Creep of Concrete Containing Fly Ash and Superplasticize at Different Stress/Strength Ratios

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Title: Creep of Concrete Containing Fly Ash and Superplasticize at Different Stress/Strength Ratios

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

Publication: Journal Proceedings

Volume: 83

Issue: 4

Appears on pages(s): 668-673

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

Date: 7/1/1986

Abstract:
Investigates the influence of different stress/strength ratios on the creep of unsealed and sealed concrete containing Saskatchewan lignite fly ash and admixtures of water reducer, air entrainment, and superplasticizer. The results were compared with a similar mix that did not contain any admixtures except air entrainment. The creep strain was measured at different stress/strength ratios of IO, 20, 30, 40, 50, and 60 percent, for a maximum period of 112 days. AN the tests were carried out at room temperature of 70 F (21.1 C). Creep was found to vary linearly with logarithm of time for both sealed and unsealed concrete. Also, creep was found to be a linear function of stress/strength ratio between 10 and 60percenf, and creep of unsealed concrete with admixtures was about 72 percent larger than that of plain concrete. Similarly, the creep of unsealed concrete with admixtures was about 4.21 times larger than the creep of the same sealed concrete.