关键词: 碱性激发剂, 尾矿库, 旋喷施工, 凝结时间, 抗压强度

Abstract: High pressure jet grouting technology applied to the seepage prevention and reinforcement of tailings pond bottom has advantages on the convenient construction and lower cost.Different water-solid ratios and tailings content are chosen to simulate rotary jet grouting process parameters and evaluate of the feasibility of replacing cement with solid waste-based cementitious materials by measurement of setting time and compressive strength.Moreover,the coagulation acceleration effect and mechanism of NaAlO2 on the mortar were studied.The research results showed that the slag and steel slag cement glue tailing sand has excellent compressive performance,but the setting time is too long.NaAlO2 is an effective setting time regulator.When the water-solid ratio is set to 0.3 and the tailings content is 60%,the optimal amount of NaAlO2 is 0~1%.The initial setting time can be reduced to 4~8 hours.The NaOH and Al(OH)3 gel produced by the hydrolysis of NaAlO2 increases the alkalinity of the system,and promotes the formation and staggered growth of AFt and C—S—H,thereby accelerating the solidification of the body hardens and shortening the setting time.

Key words: alkaline activator, tailings pond, jet grouting, setting time, compressive strength