Damage Performance Of Bridge Pier In Salinized Soil Area Of Delingha

With the wide application of concrete structures, concrete durability problems become more apparent, there are a lot of researches for concrete durability problem, but research findings and views of concrete corrosion in salt marshes have not yet unified.There are many corrosive salt in the salt marsh environment, and there are wet-dry cycles and freeze-thaw cycles,thus durability of concrete structures in western region is particularly complex problem, and it needs further study.In this paper, according to Dexiang highway, analyze its salt marshes along the soil,prepared the etching solution,according to the actual construction requirements, designed four kinds of concrete mix:reference concrete, mixed with 10% fly ash concrete, mixed with20% fly ash concrete and cement admixture of 1.5% CCSM concrete, combined with its cold and arid climate, design three indoor simulation experiments:long-term immersion test, salt corrosion-wet cycle test and salt corrosion-freeze-thaw cycle test, then we did three kinds of simulation experiment, the results show that concrete immersion corrosion is a long slow process. Concrete adding CCSM and fly ash can be improved resistance to salt corrosion-wet and dry cycles of destructive power. In the freeze-thaw cycle test, the composite salt thaw damage of concrete exist for promotion and inhibition, freezing point is very low in high concentrations of salt solution, thereby increasing the concrete frost resistance, CCSM concrete showed good salt freezing,fly ash concrete has poor salt freezing, and the greater the fly ash, salt freezing worse performance, different single salt solution concrete freeze damage in the form of different salts.