Shrinkage and Creep of Concrete Containing 50 Percent Lignite Fly Ash at Different Stress-Strength Ratios

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Title: Shrinkage and Creep of Concrete Containing 50 Percent Lignite Fly Ash at Different Stress-Strength Ratios

Author(s): K. W. Nasser and A. A. Al-Manaseer

Publication: Special Publication

Volume: 91

Issue:

Appears on pages(s): 433-448

Keywords: age-strength relation; concretes; creep properties; creep tests; curing; fly ash; shrinkage.

Date: 2/1/1986

Abstract:
A study was conducted to find the shrinkage and creep of sealed and unsealed concrete made with Type I cement and containing 50% Saskatchewan fly ash. The tests were carried out at different stress/strength ratios and creep was measured at those ratios of: 10, 20, 30, 40, 50, and 60% and for a maximum period of 112 days. All the tests were carried out at room temperature of 70°F (21.4OC). Experimental results showed that creep of concrete made with 50% fly ash was a linear function of stress/strength ratio. The shrinkage of this concrete was about 11% higher than that of plain concrete, while its creep was lower by about 13% for the unsealed specimens and 39% for the sealed ones. In addition, the ratio of creep values of unsealed/sealed concrete was about 2.44 for plain concrete and 3.67 for concrete with 50% fly ash.