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Studies on Durability and Deterioration of Reinforced Concrete Structures in Okinawa -Investigation of Existing Structures, 2-

机译:冲绳县钢筋混凝土结构的耐久性和劣化研究-现有结构的研究2-

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摘要

Continued from the previous paper,the results of investigation of the reinforced concrete bridges in Naha-City and Ishigaki-Island are reported in this paper. Some other reinforced concrete structures are also examined. Carbonation tests and Chrolide content tests of the samples from existing reinforced concrete structures throughout Okinawa have been carried on. Based on this and the previous site investigations, including the above room test results, the followings are to be mentioned: 1. The deteriorations of reinforced concrete structures in Okinawa-prefecture due to steel bar corrosion are so prevailing, their degrees so serious and their speeds so rapid, that some protective measures must be taken promptly. 2. The great majority of existing bridges in this prefecture has been injured in some degree, and half of them are deteriorated hadly. 3. The main cause of the deterioration is salt included in concrete. 4. There are three major origins of the salt above: sand from seashore and sea, mixing water, and direct intrusion of salt water into concrete. 5. Direct intrusion of salt water into concrete after setting is most prominent effect on the salt content and consequently the deterioration of reinforced concrete structure.
机译:接续前文,报道了那霸市和石垣岛的钢筋混凝土桥梁的调查结果。还检查了其他一些钢筋混凝土结构。冲绳县内已有钢筋混凝土结构的样品已进行了碳化和氯化物含量测试。在此基础上和先前的现场调查(包括上述室内测试结果)中,应提及以下内容:1.冲绳县钢筋混凝土结构因钢筋腐蚀而引起的劣化如此普遍,程度严重且严重。速度如此之快,以至于必须立即采取一些防护措施。 2.该县现存的绝大部分桥梁都受到了一定程度的伤害,其中一半严重受损。 3.劣化的主要原因是混凝土中包含的盐。 4.上面盐的三个主要来源:来自海边和海洋的沙子,混合水以及盐水直接侵入混凝土中。 5.凝结后盐水直接浸入混凝土中对盐分含量的影响最为显着,因此会破坏钢筋混凝土结构。

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