Selecting Concrete Pavement Joint Sealants. I: Proposed Test Protocol
Publication: Journal of Materials in Civil Engineering
Volume 11, Issue 4
Abstract
Sealants used to seal the transverse contraction joints used in joining concrete highway sections without dowels must be flexible enough to withstand excessive conditions such as large temperature fluctuations, severe pavement deflection due to heavy truck traffic, and prolonged moisture exposure. Choosing the most appropriate sealant for the expected service condition from the wide variety of sealants available on the market today can be a daunting task. In Part I of this paper, a comprehensive test protocol that correlates sealant viscoelastic properties with the sealant resistance to deflection is presented. It is proposed that the selection of a sealant should be based on a complete evaluation consisting of three test procedures: (1) the ASTM C794 adhesion-in-peel test to assess concrete/sealant adhesion; (2) dynamic mechanical analysis (DMA) to evaluate sealant flexibility by determining the glass transition temperature, Tg; and (3) the shear fatigue test developed by the writers to analyze sealant performance when subjected to severe pavement deflection in combination with various environmental conditions. Part II of this paper will present the results of testing and comparison of two polyurethane joint sealants using this proposed test protocol.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 11 • Issue 4 • November 1999
Pages: 302 - 308
History
Received: Jul 22, 1998
Published online: Nov 1, 1999
Published in print: Nov 1999
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