Laboratory Investigation of Influencing Factors on Early-Age Delamination in CRC Pavements
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 8
Abstract
Studies since the early 1990s have been conducted in Texas to gain a better understanding of mechanisms, material properties, and construction practices related to early-age delamination in continuously reinforced concrete pavements made with gravel aggregates. However, information was still needed on: (1) the individual and overall effects of aggregate and nonaggregate factors on the early-age delamination; and (2) how the interfacial transition zone (ITZ) affects the early-age bond strength in terms of these factors. In this research, the effects of key material and construction factors including aggregate type, water-cementitious ratio, ultrafine fly ash content, and curing method were investigated through laboratory studies. A rating system based on utility theory was proposed to represent the overall aggregate effect through proper weighted contribution of its individual physical, geometric, and chemical characteristics. The investigation of possible corrective measures to minimize early-age delamination was conducted and results were presented. Petrographic analysis through selective ITZ investigation was undertaken to verify laboratory research findings.
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Acknowledgments
The research presented in this paper was part of a study on using gravel in concrete paving sponsored by the TxDOT. The writers gratefully acknowledge TxDOT for financial support.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 21 • Issue 8 • August 2009
Pages: 374 - 381
Copyright
© 2009 ASCE.
History
Received: Mar 21, 2007
Accepted: Dec 9, 2008
Published online: Jul 15, 2009
Published in print: Aug 2009
Notes
Note. Associate Editor: Eyad Masad
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