testing to estimate the engineering properties in concrete can conduct a testing advantage with more economical expenditure and more convenient performance over conventional destructive testing. The resulting engineering properties, micro-hardness, splitting tensile strength, and moisture absorption content of concrete, are in term of ultrasonic pulse velocity. The gradually degenerated engineering properties can be estimated by measuring the ultrasonic pulse velocity on concrete after elevated temperature.