Studying Some Properties of High Strength Concrete After Exposure to Elevated Temperature
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– The aim of this research is study of the effect of elevated temperature on high strength concrete properties. An experimental investigations were conducted on four types of high strength concrete mix (N, NS , NSF 0.25P, NSF 0.5P) For all mixtures five groups of the cubes specimens with dimensions (150×150×150 mm) for compressive strength test and cylinders’ specimens with 150mm diameter and 300mm high for splitting tensile strength were prepared, after concrete curing for 28 days first group of specimens for all mixtures considered as a control sample which was tested with out exposure to heating and others groups of specimens had exposures to temperature (200Cº, 400Cº, 600C°, 800C°) for one hour by using electrical oven, then all specimens were tested and the comparison were conducted on the results of compression strength, splitting tensile strength and ultrasonic pulse velocity. Experimental result indicated that, the high temperature has adversely effected on the properties of concrete with variable ratio depended on temperature level. Adding of fiber by 0.25% of the volume of concrete has improved the strength of concrete at high temperature especially when temperature was greater than 600°C
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