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在美国佛罗里达州有超过1903km的海岸线,有将近3000座混凝土桥梁处在具有腐蚀性的水下环境中。处在这种情况下,混凝土中的钢筋表现出腐蚀的迹象大约在二三十年内。在近些年,佛罗里达交通部(FDOT)已经在16座桥梁上安置了阴极防腐系统来减少由于腐蚀引起的混凝土退化。这些阴极防腐系统包括外加电流和中和阳极系统。外加电流组包括(1)传导胶合正电极,(2)传导橡胶电极,(3)埋置在结构保护层和水泥砂浆中的钛网电极,(4)埋置在桩基础标注保护层中的钛网正极。中和部分包括(1)电弧喷镀锌阳极,(2)扩展锌片阳极,(3)浸在水中的大量的锌阳极,(4)埋置在桩基础标注保护层中的扩展锌网正极。文中描述了阴极防腐技术及其实际应用、安装和此系统作为控制水下环境中的混凝土基础结构腐蚀方法的性能。
Florida has more than 1903km of coastline and nearly 3,000 concrete bridges in a corrosive underwater environment. In this case, the reinforcement in concrete shows signs of corrosion in about two or three decades. In recent years, the Florida Department of Transportation (FDOT) has installed cathodic corrosion protection systems on 16 bridges to reduce concrete degradation due to corrosion. These cathodic protection systems include applied current and neutralization anode systems. The applied current group includes (1) a conductive glueing positive electrode, (2) a conducting rubber electrode, (3) a titanium mesh electrode embedded in a structural protective layer and cement mortar, (4) Titanium mesh positive. The neutralization section includes (1) an arc sprayed zinc anode, (2) an expanded zinc anode, (3) a large number of zinc anodes immersed in water, (4) an expanded zinc mesh embedded in the base of the pile foundation . The paper describes the cathodic corrosion protection technology and its practical application, installation and performance of this system as a method of controlling the corrosion of concrete infrastructures in underwater environments.