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

本研究考察了高炉水泥在港口结构中的有效性。为实现上述目标，进行了(1)高炉水泥港口钢筋混凝土结构现场调查，(2)普通硅酸盐水泥港口钢筋混凝土结构现场调查，(3)室内试验，(4)暴露试验。从研究结果来看，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。掺加高炉水泥的钢筋混凝土抗氯侵蚀的潜伏期和寿命分别是掺加普通硅酸盐水泥的2倍和4倍。认为这些影响是由高炉水泥混凝土的氯离子固定化和低氧渗透性提供的。

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.