Effect of fly ash particle size on thermal and mechanical properties of fly ash-cement composites

Some tests were performed using the new products to find out their detailed properties including density, thermal conductivity, compressive tensile strength, and elasticity module and water absorption. It was found in the experiments that (i) as the grain size diameter decreased, ash density increased 16.12%, and porous structure was replaced by full-grain ash and its color turned to light brown; (ii) as the ash addition ratio increased 10-90% in fly ash cement mixtures, thermal conductivity coefficient and compressive strength values decreased in the rates of 14.47-24.52% and 1.25-9.4% respectively; (iii) concrete or plaster turned into an insulator due to fly ash.