Model for Early-Age Rate of Evaporation of Cement-Based Materials
Publication: Journal of Engineering Mechanics
Volume 138, Issue 11
Abstract
Early-age cracking affects the structural integrity of concrete structures and, if not inhibited, would lead to a reduction in service life. Plastic cracks are observed in the first few hours after placing the concrete, a time period well within the initial stages when the drying process is controlled by the rate of evaporation of concrete surfaces, which is roughly constant and similar to the rate of evaporation from water surfaces. In the absence of a theoretical method, this rate is commonly estimated using a nomograph based on Dalton’s law. In this paper, a fluid mechanics–based approach for water evaporation based on the boundary-layer theory, mass transfer, diffusion, and convection is described. A parametric study is conducted on the effect of boundary-layer temperature, wind speed, relative humidity, and evaporation characteristic length on the calculated evaporation rates. Predicted evaporation rates are verified by recent experiments. Results show that given appropriate environmental parameters, evaporation rates can be predicted with a good degree of accuracy.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 138 • Issue 11 • November 2012
Pages: 1372 - 1380
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Jun 7, 2011
Accepted: Mar 22, 2012
Published online: Mar 24, 2012
Published in print: Nov 1, 2012
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