A Study of Residual Compressive Strength of Standard (M-30) and High Strength (M-60) Slag Cement Concrete Subjected to Elevated Temperatures
The IUP Journal of Structural Engineering, Vol. VII, No. 1, pp. 20-33, January 2014
Posted: 6 Jul 2017
Date Written: January 29, 2014
In the concrete composition, the state-of-the art additives like mineral and chemical admixtures are utilized in achieving High Strength Concrete (HSC). Better performance of concrete becomes inevitable in trying circumstances which led to the advent of HSC. Lot of care is required to be exercised in respect of high raised structures where occurrence of fire accident would be catastrophic in nature. The usage of Portland slag cement concrete in construction industry is making momentum globally due to its inherent advantage like sulphate and fluoride resistance. A study of comparison of the behavior of M-30 and M-60 slag cement concrete under fire exposed condition is preferred in the present paper. Tests were conducted to compare the behavior of M-30 and M-60 slag cement concrete at 28 days curing subjected to high temperature ranging from 100 to 500°C with respect to room temperature. The residual compressive strength of M-30 slag concrete exhibited marginal increase over M-60 from 100 to 500 °C. The range of increase is varied from 0.03% at 100 °C for 1 h to 0.72% at 500 °C for 3 h exposure. Similarly, the rebound value of M-30 was higher by 0.3 to 0.9% than M-60 at 100 °C for 1 h and 2.4 to 2.0% at 500 °C for 3 h exposure for stressed and unstressed conditions, respectively. Ultimately, M-30 concrete fared marginally better than M-60 at 28 days of curing. This may be due to the more water content present in M-30 than M-60 causing hydration of left out slag cement content under temperature exposed condition.
Keywords: Compressive Strength, Rebound Value, Water-Cement Ratio, Elevated Temperature, Air Cooling Method, Chemical Admixture, Crushing Strength, Failure Pattern
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