Analysis of bituminous crack sealants by physico-chemical methods and its relationship to field performance

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TypeArticle
Journal titleTransportation Research Record
Volume1795
Pages3339; # of pages: 7
Subjectcrack sealants, crack sealing, performance, analysis, spectroscopy, thermal analysis, viscometry, microscopy; Roads/Pavement; Pavements
AbstractBituminous crack sealants were analyzed by viscometry, fluorescence microscopy, infrared spectroscopy,thermogravimetry, modulated differential scanning calorimetry and low temperature tensile testing. The resultsindicate that sealants are blends of bitumen, oil, copolymer and filler. Upon blending, these components produce a three phase system that consists of a polymer-modified bitumen (PMB) matrix, a filler, and a filler-PMB interface. Spectroscopy and microscopy indicate that the PMB phase is rich in styrene-butadiene type copolymer, that the filler is recycled rubber, sometimes mixed with calcium carbonate, and that the interface depends on the filler and the oil content in the sealant. The physico-chemical methods were used to predict the short- and medium-term performance of sealant mixtures. The short-term performance predicted from viscometry and microscopy correlated well with the 1-year field performance of the sealants. Sealants showed two glass transition temperatures (Tg's), and a reasonable correlation was also found between the low temperature Tg and medium-term performance in a wet-freeze climate. However, because Tg measurements do not account for stress relaxation and aging effects, correlation was not perfect.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45015
14161
NPARC number20378770
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Record identifiercf2d86ae-320f-4093-a8bb-112811ef763f
Record created2012-07-24
Record modified2016-05-09
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