11 Citations (Scopus)

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 mechanicsebased 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.

Original languageEnglish (US)
Pages (from-to)1372-1380
Number of pages9
JournalJournal of Engineering Mechanics
Volume138
Issue number11
DOIs
StatePublished - 2012

Fingerprint

Cements
Evaporation
Boundary layers
Concrete placing
Concretes
Nomograms
Structural integrity
Concrete construction
Service life
Water
Atmospheric humidity
Drying
Mass transfer
Plastics
Cracks
Fluids
Experiments
Temperature

Keywords

  • Boundary layer
  • Cement-based materials
  • Convection
  • Diffusivity
  • Evaporation
  • Mass transfer

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Model for early-age rate of evaporation of cement-based materials. / Bakhshi, M.; Mobasher, Barzin; Zenouzi, M.

In: Journal of Engineering Mechanics, Vol. 138, No. 11, 2012, p. 1372-1380.

Research output: Contribution to journalArticle

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AU - Mobasher, Barzin

AU - Zenouzi, M.

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AB - 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 mechanicsebased 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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KW - Diffusivity

KW - Evaporation

KW - Mass transfer

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