Table of Contents
Journal of Computational Engineering
Volume 2014 (2014), Article ID 539850, 7 pages
http://dx.doi.org/10.1155/2014/539850
Research Article

Computational Model for Internal Relative Humidity Distributions in Concrete

Volgenau School of Engineering, Department of Civil, Environmental and Infrastructure Engineering, George Mason University, 4400 University Drive MS 6C1, Fairfax, VA 22030, USA

Received 15 December 2013; Revised 29 January 2014; Accepted 4 February 2014; Published 9 March 2014

Academic Editor: Fu-Yun Zhao

Copyright © 2014 Wondwosen Ali and Girum Urgessa. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A computational model is developed for predicting nonuniform internal relative humidity distribution in concrete. Internal relative humidity distribution is known to have a direct effect on the nonuniform drying shrinkage strains. These nonuniform drying shrinkage strains result in the buildup of internal stresses, which may lead to cracking of concrete. This may be particularly true at early ages of concrete since the concrete is relatively weak while the difference in internal relative humidity is probably high. The results obtained from this model can be used by structural and construction engineers to predict critical drying shrinkage stresses induced due to differential internal humidity distribution. The model uses finite elment-finite difference numerical methods. The finite element is used to space discretization while the finite difference is used to obtain transient solutions of the model. The numerical formulations are then programmed in Matlab. The numerical results were compared with experimental results found in the literature and demonstrated very good agreement.