Abstract
A new semiempirical creep and shrinkage model is proposed wherein basic creep, drying creep, and drying shrinkage are all considered to age according to solidification theory. Applied to basic creep, this proposed formulation results in a closed-form expression for the compliance function when using two different volume growth functions: one approximating typical strength gain of concrete, and a second matching the slower aging from the B4 model. Drying shrinkage and drying creep, which is treated as a load-induced shrinkage, are combined into total drying strains while still accounting for aging through solidification. The model for drying strains satisfies all asymptotic conditions required by diffusion analysis. Approximations appropriate for design purposes are proposed for the drying strains, and the associated creep and shrinkage strain rates also are provided. The proposed model was compared with measured experimental data and contrasted with the B4 model.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The following data are available: reported creep and shrinkage data from the NU database (Hubler et al. 2015a) with modifications and corrections as discussed in the text; fits of the proposed model to these data; spreadsheets used to evaluate the proposed model by numerical integration and by its closed-form equations or approximations where appropriate; and data points that may be used to recreate all figures.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 7 • July 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 12, 2019
Accepted: Jan 2, 2020
Published online: Apr 27, 2020
Published in print: Jul 1, 2020
Discussion open until: Sep 27, 2020
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