The use of raw and calcined diatomite in cement production

Abstract

In this research, the use of raw and calcined diatomite which is in amorphous and porous nature was investigated in cement production . The physical, chemical, mineralogical, micro-structural and mechanical tests of the mortars, prepared by mixing Portland cement clinkers with 5%, 10% and 20% raw and calcined diatomite (w/w) and gypsum were carried out. According to the test results, raw diatomite blended cements have produced comparable strength values with respect to the reference cement (OPC) up to 10% addition; increased additions resulted in decreases in the strength due to the higher water demand related to the porosity while Blaine values and reactive SiO 2 content were increased. Calcination changed the porous structure of diatomite and eased the grindability as well as providing it to be used as a cement addition at a higher rate of 20%.