Effect of Condensed Silica Fume and Fly Ash on Compressive Strength Development of Concrete

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Title: Effect of Condensed Silica Fume and Fly Ash on Compressive Strength Development of Concrete

Author(s): Marit Ronne

Publication: Special Publication

Volume: 114

Issue:

Appears on pages(s): 175-190

Keywords: compressive strength; concretes; drying; fly ash; hardening; silica fume; Materials Research

Date: 5/1/1989

Abstract:
The effect of different curing conditions on the long-term compressive strength of concrete containing silica fume and fly ash was investigated. The project was carried out as a parallel test program at three different laboratories for a period of two years. Two mixes were chosen: one blended cement (MP30) containing 25 percent fly ash, and the other containing 25 percent fly ash and 10 percent silica fume. The cubes were exposed to six different curing conditions at different temperatures (20 to 70 C) and humidities (about 30 to 100 percent relative humidity). In one of the series, the cubes were allowed to dry on one side only. The compressive strength for both the cements containing fly ash and silica fume were sensitive to the early drying procedure. Good initial curing conditions in the first three days of curing gave an improvement in compressive strength compared to the samples dried immediately after demolding.