Ultrasonic pulse velocity method is widely used to evaluate the internal condition of concrete without loss of the structural integrity. In this study, the specimens were made for the varying the lightweight fine aggregates replacement rate of 0, 50, 100%. These specimens were used to measure the ultrasonic velocity and maximum frequency were analyzed. As Lightweight fine aggregates substitution rate was increased, the ultrasonic velocity and the maximum frequency bandwidth were also increased

• 유경석(서경대학교 도시환경시스템공학과 석사과정) | Yoo, Kyung Suk
• 김지상(서경대학교 토목건축공학과 교수) | Kim, Jee Sang Corresponding Author