A study on Bangladeshi fly ash as a partial replacement of ordinary Portland cement in concrete production using different water cement ratio

Fly ash is one of the most common residues produced from coal combustion. Unconditionally released fly ash into the atmosphere allowing environmental pollution. Subsequently, the new concern is to storage and recycling the alarming quantity of fly ash. Now a days, fly ash is become used as a supplementary cementitious material in concrete production and contributes on the hardened properties of concrete through pozzolanic or hydraulic activity, or both. But there is a huge research gap on Bangladeshi fly ash to use as a supplementary cementitious material in concrete production. From this perspective, our studies on Bangladeshi fly ash as a partial replacement of ordinary Portland cement in concrete production. The water cement ratio has a great impact on the strength of concrete. Here we used 0.4, 0.5 and 0.6 water cement ratio in concrete and try to find out the different character of concrete with different water cement ratio. A total of 27 cylinders of diameter 100 mm and 200 mm height with different percentages by weight of ordinary portland cement to fly ash as cementitious material in the order 100:0, 95:5 and 90:10 were cast, tested and their compressive strength were determined subjected to water curing for 28 days. From the experimental study, it can be concluded that Bangladeshi fly ash can used as supplementary cementitious material in concrete production successfully