Experimental Study on Disintegration of Strongly Weathered Granular Granite Cemented by MICP in the Seawater Environment
The Microbially Induced Calcite Precipitation(MICP)grouting technique was conducted to ce-ment strongly weathered granular granite,and the influence on physical and mechanical properties and dis-integration characteristics of specimens after being cemented with different cementing solvents,cementitious concentrations,and rounds of grouting cycles in the seawater environment was analyzed.The results showed the physical and mechanical properties and disintegration resistance of the strongly weathered granular gran-ite were distinctly improved after being cured by MICP;meanwhile,when seawater was used as cementing solvents,the cementitious effect for specimens was better than that in freshwater,and its unconfined com-pressive strength,calcium carbonate content,dry density and disintegration resistance were higher than those in freshwater.In addition,with the increase in the cementitions concentration,unconfined compres-sive strength,calcium carbonate content and dry density of specimens tended to first increasing and then decreasing,simultaneously,the final disintegration ratios of specimens tended to first decreasing and then increasing.The optimum cementitious concentration was 0.75 mol/L.The calcium carbonate content and unconfined compressive strength of cured specimens increased with the increase in rounds of grouting cycles and the final disintegration ratios were gradually decreased in the optimum cementitious concentration solu-tion;the maximum value of unconfined compressive strength of specimens after 4 rounds of grouting cycles was up to 9.38 MPa,and the disintegration ratio was only 1.5％.
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