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THE INFLUENCE OF THE ATMOSPHERE ON CURING CONCRETE TEMPERATURES AND MATURITY

Gary S. Wojcik, NIST/NRC Post-doctoral Research Associate
National Institute of Standards and Technology
100 Bureau Drive Mailstop 8615
Gaithersburg, MD 20899
T: 1-301-975-8514; F: 1-301-990-6891; E: gwojcik@nist.gov

ABSTRACT

The SLABS model for the simulation of curing concrete bridge decks was developed with new boundary condition formulations that can accurately account for a wide variety of atmospheric conditions, addressing limitations of previous studies. Equivalent ages, estimated from the temperature predictions of SLABS, can vary up to 40 h over the conditions simulated after 24 h of hydration. Depth variations of equivalent ages reach 15 h.

• Introduction
• Analytical Investigations with the Slabs Model
• Governing Equations
• Boundary Conditions
• Boundary Condition Sensitivity Studies
• Results
• Equivalent Age Sensitivity to Atmospheric Conditions
• Vertical Profiles of Equivalent Ages
• Summary and Conclusions
• Acknowledgements
• References