01155697

Component

A study to evaluate a stone matrix asphalt (SMA)-like asphalt mixture termed “stone skeleton asphalt” was conducted. The concept of stone skeleton asphalt was a mixture that would have similar performance characteristics to typical SMA mixtures, but without the elements contained in SMA mixtures that increase its cost. A 19.0 mm nominal maximum aggregate size (NMAS) limestone/granite blend SMA was used as a control mixture, from which cost increasing elements were systemically removed to assess their influence on volumetrics, draindown, and performance. Performance tests included resistance to rutting and falling-head permeability testing. The inclusion of fibers increased the mixture’s voids in mineral aggregate (VMA) and optimum asphalt content. The absence of fibers did increase the amount of draindown compared to the mixtures with fibers included, but did not exceed the maximum specified limit. The rutting results from the mixtures containing PG 67-22 and fibers, and particularly the additional percentage of fly ash, indicated similar results to those of the mixtures with a modified PG 76-22 asphalt binder. At typical in-place densities, stone skeleton mixtures appear to be permeable. The potential impacts on the mixtures durability were not evaluated in this study.

01147878

10-3548

English

16p

2010

Transportation Research Board 89th Annual Meeting

DVD

Figures (5) ; References (8) ; Tables (6)

Aggregate gradation; Aggregates; Asphalt mixtures; Bituminous binders; Bituminous materials; Costs; Density; Fiber reinforced materials; Fly ash; Permeability; Rutting; Stone matrix asphalt

Highways; Materials; Pavements; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings

Transportation Research Board Annual Meeting 2010 Paper #10-3548

TRIS, TRB

Jan 25 2010 11:48AM