Modification of bending beam rheometer specimen for low-temperature evaluation of bituminous crack sealants

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Proceedings titlePreservation of Roadway Structures and Pavements
Series titleJournal of the Transportation Research Board; no. 1933
ConferenceTransportation Research Board 84th Annual Meeting, January 9-13, 2005, Washington, D.C., USA
Pages97106; # of pages: 10
Subjectlow temperature, rheology, stiffness, creep, bending beam rheometer, sealants; Pavements; Roads/Pavement
AbstractIt is difficult to evaluate effectively the low-temperature stiffness of bituminous hot-poured crack sealants with existing test methods. The standard bending beam rheometer (BBR) was found to be inappropriate for testing soft bituminous-based hot-poured crack sealant, even at a temperature of -40°C. To address this issue, the moment of inertia of the tested beam was increased by doubling its thickness (from 6.35 mm to 12.7 mm). For the new beam dimensions, only 4% of the beam center deflection is due to shear, a value deemed acceptable for sealant evaluation and comparison. On this basis, the BBR stiffness of hot-poured sealants was obtained at several discrete temperatures between -10°C and -40°C to assess the repeatability of the method for the evaluation of the low-temperature stiffness of bituminous sealants. Ten different sealants were tested at -40°C; three of these 10 were further tested at -35°C, -30°C, -28°C, -25°C, and -20°C; and the three "hard" sealants were tested at -10°C. A minimum of three replicates were used. The coefficient of variation on the measured stiffness after 60 s of loading was always lower than 18%, with almost 75% of the measurements having a coefficient of variation less than 10%. A pairwise comparison showed that the modified BBR could be used to classify sealant products according to their measured stiffness. As to the effect of temperature, it was found that the stiffness varies exponentially with temperature in the range of -40°C to -20°C. A statistical analysis of the results indicated that the modified BBR method could be used to classify sealants based on low-temperature stiffness.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
NoteAlso published in "Transportation Research Board 84th Annual Meeting: Compendium of Papers CD-ROM.(2005)"
Peer reviewedYes
NRC number47628
NPARC number20377348
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Record identifierc84457ea-fce1-46e2-bab8-add6d1ca008c
Record created2012-07-24
Record modified2016-05-09
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