混凝土桥梁防撞墙表面涂层防护体系性能研究(下)

A Study on the Performance of Surface Coatings Protection Systems for Concrete Bridge Anti-collision Walls(Ⅱ)

针对混凝土桥梁防撞墙极易受外界复杂腐蚀环境影响并造成严重损伤问题。本研究以“底漆+中间漆+面漆”的复合涂层体系作为设计方案,分别采用3种水性和3种高固体分溶剂型混凝土表面复合防护涂层体系。根据相应标准分别对它们进行了系统性评价研究。结果表明,高固体分溶剂型复合涂层体系综合性能普遍优于水性体系,其更适用于相对湿度较大的工业、海洋大气以及除冰盐或高盐土等强腐蚀环境,水性体系则适用于相对湿度适中的乡村、城市以及工业大气等轻中腐蚀环境。另外氟碳复合涂层体系综合性能优于丙烯酸或丙烯酸聚氨酯体系,其更适用于南海高温高湿高光照以及西部高原大温差强紫外等严酷复杂环境。

In view of the problem that concrete bridge anti-collision walls are easily affected by the complex external corrosive environment and cause serious damage,in this study,the composite coatings system of “primer+intermediate coat+top coat” was used as the design scheme,and three waterborne and three high solids solvent-based composite protective coatings systems for concrete surfaces were used respectively.According to the corresponding standards,the comprehensive properties of them were systematically evaluated and studied.The results show that the comprehensive performance of high solids solvent-based composite coatings systems is generally better than that of waterborne systems.They are more suitable for high corrosion environments such as industrial and marine atmospheres and deicing salt or high saline soil with high relative humidity,while waterborne systems are suitable for light and medium corrosion environments such as rural,urban and industrial atmospheres with moderate relative humidity.In addition,the comprehensive performance of fluorocarbon composite coatings systems is better than that of acrylic acid or acrylic polyurethane systems.They are more suitable for harsh and complex environments such as high temperature,high humidity and high lighting over the South China Sea and great temperature difference and strong ultraviolet on the western plateau.