ISSN: 1945-7553
CODEN: JTEVAB
Published Online: 1 March 2012
Page Count: 8

The Creep Testing Apparatus (CRETA): A New Testing Device for Measuring the Viscoelasticity of Joint Sealant

Li, Qiang
Graduate Research Assistant, Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL

Crowley, Raphael W.
Post Doctoral Associate, Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL

Bloomquist, David B.
Associate Professor, Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL

Roque, Reynaldo
Professor, Department of Civil and Coastal Engineering, University of Florida, Gainesville, FL

(Received 14 October 2011; accepted 20 January 2012)

Abstract

A new device, the Creep Testing Apparatus (CRETA), has been developed for use in determining the viscoelastic properties of joint sealant. Creep tests were conducted on two types of silicone sealant: self-leveling (SL) and non-self-leveling (NS). The results appear to indicate that the silicone sealant tested is a linear viscoelastic material and that its creep response does not appear to be sensitive to temperature variations from 0 °C to 60 °C. Further creep tests were conducted under artificial aging conditions. Hot water aging appears to cause both SL and NS sealant to become softer and more ductile. Freeze-thaw aging did not appear to have an effect on the viscoelastic properties. Oven aging did not appear to affect SL sealant, but it did cause NS sealant to become stiffer. These results might be useful in a long-term joint performance model.

Keywords:
creep, viscoelasticity, joint sealant, silicone, temperature sensitivity, liner viscoelasticity, aging, concrete pavement

Paper ID: JTE104431
DOI: 10.1520/JTE104431
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