Experimental study on water stability ofsoda residue composite soil for road use
Using soda residue to prepare soda residue composite soil for road use can recycle solid waste soda residue and reduce the cost of road building materials.However,the water stability of soda residue composite soil is very important for the performance of the material.In this paper,the unconfined compressive strength and water stability of soda residue composite soil under different soda residue content were tested,and the rule and mechanism of the influence of soda residue content on the water stability of soda residue composite soil were ana-lyzed.The results show that the moisture content of soda residue is higher and alkaline;The strength is low and it is not suitable for direct use as engineering soil alone.In the range of 0～4％soda residue content,both submerged UCS and unsubmerged UCS of soda residue com-posite soil samples increased first and then decreased for 7 days,and the strength and water stability coefficient reached the highest at 2％soda residue content.Therefore,the strength was the highest and the water stability was the best at 2％soda residue content,2％cement content and 2％lime content.Appropriate amount of soda residue in soda residue composite soil system mainly plays the role of micro-ag-gregate filling effect,hydration reaction to produce gelling,improve the density of materials,change the permeability of materials,and jointly improve water stability.However,the water strength and water stability of soda residue composite soil decrease due to excessive soda resi-due.The research results can provide reference for the recycling of soda residue in road field and the improvement of road material proper-ties.
Solid waste soda residueSoda residue composite soilUnconfined compressive strengthWater stability
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