Durability improvement of steel-making slag concrete

钢渣混凝土是以炼铁厂副产品高炉矿渣和铁水预处理渣为原料，经磨细后配制而成。这种建筑材料在日本被称为环保材料。研究表明，钢渣混凝土的强度取决于钢渣混凝土拌和后的pH值。由于铁水预处理渣中的氢氧化钙浸出，钢渣混凝土长期抗碳化和钢筋锈蚀性能较高。但是，钢渣混凝土的抗冻融性能较低。本文介绍了提高混凝土抗冻融性的方法。

Steel-making slag concrete is made of ground granulated blast furnace slag and hot metal pretreatment slag that are by-products at ironworks. This type of construction materials is called environmental conscious material in Japan. This study shows that the strength of steel-making slag concrete depends on pH of steel-making slag concrete after mixing. It also shows that the resistance to carbonation and steel rod corrosion of steel-making slag concrete is high for a long time due to calcium hydroxide leaching from hot metal pretreatment slag. However, resistance to freezing and thawing of steel-making slag concrete is quite low. In this paper, the method to enhance the resistance to freezing and thawing is shown.