摘要
为探明青海地区盐沼泽环境下混凝土的腐蚀情况,在该地区展开现场腐蚀试验,考虑混凝土不同埋置工况,观察其微观结构,并结合混凝土质量损失、抗侵蚀系数变化以及钢筋锈蚀率变化评价混凝土耐久性。试验结果表明:混凝土质量变化不能作为评价指标来描述混凝土的损伤破坏;对于放置在地面和埋置在水中的混凝土,当混凝土内掺有水泥基时,其抗侵蚀系数最高,而在埋深1.25 m工况下掺有粉煤灰-硅灰的混凝土抗侵蚀能力最强;混凝土的劣化是膨胀力、冻结应力、结晶应力等多重因素共同作用下的结果;放置在地面的混凝土锈蚀率最高,尤其是单掺水泥基的钢筋混凝土锈蚀率最高,而复掺粉煤灰-水泥基的混凝土锈蚀率最低。
Field corrosion tests were conducted in salt swamp environments in Qinghai Province to investigate the corrosion of concrete in the region.The microstructure of concrete was observed under different burial conditions,and the durability of concrete was evaluated by assessing the mass loss,changes in anti-corrosion coefficient,and changes in corrosion rate of steel bars.Results indicate that changes in the mass of concrete can not be used as an evaluation index to describe concrete damage.Embedded in the ground or water,concrete mixed with cement-based materials exhibits the highest corrosion resistance coefficient,while concrete mixed with fly ash-silica fume has the highest corrosion resistance when buried at a depth of 1.25 m.Concrete deterioration results from multiple factors such as expansion force,freezing stress,and crystallization stress.The corrosion rate of concrete embedded in the ground,particularly reinforced concrete mixed merely with cement base,is the highest.The corrosion rate of concrete with fly ash-cement base is the lowest.
作者
冯忠居
陈露
孔元元
王富春
陈慧芸
张聪
FENG Zhong-ju;CHEN Lu;KONG Yuan-yuan;WANG Fu-chun;CHEN Hui-yun;ZHANG Cong(School of Highway,Chang’an University,Xi’an 710064,China)
出处
《长江科学院院报》
CSCD
北大核心
2023年第5期166-172,共7页
Journal of Changjiang River Scientific Research Institute
基金
国家自然科学基金项目(41907236)
青海省交通科技攻关项目(2014-07)。
关键词
混凝土
耐久性
盐沼泽
腐蚀试验
concrete
durability
salt swamp
corrosion test
