TEKNIK DERGI, vol.18, no.2, pp.4145-4155, 2007 (SCI-Expanded)
In high temperatures, the mechanical properties of structural reinforcements are affected by concrete cover significantly. Three diametrically reinforcement bars were chosen, which are used commonly in RC buildings then these exposed to different high temperatures. Mortars to take cover are prepared using CEM I 42.5 cement and fly ash added to that in ratios of 10, 20 and 30 % of cement weight. S420 deformed steel bars with diameters of phi 10, 16 and 20 placed into formworks in special dimensions having cover thickness of 25 nm. After hardening specimens kept in standard water cure for 28 days. Then specimens laced into furnace in 20, 100, 200, 300, 500, 800 and 950 degrees C for 3 hours individually. Performing tension tests on reinforcements taken from cooled specimens, it is tried to determine the variations in yield and ultimate strength and in resilience of reinforcements due to same group of high temperatures.