CORROSION INVESTIGATION OF FOUR BRIDGES BUILT BETWEEN 1973 AND 1978 CONTAINING EPOXY-COATED REINFORCING STEEL
CORROSION INVESTIGATION OF FOUR BRIDGES BUILT BETWEEN 1973 AND 1978 CONTAINING EPOXY-COATED REINFORCING STEEL
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1973 年至 1978 年建造的四座含有环氧树脂涂层钢筋的桥梁的腐蚀调查
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
M. Sherman
中科院分区：
文献类型：
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作者：
P. Krauss;D. Mcdonald;M. Sherman
Wiss，Janney，Elstner Associates，Inc.对四个桥面上环氧涂层钢筋的性能进行了深入的实地调查。该研究包括两个甲板上建造的钢梁和两个预制混凝土梁。两层甲板上覆盖了一层2英寸的。低滑塌覆盖层这些桥梁都是在1973年至1978年之间建造的。进行了目视裂纹和分层调查。钻取芯样以测定氯化物浓度并检查嵌入的钢材。进行了极化电阻、半电池和交流阻抗测量，但没有得出结论。需要进一步发展。实验室测试包括涂层检查、漏涂和厚度测试、涂层附着力测试和底膜污染。没有覆盖层的甲板在顶杆水平附近的氯化物水平足以腐蚀黑色钢或环氧涂层钢中的受损部位。有覆盖层的甲板的氯化物含量要低得多。氯化物在裂纹位置非常高，导致一些环氧涂层钢筋和一些小的分层区域发生严重腐蚀。在环氧涂层钢的制造和安装过程中改进质量控制的重要性显而易见。建议对没有覆盖层的甲板进行一些维护。
Wiss, Janney, Elstner Associates, Inc., performed an in-depth field investigation into the performance of epoxy-coated reinforcing bars in four bridge decks. The study included two decks built on steel girders and two built on precast concrete girders. Two decks had been overlaid with a 2-in. low slump overlay. The bridges were all built between 1973 and 1978. Visual crack and delamination surveys were performed. Core samples were drilled for determination of chloride concentrations and to examine the embedded steel. Polarization resistance, half-cell, and AC impedance measurements were taken, but were not conclusive. Further development is needed. Laboratory testing included inspection of the coating, holiday and thickness tests, coating adhesion tests, and underfilm contamination. The decks without overlays have chloride levels near the top bar level sufficient to corrode black steel or damaged sites in epoxy-coated steel. The decks with overlays have much lower chloride contents. The chloride was very high at crack locations causing significant corrosion of some epoxy-coated bars and a few small delaminated areas. The importance of improved quality control in manufacturing and installation of epoxy-coated steel is evident. Some maintenance of the decks not having overlays is recommended.