Concrete Creep and Shrinkage Prediction from Short-Term Tests

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Title: Concrete Creep and Shrinkage Prediction from Short-Term Tests

Author(s): Rasko P. Ojdrovic and Mehdi S. Zarghamee

Publication: Materials Journal

Volume: 93

Issue: 2

Appears on pages(s): 169-177

Keywords: concretes; creep properties; deformation; quality control; shrinkage; statistical analysis; tests; Materials Research

Date: 3/1/1996

Abstract:
This paper presents a method for predicting the ultimate creep and shrinkage from the results of short-term standard creep and shrinkage tests on 15-cm-(6-in.)-diameter cylinders. Short-term tests are defined as those performed during a time period not exceeding 28 days after exposure. The paper uses both Bazant-Panula (BP-KX) and ACI 209 (ACI) models to predict the ultimate concrete creep and shrinkage from the short-term test results. Such predictions are compared with the results of long-term creep and shrinkage tests. Results show that the accuracy of prediction of the ultimate creep and shrinkage increases significantly when short-term test results are used to adjust the models. Relative to both test-adjusted BP-KX and ACI model predictions, the coefficient of variation of long-term measured shrinkage strains is less than 20 percent, and the coefficient of variation of long-term measured instantaneous plus creep strains is typically less than 7 percent.