Performance of Slag-Based Geopolymer Flow Shield-Cured Soil
In order to achieve the resource utilization of high moisture content shield soil in underground engineering and explore the feasibility of using geopolymer materials to solidify shield soil,this paper adopts slag-base geopolymer to solidify shield soil.By studying the influences of alkali activator modulus,mineral ratio,alkali activator dosage and temperature on unconfined compressive strength and engineering performance of different types of shield-cured soil,the design of cured soil mix proportion was determined.The influence of geopolymer content on water stability of cured soil was studied.Microscopic analysis of shield-cured soil using SEM to reveal the solidification mechanism.The results show that under the proposed water solid ratio in the test,the two kinds of fluid shield-cured soil with different soil properties have good mechanical and engineering properties.The aggregate of slag base produces amorphous gel,which enhances the cementation and compactness between soil particles.The unconfined compressive strength of shield-cured soil with 22％dry soil mass as cementing agent can reach 5.38 MPa in 28 d under standard curing,8.08 MPa under 40 ℃ curing,and the water stability coefficient can reach 0.98.
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