Abstract:

The analysis of various influencing factors of concrete carbonization is important to reduce the damaging effects of carbonization. The carbonization depth test on secondary lining of tunnels, piers, pile caps and abutment of bridges are carried out under low humidity condition in Northern Shaanxi Area. The relationships between concrete carbonization depth and concrete strength, concrete age, illumination and structural location under low humidity condition are analyzed. The concrete carbonization depth prediction formula in Northern Shaanxi Area is obtained as xc=0.312 51tand y=0.103t0.713. To improve the concrete compactness and provide a moderate high alkali environment, methods such as sealing the concrete surface and adjusting the mixing proportions of concrete materials are adopted, which can further reduce the concrete durability damage induced by concrete carbonization.

Key words: Northern Shaanxi Area, low humidity condition, concrete, carbonization, influencing factor