Technical lignosulfonates can be widely used as a correction additive in the keramzite gravel production.

Keramzite gravel is the most popular artificial porous filler of light and construction concretes, it is got by heave of loam by means of quick burning in the rotating ovens. Correcting additives, added in formulation of loam raw, let to intensify process of keramzit formation, to rise the raw bloating, to reduce firmness and rise durability of keramzit. Additive of sodium of lignosulfonate in the quantity of 12% of mass of absolutely dry raw loam lets to get hard granules of keramzit with reduced firmness 0,380,43 g/cm³.