Effect of compressive stress in concrete on ultrasonic pulse velocity

Chong, Chooi Yeng. (2010) Effect of compressive stress in concrete on ultrasonic pulse velocity. [Final Year Project Report] (Unpublished)

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Abstract

This report presents a study on the effect of incremental compressive stress in concrete on the measured ultrasonic pulse velocity (UPV). In this study, a total of 60 cube samples were made from four different grades of mix proportions, which is grades 25, 30, 35 and 40. The cubes test was supposedly to be carried out at age 28 days. Due to the PUNDIT equipment breakdown, thus the tests were carried out at age 60 days. The specimens were subjected to monotonic axial loading in stages until failure while UPV values were recorded. Changes in the amplitude, velocity, and frequency contents of the pulses were correlated to the increasing levels of stress. Results show that the dramatically change of UPV values for concrete specimen under incremental loading for grades 25 and 30 happen at 0.30 stress/strength ratio. Grade 35 concrete shows decrease in UPV values. Whereas, the grade 40 concrete having a increased of UPV values throughout the test. The test of stress/strength ratio only can be carried out in 0.35 and 0.30 for grade 35 and 40 respectively. This is due to the limitation of the hydraulic jack.

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