Influence of fly ash on the mechanical properties of frame concrete

Fly ash dumped not only consumes landfills, but also pollutes environment. With the aim of sustainable development, the isolated contribution of fly ash in concrete to the mechanical properties of frame concrete is investigated, and experiments were carried out over water–binder ratios ranging from 0.30 to 0.42 and fly ash–binder ratios from 0% to 30%, based on concrete framework model theory. The compressive and flexural strengths of frame concrete and corresponding mortar matrix were determined on 28 days, 56 days and 90 days. The 28-day compressive and flexural strengths of concrete and mortar matrix decreased with fly ash incorporation, and increased on 56 days and 90 days due to curing ages and pozzolanic reaction. It can be concluded that the optimum of fly ash is not a constant one but depends on the water–cementitious materials (w/cm) ratio of the mix. Based on the test results, concrete framework equation has been developed using statistical methods.