北方寒区市政道路混凝土护栏劣化机理及防护工艺  

Deterioration Mechanism and Protection Technology of Concrete Guardrail of Municipal Road in Northern Cold Region

作　　者：李红玉 Li Hongyu(Shandong Engineering Construction Standard Cost Center,Jinan 250031,China)

机构地区：[1]山东省工程建设标准造价中心,济南250031

出　　处：《黑龙江科学》2024年第8期28-31,共4页Heilongjiang Science

摘　　要：为准确评估冻融-氯盐耦合作用对市政道路混凝土护栏的影响,开展混凝土护栏劣化机理及防护工艺研究。挑选3种耐候、防冻涂料,制作4组普通混凝土试件及3组涂层混凝土试件,进一步开展冻融-氯盐耦合试验、饱水试验、RCM试验。结果表明,氯盐环境可以加速市政道路混凝土护栏内部钢筋锈蚀过程;盐冻环境下混凝土结构氯离子扩散系数呈非线性上升趋势,当冻融循环150次时,普通混凝土试件扩散系数提高173.06%;在有机涂层作用下,混凝土结构抗渗性能显著提高,当冻融循环150次时,抗渗性能分别提高37.45%、19.12%、44.78%,且硅烷2类涂料在试验及工程应用过程中均表现出较优的防护效果。对市政道路混凝土护栏进行涂装有机涂料处理可显著提高耐久性,有效延长护栏使用寿命,此结果可为类似工程的防护研究提供一定的参考。In order to accurately evaluate the influence of freeze-thaw-chloride coupling on concrete guardrails of municipal roads,the deterioration mechanism and protection technology of concrete guardrails are studied.3 kinds of weather-resistant and antifreeze coatings are selected to make 4 groups of ordinary concrete specimens and 3 groups of coated concrete specimens.The freeze-thaw-chlorine salt coupling test,saturation test and RCM test are further carried out.The results show that the chloride environment can accelerate the corrosion process of steel bars in the concrete guardrail of municipal roads;the chloride ion diffusion coefficient of concrete structure under salt freezing environment shows a nonlinear upward trend.When the freeze-thaw cycle is 150 times,the diffusion coefficient of ordinary concrete specimens increases by 173.06%.Under the action of organic coating,the impermeability of concrete structure is significantly improved.When the freeze-thaw cycle is 150 times,the impermeability is increased by 37.45%,19.12%and 44.78%respectively,and the silane 2 coatings show better protective effect in the process of test and engineering application.The organic coating treatment of municipal road concrete guardrail can significantly improve the durability and effectively prolong the service life of guardrail,which provides a certain reference value for the protection research of similar projects.

关 键 词：市政道路护栏 劣化机理 涂层 抗渗性 

分 类 号：U444[建筑科学—桥梁与隧道工程]