EXPERIMENTAL RESEARCH ON HIGH-PERFORMANCE CONCRETE TUNNEL LINING BASED ON COMPOSITE CEMENTITIOUS MATERIAL

After most of the mountain tunnels in China entered into service stage，all of them had different degrees ofdiseases． Especially when the tunnel was in an area with rich groundwater，serious cracks，leakage，dissolution andchemical etching occurred in the tunnel structures． The primary reason leading to the tunnel structure durabilitydeficiency is the poor property of the cementitious material which is basically composed of Portland cement，and theingredient of the cementitious material is very single，has poor grade and quality． Improving the performances of theraw materials is a radical method to solve the tunnel structure durability problems． So it was suggested that multiplecomposite cementitious materials should be used to prepare high-performance concrete，and separate grinding andcollective distribution should be used for the main powder materials of the composite cementitious materials． Theexperimental study show that the high-performance concrete，which is prepared by the composite cementitiousmaterials，has excellent work performance，mechanical property and durability，and at the same time it has thevirtues of energy conservation，environmental protection and cost reduction．