Creep and shrinkage prediction model for analysis and design of concrete structures: Model 83-short form

Abstract

A simple model for the characterization of concrete creep and shrinkage in design of concrete structures is proposed. It represents a shortened fom1 of model B3 which was presented in [2] (as and improvement of the original version [3]) and appears in this volume, and an update of a previous short form [ 4]. The main simplification compared to model B3 comes from the use of the log-double-power law as the basic creep compliance function. The B3 formulae for predicting material parameters in the model are simplified by dropping the dependence of these parameters on the composition of concrete mix, leaving only dependence on the strength and the specific water content of the concrete mix. The model is justified by statistical comparisons with all the data in the internationally accepted RILEM data bank. The differences between the present short-form and model B3 are discussed and limitations of the short form are compared to model B3 are noted. The model is suitable for design of concrete structures with the exception ofhighly creep-sensitive structures for which the full model B3 is necessary.