Abstract
Concrete in the structures undergoes the environmental effect of changing weather during its life span and carries a certain minimum load. Some concrete structures suffer from damage due to weather effects of the environment at early age. Environmental effect with age on concrete specimens of different grades under loaded and unloaded conditions has been studied using; ultrasonic pulse velocity, rebound hammer, and crushing strength. A systematic planned experimental study (using ultrasonic pulse velocity and rebound hammer tests) has been conducted on unloaded and loaded concrete with 20% of expected crushing strength. The results of ultrasonic pulse velocity and rebound hammer obtained from concrete specimens of different strengths and ages have been correlated with their compressive strength. The experimental test results indicate that the pulse velocity response of concretes of different ages with regards to NDT and crushing strength show that lean mixes respond poorly under unloading and loading conditions. It can be also concluded that the average value of rebound hammer under loading and unloading conditions do not show a clear decreasing/increasing trend with increasing age. Based upon the experimental results it may be concluded that concretes of lower grades respond poorly with age due to environmental effect.
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Paktiawal, A., Alam, M. (2021). A Study of Non-destructive Test (NDT) Results on Old Concrete Specimens Under Loaded and Unloaded Conditions and Their Crushing Strength. In: Emamian, S., Adekunle, T., Nangkula, U., Awang, M. (eds) ICSDEMS 2019. Springer, Singapore. https://doi.org/10.1007/978-981-15-3765-3_7
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DOI: https://doi.org/10.1007/978-981-15-3765-3_7
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