Effect of High Temperatures on Fire Resistance of Concrete Containing Ground Bagasse Ash

Abstract

This research was to study the properties of fire resistance of concrete with bagasse ash at different temperatures. Designed compressive strength of control concrete at 28 days was 300 kg/cm². Bagasse ash from sugar mills was improved quality by burning at a temperature of 400 ºC and ground to a particle size retaining on standard sieve No. 325 less than 5% by weight to replace Portland cement type I at the rate of 0, 10, 20, and 30 by weight. Casting the cylindrical sample was cured at 90 days and then tested for strength before and after burned at 200, 400, 600, and 800 °C for 1, 2, 3, and 4-hour, respectively.

            The results showed that the compressive strength of concrete after burning depend on the temperature, the period of burning and replacement of ground bagasse ash. The temperature and period of burning increase while compressive strength of concrete declines. Use of ground bagasse ash as an ingredient in concrete, can improve the strength and fire resistance of concrete in all temperatures. The optimum usage of ground bagasse ash for the higher compressive strength of concrete before burning was 10% replacement which its compressive strength increased 12% of control concrete. For fire resistance, the optimum usage was 20% replacement which provided the higher compressive strength about 10% of control concrete after burning.