EFFECT OF THE KINDS OF CEMENT AND DEICING AGENT ON SCALING OF CONCRETE

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  • コンクリートのスケーリング劣化に及ぼす凍結防止剤の種類とセメントの種類の影響

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Recent efforts to reduce the burden on the environment have directed our attention toward the use of deicing chemical in preventing the corrosion of steel and of blended cement used for concrete, and the use of deicing chemicals for this purpose has now started. This study compares how the degree of scaling deterioration varies according to the types of cement and deicing chemicals used. The types of cement used were ordinary portland cement, fly ash cement, and blast-furnace slag cement, while the types of deicing chemicals used were chlorides and acetates. The result of this research is as follows. While no scaling was observed on the surface for the specimens filled with pure water, scaling was found to be promoted by all of the types of deicing chemical solutions used. Calcium magnesium acetate is considered less likely to cause scaling with concrete, while potassium acetate and sodium chloride cause considerable scaling deterioration. The amount of scaling and the process of scaling varied according to the type of cement；this is believed to have been a result of the hydration process experienced by the cement and admixture materials. The degree of scaling deterioration experienced with each of the types of deicing chemicals is likely to be affected by the strain generated at the boundary between the concrete surface and the ice.

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