Materials science

Mortar

Pozzolanic activity

Pozzolan

Organic chemistry

Portland cement

Cement

Fly ash

Composite material

Chemistry

Pozzolanic reaction

Chemical composition

Compressive strength

Construction and Building Materials

The effect of the chemical composition of the amorphous and crystalline phases of fly ash on the compressive strength of fly ash cement mortar was studied. The fly ash cement mortars were made by replacing 25 wt% of cement with 16 types of fly ashes, and the specimen’s compressive strengths were evaluated. The compressive strength increased with the mortar’s age due to differences in pozzolanic reactivity. The effects of various chemical parameters of the fly ash were analyzed. The pozzolanic reaction of fly ash was significantly affected by SiO2, Al2O3, and Fe2O3 components, which form the framework of the glass phase, and CaO, MgO, Na2O, and K2O components, which depolymerize the glass structure.

Effects of chemical composition of fly ash on compressive strength of fly ash cement mortar