Restrained Shrinkage Cracking and Dry Shrinkage of Rapid-Set Prepackaged Cementitious Materials
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 6
Abstract
The dry shrinkage characteristics of 23 rapid-set prepackaged cementitious materials collected from the current market have been investigated in this study. The materials showed various trends and rates of free dry shrinkage strain development. Overall, most materials had the free dry shrinkage of less than 0.05% at 28 days; however, only materials with the 28-day free dry shrinkage of less than 0.025% were observed to exhibit a low risk of restrained shrinkage cracking. The restrained shrinkage cracking typically occurred within a week after casting primarily because of the rapid growth of dry shrinkage during this period. A higher free dry shrinkage strain or a higher rate of free dry shrinkage strain development at the early age normally resulted in an earlier formation of cracking and a larger crack size during the restrained shrinkage test. Coarse aggregate extension reduced the free dry shrinkage and the risk or the size of restrained shrinkage cracking or delayed the time of restrained shrinkage cracking.
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Acknowledgments
The authors gratefully acknowledge the financial support received from the Tennessee Department of Transportation (TDOT) through the research project. The authors would also like to acknowledge the support received from Mr. Danny Lane and other technical personnel from TDOT for their collaboration and valuable inputs. Part of this work was performed through the Senior Concrete Laboratory class at the Middle Tennessee State University; as such the authors acknowledge the assistance from the students for the specimen preparation and testing.
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© 2016 American Society of Civil Engineers.
History
Received: Jun 22, 2015
Accepted: Oct 13, 2015
Published online: Jan 8, 2016
Published in print: Jun 1, 2016
Discussion open until: Jun 8, 2016
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