Study of structural features and properties of composite cement-ash binders based cement stone

The article presents the studies results of the cement stone structure from composite binder (KV) based on Portland cement CEMI-42.5N (GOST 31108-2020) and hydraulically removed ashes from the Novo-Irkutsk Thermal Power Plant (hereinafter referred to as HRA). The HRA and cement stone (CS) structural characteristics are presented. The characteristics are obtained with the following methods of analysis: X-ray structural and X-ray fluorescence; TGA-thermogravimetric and petrographic, scanning electron microscopy (SEM). The dependences of the cement tile strength on the ratio of the binder components and their specific surface area, Ca(OH)2 content in the cement stone and chemically bound water have been established. It is shown that an increase in the HRA specific surface area relative to Portland cement increases the cement stone compressive strength (of all KV compositions), due to its pozzolanic activity. The HRA specific surface area priority over the Portland cement specific surface area allows make a favorable forecast of the developed binders economic efficiency since the HRA grindability is much higher than that of Portland cement, which significantly reduce energy consumption for grinding. That is why the developed KV compositions can be recommended for commercial concret and mortars production to be used in the construction complex of the Irkutsk region.