Experimental Study on New Composite Excited Lithium Slag-Based Curing Agent for Reinforcing Soft Soil
In order to improve the utilization rate of solid waste lithium slag,lithium slag was used as raw material,quick lime was selected as external additive,and calcium carbonate and sodium hydroxide were added as composite activators.A new type of soft soil curing agent material was developed by alkali excitation technology.The curing mix ratio of new composite excited lithium slag-based curing agent(CELS)was studied by orthogonal test,and the influences of various factors on the compressive strength of solidified soil were explored.At the same time,combined with XRD and SEM,the curing mechanism and microstructure evolution between curing agent and soft soil were revealed.The results show that the optimum mixture ratio of curing agent is 73％(mass fraction)of lithium slag,18％(mass fraction)of lime,9％(mass fraction)of composite activator,and the mass ratio of calcium carbonate to sodium hydroxide is 1∶1.Under this mix ratio,the unconfined compressive strength of solidified soil at 7 and 28 d is 1.32 and 2.35 MPa,respectively,and the water stability coefficient is 0.80 and 0.87,respectively.Under the synergistic effect of quicklime and composite activator,the cementitious materials such as calcium aluminosilicate hydrate(C-A-S-H)and sodium aluminosilicate hydrate(N-A-S-H)in solidified soil increase significantly,and the density of soil structure increases,thereby improving the strength and water stability of solidified soil.
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