Study on the curing effect of cement-based curing agent on residual mud
The waste slag produced during the construction of subway and the residual mud formed by the separation and pressure filtration of shield mud are major industrial solid waste.In order to realize the resource utilization of residual mud,the curing effect of two ce-ment-based curing agents on residual soil with different moisture contents was studied and the curing mechanism of the curing agents was analyzed.The results showed that class Ⅰ cu-ring agents cured mainly through the cementation and agglomeration of soil particles by C-S-H gel and calcium alumina crystals.The unconfined compressive strength of the cured residual mud was high,up to 15.01 MPa.Class Ⅱ curing agents cured mainly through the filling effect of C-S-H gel,Ca(OH)2 and CaCO3 on the soil structure,and the water resist-ance of the cured residual mud was good.The cured strength of residual mud increases with the increase of cement content;the optimal ratio of curing agents exists under different water contents;when the water content is 20％,the class Ⅰ curing agent with 10％cement dose is economical and effective;when the water content is 25％—35％,the class Ⅰ curing agent with 12％cement dose has the best effect.
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