United States Department of Transportation
i
Characterization of low temperature mechanical properties of crack sealants utilizing direct tension test.
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2008-11-01
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[PDF-4.36 MB]
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Abstract:Crack sealing has been widely used as a routine preventative maintenance practice. Given its proper
installation, crack sealants can extend pavement service life by three to five years. However, current
specifications for the selection of crack sealants correlate poorly with field performance. The purpose of this
research was to develop performance guidelines for the selection of hot-poured bituminous crack sealants at
low temperature. This was accomplished by measuring the mechanical properties of crack sealant at low
temperature and then developing performance criteria for material selection. The modified direct tension test
(DTT), crack sealant direct tension test (CSDTT), simulates the in-situ loading behavior of crack sealants in the
laboratory. A modified dog-bone specimen geometry, which allows specimens to be stretched up to 95%, is
recommended. This new specimen geometry also facilitates sample preparation. Tensile force is applied to the
dog-bone specimen, with its effective gauge length of 20.3mm, and is pulled at a deformation rate of
1.2mm/min. Fifteen sealants were tested at various temperatures, and three performance parameters are
suggested as indicators of sealant performance: extendibility, percent modulus reduction, and strain energy
density. Extendibility, which is used to assess the degree of deformation undergone by a sealant at low
temperature before it ruptures or internal damage is observed, is recommended as a measured parameter to be
included in the performance-based guidelines for the selection of hot-poured crack sealants. Extendibility
thresholds were defined as function of low service temperatures. The CSDT is conducted at +6oC above the
lowest in service temperature because of the relatively high test loading rate compared to in-situ crack sealant
movement rate.
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