THE SULFURIC ACID RESISTANCE OF CONCRETE WITH BLAST FURNACE SLAG

The deterioration of concrete by sulfuric acid attack in sewage environments has become a serious problem. In this study, it was shown that the resistance to sulfuric acid of mortar and concrete can be improved by using a blast-furnace slag fine aggregate to the total amount of fine aggregate. When mortar or concrete reacts to sulfuric acid, dihydrated gypsum film is formed around the particulate of the fine aggregate. This dihydrated gypsum film could retard the penetration of sulfuric acid, thus improving the resistance to sulfuric acid. However, the resistance to sulfuric acid depends on the hardness of the dihydrated gypsum film

Strength and Durability of Concrete with Blast Furnace Slag

The properties of concrete using blast furnace as binder and fine aggregate have been investigated in this study. The experiments focus on the properties of concrete such as compressive strength and young's modulus, carbonation, diffusion of chloride ions, resistance to sulfate attack and resistance to freeze and thaw. The experimental results show that when blast furnace slag is used in concrete, it improves the durability properties of concrete. However, the combination of using both blast furnace slag as binder and fine aggregate shows a greater improvement of those properties of concrete

Effect of Blast Furnace Slag Sand to Durability of Concrete

本研究は，高炉スラグを用いたコンクリートの中性化，耐硫酸塩性および凍結融解 抵抗性の検討を行ったものである．高炉スラグを細骨材に用いることで，細骨材周辺に集 積する水酸化カルシウムがなくなり，骨材表面とペーストとの界面が強固なものとなるた め，コンクリートの中性化および耐硫酸塩性が向上する．また，結合材の一部を高炉スラ グ微粉末に置き換えるか，または，細骨材に高炉スラグ細骨材を用いたコンクリートでは， AE 剤を用いることなく，また，蒸気養生を行っても，十分な凍結融解抵抗性が得られる