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Title: Effects of Type and Content of Mineral Filler on Viscosity of Asphalt Mastic and Mixing and Compaction Temperatures of Asphalt Mixture
Accession Number: 01111954
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: The mineral filler suspends in asphalt binder and forms asphalt mastic, which coats coarser aggregate particles in asphalt mixture. There are reasons to believe that the viscosity of the asphalt mastic, rather than that of the asphalt binder, should provide pertinent information on the mixing and compaction temperatures of asphalt mixture. Apparent viscosities were tested according to the procedure in ASTM D4402 on various types of asphalt mastics. Analyses of test results show that mastic viscosity is a well-defined linear function of temperature in the coordinates defined in ASTM D2493. The binder type, filler type, and dust-to-binder ratio have significant effects on the relationship between temperature and viscosity. A four-parameters model is appropriate to describe the variation of viscosity with temperature and mineral filler content. With the mastic equiviscous concept, the viscosity ranges are 0.576 ± 0.071 Pa-s and 0.968 ± 0.107 Pa-s for mixing and compaction, respectively, for asphalt mastic of unmodified binder, while for asphalt mastic of modified binder, the ranges are binder specific. The type and content of mineral filler have significant effects on the mixing and compaction temperatures. The dust-to-binder ratio of 0.9 for pulverized limestone is equivalent to 0.75 for portland cement and 0.4 for hydrated lime. For a change of 0.1 in dust-to-binder ratio, the mixing and compaction temperatures vary 3.5ºC for pulverized limestone mastics, 4.8ºC for portland cement mastic, and 9.3ºC for hydrated lime mastic. The modified binder does not exhibit any extraordinary behavior in determining the temperatures using mastic viscosity.
Monograph Title: Monograph Accession #: 01111956
Language: English
Authors: Zeng, MenglanWu, ChaofanPagination: pp 31-40
Publication Date: 2008
ISBN: 9780309113236
Media Type: Print
Features: Figures
(6)
; References
(18)
; Tables
(4)
TRT Terms: Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB, ATRI
Created Date: Oct 1 2008 10:37AM
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