Influence of Blast Furnace Slag on Durability of High-Strength Concrete

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Title: Influence of Blast Furnace Slag on Durability of High-Strength Concrete

Author(s): Y. Sagawa, H. Matsushita, Y. Maeda, I Chikada, and S. Kaneyasu

Publication: Special Publication

Volume: 221

Issue:

Appears on pages(s): 703-720

Keywords: carbonation; chloride; deicing salts; ground granulated blast-furnace slag; high strength concrete; prestressed concrete; salt attack

Date: 5/1/2004

Abstract:
Although the water-cement ratio of concrete for the prestressed concrete is low, deterioration due to salt attack of prestressed concrete structures has appeared in recent years. Blast-furnace slag is effective in resisting penetration of chloride ions. However, the influences of blast-furnace slag on the durability properties of high-strength concrete for steam-cured pretensioned elements are not clear. In this study, carbonation and chloride penetration of the high-strength concrete using blast-furnace slag were examined. As the result, the addition of blast-fumace slag increased the concentration of chloride ion near the surface, but decreased the penetration to the interior concrete. Blast-furnace slag improved the resistance to erosion by a calcium chloride solution. Moreover, it was found that carbonation of the concrete made with blast-furnace slag was slow and there was no problem in this respect.