Freezing and Thawing: Comparison Between Non-Air-Entrained and Air-Entrained High-Strength Concrete

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Title: Freezing and Thawing: Comparison Between Non-Air-Entrained and Air-Entrained High-Strength Concrete

Author(s): Y. LI, B. W. Langan, and M. A. Ward

Publication: Special Publication

Volume: 149

Issue:

Appears on pages(s): 545-560

Keywords: admixtures; air-entrained concretes; deicing; freeze-thaw durability; high-strength concretes; mortars (material); nonair-entrained concretes; pastes; voids; Materials Research

Date: 10/1/1994

Abstract:
The freezing and thawing (F/T) durability of nonair-entrained cement pastes and mortars was evaluated by measuring the decrease in compressive strength. At the water-cementitious ratio (w/c) of 0.24, both the paste and mortar showed excellent F/T resistance at 0, 5, and 10 percent silica fume levels. When the w/c was higher than 0.24, the paste and mortar durability were significantly reduced. The F/T durability of nonair-entrained concrete was determined according to ASTM C 666, Procedure A. At a w/c of 0.24, the nonair-entrained concretes were F/T-durable regardless of the silica fume and total cementitious content, but concretes with a w/c greater than 0.24 had better overall durability. The salt-scaling of nonair-entrained concrete at different w/c was tested according to ASTM C 672. No scaling was found in the concrete at w/c of 0.24 and 0.27. The results from the paste, mortar, and concrete showed that w/c was the most important factor in evaluating F/T resistance of these concretes.