Effects of Various Environmental Exposures and Sustained Load Levels on the Service Life of Postinstalled Adhesive Anchors
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 5
Abstract
This paper presents an experimental study on the long-term creep behaviour of adhesive anchors under sustained tensile loads in combination with different environmental exposures. A total of 72 pull-out test specimens with post-installed anchors were used. The test variables included the type of adhesive anchor, loading conditions (static, sustained), and the environmental exposures (room temperature, moisture, and freeze-thaw). Two sustained load levels of 32 kN and 48 kN (40% and 60% of the anchor’s yield strength) were considered. Sustained load tests lasted for a period of at least 90 days. The static pullout tests showed that specimens with epoxy adhesive exhibited stronger bond strength, forcing the anchor to fail by rupture prior to bond failure. Under sustained load tests, the total displacements over the service life were extrapolated and compared to displacement limits at 50 years (room temperature) and 10 years (moisture and freeze/thaw) in accordance with ICC-ES AC308. Specimens with standard set epoxy adhesive showed insignificant creep displacement under room conditions and satisfied the displacement limits; however, when exposed to moisture noticeable higher creep displacements were recorded and total displacement failed to meet the limit. Specimens with both fast setting epoxy and methyl methacrylate based adhesives showed higher creep displacements and failed to meet the displacement limits under environmental exposure (moisture and freeze/thaw) versus those kept at room temperature.
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Acknowledgments
This study was funded through a HIIFP contract by the Ministry of Transportation Ontario. Support by the technicians at the Structural Laboratory at University of Waterloo is greatly appreciated.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 5 • May 2014
Pages: 863 - 871
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 13, 2012
Accepted: Jun 17, 2013
Published online: Jun 19, 2013
Discussion open until: Nov 19, 2013
Published in print: May 1, 2014
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