Creep and Shrinkage of High-Strength Concrete at Early and Normal Ages

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Title: Creep and Shrinkage of High-Strength Concrete at Early and Normal Ages

Author(s): N. Han and J. C. Walraven

Publication: Special Publication

Volume: 154

Issue:

Appears on pages(s): 73-94

Keywords: aggregates; creep properties; high-strength concretes; shrinkage; silica fume; stiffness; strength; stresses; Materials Research

Date: 5/1/1995

Abstract:
Presents the results of an ongoing experimental research program on creep and shrinkage behavior of high-strength concrete loaded at an early age (16 hours) and a normal age (28 days). The experiments were carried out on high-strength concrete with three types of aggregates (crushed gravel, granite, and limestone). The concretes were dried and loaded at ages of 16 hours and 28 days after casting. Loading levels with stress/strength ratios ranging from 0.15 to 0.70 were adopted in the experiments. The creep deformations were measured for a duration ranging from 90 to 210 days. The experimental results are compared in this paper with the predictions of CEB-FIP Model Code 1990, the modified MC90 model, and the model proposed by ACI Committee 209. The aging effect (in particular, at early ages) is emphasized and the influences of various factors on the aging effect are discussed.