Resistance to Freezing-and-Thawing and Chloride Diffusion of Anti-Washout underwater concrete containing blast furnace slag

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Title: Resistance to Freezing-and-Thawing and Chloride Diffusion of Anti-Washout underwater concrete containing blast furnace slag

Author(s): K. Fukudome, K. Miyano, H. Taniguchi, and T. Kita

Publication: Special Publication

Volume: 132

Issue:

Appears on pages(s): 1565-1582

Keywords: blast furnace slag; chlorides; diffusion; freeze-thaw durability; marine atmospheres; porosity; tidal zone; underwater structures; Materials Research

Date: 5/1/1992

Abstract:
The resistance to freezing-and-thawing and chloride diffusion of antiwashout underwater concrete was investigated to evaluate the applicability for tidal zone in cold districts or reinforced concrete structures in marine environments. Comparisons were made with ordinary portland cement concrete of similar mix design. Two types of cement (ordinary portland cement and portland blast furnace slag cement) were used. Two types of blast furnace slag (Blaine fineness 500 and 700 m²/kg) were used as a cement replacement (slag content 30 and 50 percent by weight). The results show that antiwashout underwater concrete without blast furnace slag shows poor resistance to freezing-and-thawing compared with normal concrete. But the freezing-and-thawing resistance can be improved with blast furnace slag. This is due to the fact that concrete containing blast furnace slag has dense pore structures. Pore volume in the range of 10 to 10 3 nm in radius decreases significantly with blast furnace slag. Similarly, chloride diffusion depth becomes smaller with blast furnace slag.