Effect of drying method on compressive strength of special concrete with bottom ash

摘要

From the electric coal power plant, the waste material that formed is the bottom ash and fly ash. Bottom ash is collected at the bottom of boiler or furnace and sometimes it is placed on the surface of the chamber in a water-filled hopper. High-pressure water is used to remove the bottom ash from the chamber. While, fly ash is disposed to atmosphere by tall chimney. 80% of product of electric coal power plant will become fly ash and remain 20% of product is bottom ash. The bottom ash is physically coarse, porous, light, glassy, granular, greyish and incombustible material that suitable used in concrete for civil engineering application. The type and properties of bottom ash produced depends on the type of boiler or furnace and also the sources of raw coal. With the chemical analysis and physical testing, the bottom ash show unique properties that can be applied in concrete. The study involved the high capacity oven and normal equipment for testing of concrete. The special concrete was produced by using bottom ash as sand replacement and checked their compressive strength. The compressive strength value is taken from the normal temperature and other exposed to 200°C. The concrete that been drying at 200°C were found as the superior in compressive strength followed by normal cure and drying for 100°C. This shows high temperature drying may produce higher early compressive strength.