Study on Characteristics of Ultrasonic Velocity for the Concrete under Stress

Abstract:

Cube concrete (150×150×150mm) of five ages (7, 14, 21, 28 and 35 days) under different stress conducted the ultrasound examination by non-metallic detector and universal testing machine. The results show that the relationship curve of the stress and the ultrasonic velocity can be divided into three stages, the smooth straight stage, the linear deceleration stage and the attenuation destruction stage from the load beginning to the ultimate strength for the same age. There is a growing trend about the ultrasonic velocity with the increase of the age to concrete samples of C10 and C20 in the same loading; however, the overall growth trend of the velocity is not obvious to concrete samples of C30, C35, C40 and C45. It also shows that the relationship curve of strength level and the velocity can be divided into two distinct stages, the sharply increasing stage (C10-C30) and the fluctuating stage (C30-C45). Simultaneously, the paper further illustrates and explains the reasons to appear these stages and the phenomena.

• Periodical: Applied Mechanics and Materials (Volumes 438-439)
• Pages: 220-223
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.438-439.220
• Online since: October 2013
• Authors: Ling Zhang, Chun Ling Yan
• Keywords: Compressed State, Concrete, Ultrasonic Velocity, Ultrasound Examination

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