Designing Method of Anti-Neutralization for Vehicle Tunnel Lining Concrete

Abstract

The neutral erosion of lining concrete in vehicle tunnel under the condition of load and composite acid gases is noticeable. The anti-neutral analysis and prediction of an under-river tunnel lining concrete were discussed, and the neutral level was analyzed by a numerical way based on the effect of load level and composite acid gases. It was proposed that the anti-neutral level affected by moisture content exists a high and low range and the neutral depth increase with the increase of capillary porosity. Then the design method for highly anti-neutral lining concrete of vehicle tunnel was put forward based on the corrected carbonation depth. Finally the micro-structural parameters of highly anti-neutral lining concrete, such as moisture content, content of Ca(OH)2 and capillary porosity in concrete, were analyzed. The content of Ca(OH)2 was determined to be greater than or equal to the solubility of Ca(OH)2 under the condition of environmental temperature. The critical maximum connected capillary porosity was 9.15%. The research provides basis for the design and preparation of anti-neutral lining concrete of vehicle tunnel.