By Thomas D. White, Sam R. Johnson, John J. Tzenas, John J. Yzenas
STP 1412 specializes in the impact of combination homes on HMA functionality and covers a variety of mixture features. precious info is gifted on functionality of HMA designed with Superpave protocols and standards for either combos and aggregates.12 papers deal with: mixture sprucing as a security difficulty Contribution of the mineral combination elements to rutting resistance Superpave coarse and positive gradations Validity of the constrained region greatest mixture sizes volume of airborne dirt and dust, particle form, and coarse and fantastic mixture particle angularity. This booklet is a important source for everybody within the paving that produces, specifies, and makes use of aggregates.
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Extra resources for Aggregate Contribution to Hot Mix Asphalt (HMA) Performance (ASTM special technical publication, 1412)
Results of the mixture sensitivity analysis and the rutting performance modeling effort are described, and a summary and conclusions complete the paper. WesTrack The WesTrack project was sponsored by FHWA and NCHRP was a $15 million, 3 km full-scale test track near Reno, Nevada, that included 26 pavement test section locations [I]. Each section was 70 m in length with 25 m for transitioning between sections, 40 m for performance monitoring, and 5 m for destructive sampling. The facility was originally constructed between October 1994 and October 1995 and was subjected to traffic from March 1996 through March 1999.
The pavement was loaded using four driverless tractor/triple-trailer combinations. 48 ESALs, tire pressures were 700 kPa, and the speed of the vehicles was 64 km/hr . The objectives of the project were two-fold, but both focused on the 150 mm hot mix asphalt (HMA) surface layer of each pavement section that rested on 300 mm of densegraded crushed aggregate base course, 300 mm of engineered fill obtained from natural subgrade materials, and 150 mm of scarified and mixed subgrade soil. 075), and in-place air void (AV) content.
The effects of aggregate properties to rutting performance in APT were evaluated by comparing test results from the 10 mixtures. From the four mixtures constructed at high and low density level, test results from mixtures compacted to their optimum density were selected. And from the six mixtures constructed at high and low AC level, test results from mixtures constructed at their design AC were selected. The reason behind the selection procedure is to minimize the effects of over compaction and deviation from design AC in the evaluation of aggregate properties.