CEMENT EXPANSION AGENT BASED ON HIGH-CALCIUM FLUE ASH Russian patent published in 2025 - IPC C04B18/08 C04B111/34 

FIELD: construction materials.

SUBSTANCE: invention relates to construction materials and specifically to compositions of additives for producing expanding and non-shrinking cement and making concrete and mortar based thereon. Cement expansion additive contains high-calcium flue ash and a water-soluble reagent. Water-soluble reagent used is calcium nitrate in amount of 5-15 wt.% of the weight of the flue ash.

EFFECT: realizing the purpose of the disclosed expanding additive, which enables to control shrinkage of concrete and cement mortar and obtain both non-shrinking and expanding concrete and mortar; disclosed expansion additive reduces shrinkage of concrete and cement mortar, and its use is economically beneficial due to content of a secondary spent component – flue ash.

3 cl, 2 tbl, 8 dwg