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Article

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

1
Department of Civil Engineering, Gaziantep University, Gaziantep 27310, Turkey
2
Department of Civil Engineering, Wasit University, Kut 52003, Iraq
3
School of Civil Engineering, SASTRA Deemed University, Thanjavur 613401, India
*
Author to whom correspondence should be addressed.
Academic Editors: Cesare Signorini, Antonella Sola, Sumit Chakraborty and Valentina Volpini
Crystals 2021, 11(8), 941; https://doi.org/10.3390/cryst11080941
Received: 14 July 2021 / Revised: 9 August 2021 / Accepted: 10 August 2021 / Published: 12 August 2021
(This article belongs to the Special Issue New Frontiers in Cementitious and Lime-Based Materials and Composites)
Portland cement concrete is known to have good fire resistance; however, its strength would be degraded after exposure to the temperatures of fire. Repeated low-velocity impacts are a type of probable accidental load in many types of structures. Although there is a rich body of literature on the residual mechanical properties of concrete after high temperature exposure, the residual repeated impact performance of concrete has still not been well explored. For this purpose, an experimental study was conducted in this work to evaluate the effect of high temperatures on the repeated impact strength of normal strength concrete. Seven identical concrete patches with six disc specimens each were cast and tested using the ACI 544-2R repeated impact setup at ambient temperature and after exposure to 100, 200, 300, 400, 500 and 500 °C. Similarly, six cubes and six prisms from each patch were used to evaluate the residual compressive and flexural strengths at the same conditions. Additionally, the scattering of the impact strength results was examined using three methods of the Weibull distribution, and the results are presented in terms of reliability. The test results show that the cracking and failure impact numbers of specimens heated to 100 °C reduced slightly by only 2.4 and 3.5%, respectively, while heating to higher temperatures deteriorated the impact resistance much faster than the compressive and flexural strengths. The percentage reduction in impact resistance at 600 °C was generally higher than 96%. It was also found that the deduction trend of the impact strength with temperature is more related to that of the flexural strength than the compressive strength. The test results also show that, within the limits of the adopted concrete type and conducted tests, the strength reduction after high temperature exposure is related to the percentage weight loss. View Full-Text
Keywords: repeated impact; ACI 544-2R; high temperatures; fire; residual strength repeated impact; ACI 544-2R; high temperatures; fire; residual strength
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MDPI and ACS Style

Al-Ameri, R.A.; Abid, S.R.; Murali, G.; Ali, S.H.; Özakça, M. Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures. Crystals 2021, 11, 941. https://doi.org/10.3390/cryst11080941

AMA Style

Al-Ameri RA, Abid SR, Murali G, Ali SH, Özakça M. Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures. Crystals. 2021; 11(8):941. https://doi.org/10.3390/cryst11080941

Chicago/Turabian Style

Al-Ameri, Raad A., Sallal R. Abid, G. Murali, Sajjad H. Ali, and Mustafa Özakça. 2021. "Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures" Crystals 11, no. 8: 941. https://doi.org/10.3390/cryst11080941

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