Experimental Study on Self Waterproofing Concrete of Tunnel Lining Structure
The comprehensive effects of microbeads(WZ),cement-based permeable crystalline water-proofing materials(CCCW),and high-performance expansion agents(HPCSA)on the compressive strength,impermeability,and shrinkage performance of self waterproofing concrete(TLSWPC)for tunnel lining structures were systematically studied through orthogonal experiments.The results show that the degree of influence on compressive strength is WZ>CCCW>HPCSA,and the optimal combination of compressive strength reaches 49.9 MPa,which is 33.1%higher than the benchmark concrete.The degree of influence on penetration depth is CCCW>HPCSA>WZ,and the optimal combination of penetration height is 40mm,which is 45.0%lower than the benchmark concrete.The degree of influence on drying shrinkage rate is HPCSA>WZ>HPCSA,and the optimal combination of 28 day drying shrinkage rate is 2.1×10-4,decreased by 67.7%compared to the C35 benchmark mix ratio.Using the comprehensive scoring method,A2B3C3 has the highest comprehensive score,the compressive strength grade meets the design requirements,and the penetration height and 28 day dry shrinkage rate are also at the optimal level,greatly improving the crack resistance and permeability of TLSWPC.
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