隧道衬砌混凝土抗硫酸盐侵蚀耐久寿命预测模型研究  

Durability Prediction Model for Tunnel Lining Concrete Under Sulfate Corrosion

作　　者：王海彦[1] 仇文革[2] 杜立峰[1] 龚伦[2] 

机构地区：[1]石家庄铁路职业技术学院,石家庄050041 [2]西南交通大学交通隧道工程教育部重点实验室,土木工程学院,成都610031

出　　处：《现代隧道技术》2014年第3期91-97,共7页Modern Tunnelling Technology

基　　金：铁道部科技研究开发计划项目(2009G005-E);河北省教育厅重点资助课题(ZD2014093);国家自然科学基金项目资助(51178399)

摘　　要：文章通过对硫酸盐侵蚀机理的分析,得出了自然劣化衰减方程;并根据规范中规定的混凝土强度耐蚀系数低于75%时混凝土寿命到期的基本原则,建立了混凝土抗硫酸盐侵蚀的耐久寿命预测模型;同时选取主要参考点建立了硫酸根质量浓度、水胶比、矿物掺合料掺入种类和掺量,以及不同养生方式的影响系数函数。综合考虑这些因素对衬砌混凝土耐久性的影响,得出了混凝土抗硫酸盐侵蚀的寿命预测方程,并对各种胶凝材配方混凝土的耐久寿命进行了预测。预测结果表明,多元复掺胶凝材对混凝土的抗硫酸盐侵蚀具有良好的效果,考虑多因素的混凝土寿命预测模型简单实用。A natural deterioration attenuation equation was derived by analyzing the mechanism of sulfate corrosion, and a model for pr-dicting concrete durability under sulfate corrosion was established considering the definition of concrete durability set forth in specification, i.e. the concrete life is expired if the corrosionresistance coefficient of the concrete strength is less than 75%. The functions of such influence coefficients as the sulfate mass concentration, water-cement ratio, mineral admixture species and dosages, as well as different curing methods, were set up by choosing some key reference points. Finally, an equation of concrete durability prediction under sulfate corrosion was obtained, and the durability of concrete prepared by various cementitious materials was predicted. The results show that the composite cementitious material has a positive effect in terms of sulfate corrosion resistance. This confrere durability prediction model, which takes various factors into consideration, is easy and practical.

关 键 词：隧道 衬砌混凝土 硫酸盐侵蚀 劣化曲线 寿命预测模型 

分 类 号：U454[建筑科学—桥梁与隧道工程] TU528[交通运输工程—道路与铁道工程]