Effects of Age and Deformation on Viscoelastic Behavior of Concrete Joint Sealant

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Title: Effects of Age and Deformation on Viscoelastic Behavior of Concrete Joint Sealant

Author(s): A. Gurjar and T. Tang

Publication: Special Publication

Volume: 181

Issue:

Appears on pages(s): 65-86

Keywords: Concrete pavements; deformation; finite element method; modulus; viscoelasticity

Date: 3/1/1999

Abstract:
This paper develops a finite-deformation viscoelastic material model to characterize the behavior of a silicone-based sealant material. A series of relaxation tests were performed on the test specimens for different levels of age and unit extension. Based on the experimental results, a master relaxation modulus curve is constructed. Unit extension and age effects are incorporated in the master relaxation curve by using the superposition principle. The shift factor equations developed were based on the relationship first suggested by William, Landel and Ferry (WLF Equation) and traditionally used for incorporating temperature effect. The unit extension and age dependence are accounted in the “reduced time”. The material model derived is of the generalized Maxwell (in parallel) type, which is simple and can be easily applied in finite element programs for stress analysis of joint sealants in concrete pavement.