公路隧道衬砌混凝土高抗中性化提升技术研究

Promoting Technology Study on High Anti-neutralization of Vehicle Tunnel Lining Concrete

公路隧道衬砌混凝土在承载和复合酸性气氛共同作用下的中性化侵蚀不容忽视。研究了江底公路隧道的抗中性化分析预测及公路隧道衬砌混凝土抗中性化的影响参数,并基于荷载水平和复合酸性气氛条件对衬砌混凝土抗中性化水平进行数值分析,提出了公路隧道衬砌混凝土的抗中性化提升技术;然后确定了公路隧道高抗中性化衬砌混凝土临界最大连通毛细孔隙率为9.15%,氢氧化钙含量至少要大于等于环境温度条件下的溶解度,并最终提出了公路隧道高抗中性化衬砌混凝土的设计方法及制备要点,从而为公路隧道抗中性化衬砌混凝土的设计和制备提供依据。

The neutral erosion of lining concrete in vehicle tunnel under the condition of comprehensive load and compound acid gases is noticeable. The anti-neutralization analysis and prediction of an under-river tunnel lining Concrete were discussed, and the neutral depth was modified based on the effect of load level and composite acid gas. Then the anti neutral level was analyzed by a numerical way. Furthermore, the technology of enhancing the anti-neutralization of vehicle tunnel lining concrete was put forward. Finally the micro-structure Parameters of high resistant neutral lining concrete were determined such as the limited capillary porosity not higher than 9.15% and the limited content of Ca （OH）2, and the design method and key points of preparation of the high anti-neutral lining vehicle tunnel concrete were proposed so as to provide basis for the design and preparation of anti-neutral vehicle tunnel lining concrete.