Effect of Low Temperature on the Creep Behavior of High-Strength Concrete

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Title: Effect of Low Temperature on the Creep Behavior of High-Strength Concrete

Author(s): H. M. Marzouk

Publication: Special Publication

Volume: 135

Issue:

Appears on pages(s): 51-64

Keywords: creep properties; creep tests; fly ash; harbor structures; high-strength concretes; low temperature; offshore structures; silica fume; Materials Research

Date: 12/1/1992

Abstract:
In recent years, considerable attention has been given to the use of silica fume as a partial replacement for cement to produce high-strength concrete. The use of silica fume high-strength concrete offers great promise for marine structures and offshore platforms. Preliminary results of creep strain measurements for 24 specimens at temperatures of 20, 10, 0, -10, and -20 C are presented. At room temperature, three stress levels were applied to the concrete specimens ranging from 25 to 75 percent of the 28-day strength at room temperature. For specimens at temperatures of 10, 0, -10, and -20 C, one stress level of 50 percent of the 28-day compressive strength of the reference specimens was applied. The results of creep at low temperatures were compared to the corresponding results at room temperature. In general, the relation of creep to stress-strength ratio at room temperature was found to be linear for silica fume concrete as the case for ordinary portland cement concrete. Test results revealed that low temperature had a minor effect on the magnitude of creep strains at temperatures between -10 and -20 C. Based on the experimental results, a basic expression for creep of silica fume concrete is suggested. Discussion of a hypothesis of the creep mechanisms is presented.