Modelling the interaction between the atmosphere and curing concrete bridge decks with the SLABS model

Wojcik, Gary S.; Fitzjarrald, David R.; Plawsky, Joel L.

doi:10.1017/s135048270300207

Cited by 8 publications

(3 citation statements)

References 20 publications

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“…On the surface boundaries, solar radiation and convection need to be accounted for in the analysis. 24 This was accomplished by using ambient temperature, wind speed, and solar radiation values that were measured onsite during construction. The convection coefficient was calculated using Eq.…”

Section: Schmidt Methodsmentioning

confidence: 99%

Evaluation of Temperature Prediction Methods for Mass Concrete Members

2006

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Section: Schmidt Methodsmentioning

confidence: 99%

Evaluation of Temperature Prediction Methods for Mass Concrete Members

2006

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“…By increasing the length of Stage II with retarders, this problem can be avoided. For more details of cement and concrete chemistry, see Neville (1996), Taylor (1997), and Wojcik (2001).…”

Section: Energy Balances Of Curing Concrete Bridge Decksmentioning

confidence: 99%

Modelling the interaction between the atmosphere and curing concrete bridge decks with the SLABS model

Wojcik¹,

Fitzjarrald²,

Plawsky

2003

Meteorol. Appl

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The interaction between atmospheric and construction conditions and the exothermic, temperaturedependent hydration reactions of the concrete's binding components may produce adverse conditions in curing concrete, thereby reducing the quality of that concrete. Accurate model forecasts of concrete temperatures and moisture would help engineers determine an optimal time to pour, an optimal mix design, and/or optimal curing practices. Existing models of curing concrete bridge decks and road surface prediction models lack realistic boundary conditions. The concrete models contain unnecessarily detailed hydration heat generation mechanisms for a simplified field forecast model. In this paper, a new energy balance model (SLABS), which can be easily adapted to predict road surface conditions, is described and applied to predict the temperatures and moisture of curing concrete bridge decks made with New York State Department of Transportation's Class HP concrete. Highest concrete temperatures occurred at high air temperatures, humidities and initial concrete temperatures and at low cloud cover fractions and wind speeds. Peak concrete temperatures can exceed 60°C. To minimise concrete temperatures and temperature gradient magnitudes, concrete should be placed during the late afternoon or early evening. As a field forecast model for which the meteorological inputs are taken from NGM MOS forecasts, the outputs of SLABS include the peak concrete temperature (to within 2°C of the observed in one application), peak temperature gradient, evaporation rate at the time of placement and several warning messages indicating adverse field conditions.

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“…Most of the work reported has been done on horizontal surfaces, mainly bridge decks and pavements. [4][5][6] The boundary conditions of the concrete member are the most complex and variable portion of the heat transfer analysis. The modeling of the concrete heat exchange with the environment is dependent on the surrounding features such as walls and ground surfaces, formwork, curing blankets, ambient conditions, orientation of the element, and heat conduction from the concrete interior.…”

Section: Introductionmentioning

confidence: 99%