Behavior of Thermoset Shape Memory Polymer-Based Syntactic Foam Sealant Trained by Hybrid Two-Stage Programming
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 3
Abstract
Recently, a shape memory polymer-based self-healing syntactic foam was proposed and tested as a sealant for expansion joints. The key for success is to train the foam by using a two-dimensional (2D) stress condition (compression in the horizontal or traffic direction and tension in the vertical direction) at a temperature above the glass transition temperature (). However, for practical applications, programming a full-size slab of sealant with a 2D stress condition and under temperature control is not a trivial task. This study demonstrated that the programming with a one-stage 2D stress condition can be replaced by a sequential two-stage one-dimensional (1D) stress condition. To further simplify the programming process, 1D tension programming was conducted at a temperature above the , followed by 1D compression programming at a temperature below the (cold compression). The test results show that the hybrid programming leads to similar shape memory behavior as long as the prestrain level in the two programing is similar or the prestrain absolutely predominates in one direction. Otherwise, the sealant exhibits a two-stage recovery: it recovers first in the direction with larger prestrain, followed by the direction with smaller presrtain, regardless of the programming sequence.
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Acknowledgments
The work is supported by Transportation Research Board (TRB) and Louisiana Transportation Research Center (LTRC) under grant number NCHRP/IDEA-142. Dr. Inam Jawed is the TRB program manager and Dr. Walid Alaywan is the LTRC project manager. The authors gratefully thank Dr. Manu John for the assistance in experiments.
The contents of this paper reflect the views of the authors who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the views or policies of the funding agencies.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 3 • March 2013
Pages: 393 - 402
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 9, 2012
Accepted: Apr 20, 2012
Published online: Apr 23, 2012
Published in print: Mar 1, 2013
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