EFFECT OF TRANSIENT HIGH TEMPERATURE ON HEAVYWEIGHT, HIGH STRENGTH CONCRETE

Abstract eng:
As the use of special high strength concrete becomes necessary for special purpose, the risk of exposing it to high temperatures also increases. To be able to predict the response of structures employing special high strength concrete after exposure to high temperature, it is essential that the strength properties of special high strength concrete subjected to high temperatures be clearly understood. In the present work, 12 mixes were selected to achieve a slump above 100 mm and strength up to 140 MPa at 180 days. To achieve this a 0.24 water/cement ratio and 3.5% superplasticiser were used. The investigation used three levels of silicafume (0, 10%, 20% by weight of cement), two coarse aggregate proportions of total aggregate (0.48, 0.65 by volume) and both magnetite and natural sand fine aggregate were used. The effect of transient high temperature on strength of heavy weight high strength concrete was investigated. There were three exposure durations (0, 1hr, 2hrs.) at temperatures of 100, 300, 500 and 700 °C. As the temperature increased to 100 °C, the strength decreased compared to the room temperature strength. With further increase in temperature, the specimens recovered the strength loss and reached a peak strength of 10 to 30 % above the room temperature strength. At the temperature 500 and 700 °C, the strength in each case dropped sharply.

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