Research on the resistivity of port & harbor RC structures using blast furnace slag cement against chloride attack

本研究探讨了高炉水泥在港口结构中的应用效果。为实现上述目标，进行了(1)高炉水泥港口钢筋混凝土结构的现场勘察，(2)普通硅酸盐水泥港口钢筋混凝土结构的现场勘察，(3)室内试验，(4)暴露试验。从研究结果看，混凝土中钢筋的氯离子扩散率和腐蚀速度很大程度上取决于水泥的种类。与普通硅酸盐水泥相比，高炉水泥混凝土的抗氯离子侵蚀潜伏期和使用寿命分别提高了2倍和4倍。认为这些效应是由于高炉水泥对氯离子的固结和混凝土的低透氧性所提供的。

This research investigated the effectiveness of blast furnace cement in port structures. In order to achieve the above objective, (1) field surveys of port RC structures with blast furnace cement, (2) field surveys of port RC structures with Ordinal Portland cement, (3) laboratory test, and (4)exposure test were conducted. From the results of this study, the chloride ion diffusivity and corrosion speed of steel bar in concrete were largely depending on the kinds of cements. The incubation periods and the lifetime of reinforced concrete with blast furnace cement was 2 and 4 times longer than that with ordinary Portland cement respectively against chloride attack. It was considered that these effects were provided by the chloride immobilization and low Oxygen permeability of concrete with blast furnace cement.