表面磨损与碳化作用下船闸混凝土耐久性研究  

Study on the durability of ship lock concrete under the action of abrasion and carbonization

作　　者：韩雪松 钱文勋 葛津宇 胡家宇 章陶然 HAN Xuesong;QIAN Wenxun;GE Jinyu;HU Jiayu;ZHANG Taoran(Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水利水运工程学报》2023年第3期75-83,共9页Hydro-Science and Engineering

基　　金：国家重点研发计划资助项目(2021YFB2600704)。

摘　　要：船闸混凝土在涨水期受船体摩擦碰撞及船行波冲蚀磨损,落水期受空气中CO_(2)的侵蚀。采用水下钢球法模拟涨水期船闸混凝土的物理磨损,结合快速碳化试验模拟落水期的CO_(2)侵蚀,研究船闸混凝土的性能退化规律。根据船闸设计服役指标和通航量确定表面磨损和碳化时长,以及二者的交替循环机制,宏观上通过碳化深度和抗冲磨强度反映船闸混凝土的工程性能退化规律,微观上基于热重法和压汞法表征船闸混凝土的成分和孔结构演化。结果表明,表面磨损作用会加速碳化反应,表面磨损和碳化循环作用机制符合内河船闸混凝土实际破坏情况。In the actual working conditions,the concrete of the ship lock is affected by the friction and collision of the ship’s hull and the erosion and wear of the ship’s traveling wave during the rising water period,and is damaged by CO_(2) in the air during the falling water period.In order to study the performance degradation law of the ship lock concrete under this working condition,the underwater steel ball method was used to approximate the physical wear of the ship lock concrete in the rising water period,and the rapid carbonation test was used to simulate the CO_(2) erosion in the falling water period.The duration of abrasion and carbonization,as well as the alternate cycle mechanism,is determined according to the design service index of the lock and the characteristics of navigability.The engineering performance degradation law of the ship lock concrete is reflected by the carbonation depth and anti-abrasion strength,and the composition and pore structure evolution of the ship lock concrete are characterized based on the thermalgravimetric analysis and mercury intrusion porosimetry.The simulation test and analysis show that the abrasion accelerates the carbonization reaction to a certain extent.The mechanism of abrasion and carbonation cycle is consistent with the actual failure of the inland ship lock concrete.

关 键 词：内河船闸 混凝土 表面磨损 碳化 耐久性 碳化系数 等效模拟 

分 类 号：TV43[水利工程—水工结构工程]