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Title	Workability of hot mix asphalt
Record ID	24618
Personal Name Creator	Gudimettla, Jagan M.; Cooley, L. Allen; Brown, E. Ray
Source	NCAT Report No. 2003-03
Publisher	National Center for Asphalt Technology (Auburn University)
Publication Date	20030400
Abstract	Workability in the field can be defined as a property that describes the ease with which hot mix asphalt (HMA) can be placed, worked by hand and compacted. Use of polymer-modified binders has increase in the U.S. due to the resultant performance benefits. However, the workability of HMA incorporating these binders decreases significantly at given temperatures as the modifiers increase the viscosity of the binders. The primary objective of this study was to develop a laboratory device to measure the workability of HMA mixes that could identify the change in workability due to changes in mix characteristics. A device was successfully designed that uses a paddle in a sample of HMA. The torque required to keep the paddle rotating a constant speed is measured; workability is defined as the inverse of the torque required to rotate the paddle. There were numerous two- and three-way interactions that were significant, including the gradation shape, binder type, and nominal maximum aggregate size (NMAS). A preliminary attempt was made at utilizing workability data to determine optimum compaction temperature of HMA mixes; however, the results were inconclusive. References, appendix, 16 tables, 42 figures, 88 pages.
TRT Terms	Hot mix paving mixtures ; Binders ; Asphalt additives ; Asphalt mixtures ; Polymer asphalt ; Workability
General Subjects	Hot mix asphalt (HMA)
Classification	NTL - HIGHWAY/ROAD TRANSPORTATION - Construction and Maintenance; NTL - HIGHWAY/ROAD TRANSPORTATION - Materials; NTL - HIGHWAY/ROAD TRANSPORTATION - Pavement Management and Performance
Resource type	Research Paper
URL	http://ntl.bts.gov/lib/24000/24600/24618/rep03-03.pdf
Format	PDF
Language:	English
Database	NTL Digital Repository

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