Effect of soot pigment additive on properties of composite gypsum binder

The results of studies to increase strength and water resistance of gypsum materials due to the hydraulic complex, pozzolanic and ultradispersed additives are presented in the paper. The astringents compositions, consisting of gypsum, cement, microsilica, ultrafine carbon additive of universal pigment concentrate are developed. The average particle size of the carbon black is 150-180 nm. The addition of soot contributes to the hardening processes intensification of the gypsum cement-pozzolanic binder (GCPB) and leads to the formation of a more homogeneous and finely dispersed phase binders' structure. The additive use allowed the authors to improve the mechanical properties of the gypsum cement-pozzolanic binder and to increase the water resistance by the composite compacting structure. The compositions of lightweight concrete and light plaster solutions were developed on the basis of gypsum binder compositions.