Ultrasonic Pulse Velocity of Normal Aggregate Concrete and Lightweight Aggregate Concrete at Early age According to Elapsed Time

초기재령에서 보통골재 및 경량골재 콘크리트의 시간경과에 따른 초음파 속도 변화

Because of the problem of increasing self-weight due to the enlargement and high-rise of buildings using normal aggregate concrete, the need for structural lightweight aggregate concrete increases. However, early strength prediction is required when placing structural lightweight aggregate concrete, but research is insufficient. In this study, the ultrasonic pulse velocity of normal aggregate concrete and lightweight aggregate concrete was measured at early age. As a result, the ultrasonic pulse velocity of lightweight aggregate concrete was lower than normal aggregate concrete according to elapsed time at early age.