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

From National Research Council Canada

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Author	Search for: Masson, J-F.¹; Search for: Collins, P.¹; Search for: Woods, J. R.; Search for: Bundalo-Perc, S.¹; Search for: Al-Qadi, I. L.
Affiliation	National Research Council of Canada. NRC Institute for Research in Construction
Format	Text, Article
Conference	85th Annual Meeting of the Transportation Research Board, January 22-26, 2006, Washington, D.C., USA
Physical description	14 p.
Subject	pavement; maintenance; crack sealing; sealants; installation; heating; Roads/Pavement; Pavements
Abstract	Bituminous 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	2006-01-22
In	Compendium of Papers CD-ROM, TRB 85th Annual Meeting : January 22-26, 2006, Washington, D.C. (22 January 2006).
Language	English
Peer reviewed	No
NRC number	NRCC 47316 NRC-IRC-17889
NPARC number	20378096
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Record identifier	c2e4ebf9-d052-40fe-9b73-3377a9315dd1
Record created	2012-07-24
Record modified	2020-04-22

Date modified:: 2024-07-17