USE OF COAL WASTE AS FINE AGGREGATE ON PROPERTIES OF CONCRETE IN HOT WEATHER

Coal produces large amount of waste during the mining and processing stages, which is the residue of French colonialism of Algeria in the region of Bechar. This waste is dumped on to open land which creates a lot of environmental problems. The main objective of this study was utilization of Coal waste (CW) as a replacement for conventional natural fine aggregate in concrete. Conventional natural fine aggregate was replaced by coal waste aggregate in different percentages 0–6% by weight. This paper presents the results of a series of experiments conducted to investigate the effect of high temperature curing on concrete made with coal waste (CW). The curing temperatures adopted were 25 and 50°C.The experimental results suggest that high temperature cured CW concrete normally has a greater compressive strength than similarly cured control concrete. The concrete formulations were prepared with a constant water–cement ratio 0.51. It was observed in hot weather that the workability of concrete mixes containing coal waste aggregate and control concrete was 35-65% less than normal climate. The average compressive strength of all the concrete mixes containing coal waste (CW) aggregate increased by 6% and 5% at 7 and 28 days, respectively.