关键词: 煤矸石, 压碎值, 耐水性, 液体强化剂, 包覆处理

Abstract:

The original coal gangue in Tongchuan,Shaanxi Province was taken as the research object.Through the processing of sorting,crushing and grading etc.,the experiments on chemical strengthening and surface coating of coal gangue were em-phasized.In this study,coal gangue with the particle size of 2.36~4.75 mm was selected.The strength and water resistance of coal gangue were improved with different strengthening agents and coated powder.It was found that when the solution was compounded with 0.7% soil solidified agent in a mass fraction of 6% silicate-based strengthening agent B,the strengthening effect on coal gangue was the most obvious.The surface of the coal gangue after liquid strengthening was covered with a mass ratio of cement to tailings powder of 1:1.2,The amount of coating was 25% of the mass of coal gangue.The dry crush value of the obtained product can be reduced by about 50%,the water resistance performance was improved by about 85%,and the produced coal gangue aggregate product performance was well.The coal gangue aggregate product was replaced by a part of the stone as a cement mortar aggregate.Compared with the original gangue cement mortar,the reinforced coal gangue cement mortar has improved flexural strength and compressive strength.

Key words: coal gangue, crushing value, water resistance, liquid strengthener, cover treatment