Study on the corrosion resistance of early-strength coal gangue-based sprayed composite materials

On the basis of the basic performance research of gangue aggregate, the early strength sprayed composite material was prepared by using gangue to completely replace the aggregate and sulphoaluminate cement as the cementitious material, and its corrosion resistance was studied. The research results show that the early strength gangue-based sprayed composite material (RSCG) has good working performance. With the increase of corrosion time, the strength of RSCG gradually decreases. The main corrosion components are gypsum (CaSO4?2H2O) and calcium sulfonate. The expansion products are generated and expanded in smaller capillaries, which is the main reason for the generation and expansion of cracks. Based on the experimental research, the equation of the corrosion reaction of gangue-based sprayed composite material and the surface sulfate ion concentration equation are given.