Concrete Maturity Method Using Variable Temperature Curing for Normal-Strength Concrete Mixes. II: Theoretical Study
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Volume 20, Issue 12
Abstract
Variable curing temperatures were used to simulate the condition of how mass concrete cures and how temperature affects strength development. For normal-strength portland cement concrete, higher curing temperature during the early age yields lower strength at a later age compared with an initial lower early-age curing temperature. Experimental work in all phases of this research clearly shows a crossover effect. However, results for maturity analysis indicated that the strength-maturity relationship does not reflect the strength result at a later age—this is related to one of the stated limitations of the existing ASTM C 1074 maturity method. Therefore, a modified equivalent age equation was developed, which takes into account the effect of the early-age concrete temperature on the long-term ultimate strength. The modified equation includes both the effect of the water diffusion through layers of hydrates and the effect of the chemical reaction (nucleation and growth) in forming new hydrates due to the combination of unhydrated cement with free water.
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Acknowledgments
The writers express appreciation for the support of the National Science Foundation under Contract No. NSFCMS 9988584. In addition, Nicholas Carino is acknowledged for occasional communication and advice. The many undergraduate and graduate students who have contributed to this project are also acknowledged.
References
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Published In
Journal of Materials in Civil Engineering
Volume 20 • Issue 12 • December 2008
Pages: 735 - 741
Copyright
© 2008 ASCE.
History
Received: Jun 27, 2005
Accepted: Jan 28, 2008
Published online: Dec 1, 2008
Published in print: Dec 2008
Notes
Note. Associate Editor: Zhishen Wu
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