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Home  >  Volume 31 (July 2015)

Effect of High Temperature on the Residual Strength Properties of Concrete by R. I. Umasabor and O.E. Alutu (pages 167-172)
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The purpose of this work is to determine the effect of high temperature on the residual strength properties of concrete. The cement used for this work was Ordinary Portland cement of grade 42.5 meeting the requirement of type 1 cement. The fine aggregate and coarse aggregate used to produce concrete were all obtained from Benin City, Edo state, Nigeria. Sieve analysis was carried out for the fine aggregate. Water/cement ratio of 0.55 were used to produce a total of 84 samples of 100mm x 100mm concrete cubes for grade 30 (C30) concrete design mix. The samples were exposed to high temperatures of 3000C to 8000C for one (1) hour in a muffle electric furnace. The results obtained at 28days for230C, 3000C, 4000C, 5000 C, 7000C and 8000C  are 38.2N/mm2, 35.0N/mm2, 32.9N/mm2, 30.9N/mm2, 24.7N/mm2, 17.2N/mm2 and 10.6N/mm2 respectively. The percentage reduction of the compressive strength from 230C to 8000C is 27.7%. These depict that concrete compressive strength reduces to 27.7% when exposed to high temperature of 8000C for one hour.