Degradation of bituminous sealants due to extended heating before installation: a case study

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Proceedings titleCompendium of Papers CD-ROM, TRB 85th Annual Meeting : January 22-26, 2006, Washington, D.C.
Conference85th Annual Meeting of the Transportation Research Board, January 22-26, 2006, Washington, D.C., USA
Physical description14 p.
Subjectpavement, maintenance, crack sealing, sealants, installation, heating; Roads/Pavement; Pavements
AbstractBituminous sealants are applied to cracks and joints in pavements, bridges and other civil engineering structures. The sealants are generally applied at 180°C to 200°C, a temperature at which the sealant can degrade. In an effort to better understand the effect of installation on sealant properties, a sealant was collected at regular interval during its installation and analyzed by gel permeation chromatography (GPC), Fourier-transform infrared spectroscopy (FTIR), thermogravimetry (TG), and dynamic shear rheometry (DSR). The analysis of the aged sealants showed that the sealant was in its most degraded state early in the morning due to long pre-installation heating times around 150°C, which caused non-oxidative degradation. The degradation occurred at temperatures below the recommended installation temperatures. The degradation led to sealant stiffening, which was found to arise from a change in polymer structure, and from a loss in bitumen and polymer contents. This loss of organic material led to a relative increase in filler content. It is concluded that sealant preparation conditions, prior to installation, should be better controlled to optimize sealant performance.
Publication date
AffiliationNational Research Council Canada; NRC Institute for Research in Construction
Peer reviewedNo
NRC number47316
NPARC number20378096
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Record identifierc2e4ebf9-d052-40fe-9b73-3377a9315dd1
Record created2012-07-24
Record modified2016-05-09
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