Performance of a Stabilized Aggregate Base Subject to Different Durability Procedures
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 5
Abstract
This study examined the effects of two freeze-thaw (FT) laboratory procedures, FT-1 and FT-2, on stabilized aggregate specimens. Cylindrical specimens were stabilized with 10% Class C fly ash (CFA) cured for selected periods and then subjected to either FT-1 or FT-2 cycles. FT-1 and FT-2 procedures consisted of freezing specimens at for 24 h and thawing them at for another 24 h with a high relative humidity; the only difference was that FT-1 required a membrane around each specimen, while FT-2 required no membranes during freezing and thawing. After being subject to freezing and thawing actions, specimens were then tested for resilient modulus and unconfined compressive strength (UCS) values. Results showed that the values of 28-day cured specimens increased as FT-1 cycles increased up to 12, beyond which a reduction in values was observed. For 3-day cured specimens the increased with FT-1 cycles up to 30. The UCS values of 28- and 3-day stabilized specimens also exhibited the same trend as the with FT-1 cycles. In addition, the specimens subject to 30 FT-2 cycles exhibited a higher reduction in values than the specimens subject to FT-1. This behavior is explained by the moisture increase in the specimens subject to FT-2 cycles which caused an ice lens formation in the fine matrix and destruction in the particle matrix. The study also showed that the -stress model recommended by the new mechanistic-empirical pavement design guide for unbound pavement materials could be a statistically good and a reliable predictor of the values of stabilized aggregate bases.
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Acknowledgments
The writers are thankful to Mr. Charbel Khoury, Dr. Joakim Laguros, and Dr. Musharraf Zaman for their help.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 5 • May 2010
Pages: 506 - 514
Copyright
© 2010 ASCE.
History
Received: Sep 4, 2008
Accepted: Oct 22, 2009
Published online: Oct 24, 2009
Published in print: May 2010
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