Abstract
The depth of crack in concrete structural elements can be measured using ultrasonic waves. One tool that can be used is PUNDIT. The research was conducted by measuring the depth of cracks on the concrete beam test object with a variation of the PUNDIT transducer distance. The purpose of this research is to determine the effect of the distance of the transducer (b) on the relative error (% error) measured in the cracked concrete depth. The results showed that the results of concrete crack depth measurements with the smallest relative error (% error) is obtained by adjusting the transducer distance to about 2/3 or 0.67 the thickness of the test object (h). At the distance of the transducer less than 0.67 or more than 0.67 the thickness of the test object, the relative error (% error) will be greater.
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