00741970

Component

https://doi.org/10.3141/1583-01

http://scholar.google.com...lson&publication_year=1997

The consensus aggregate properties recommended in SUPERPAVE and selected mixture properties were evaluated for a wide range of Minnesota aggregate sources obtained from 16 construction projects completed in 1993. Measured aggregate properties included the sand equivalent (SE) and fine aggregate angularity for the fine aggregate fractions, and percentage of fractured faces and flat and elongated particles in the coarse aggregate fractions. Laboratory-compacted samples were prepared and tested to determine air voids, voids in mineral aggregate (VMA), tensile strengths, and an assessment of the moisture sensitivity of the mixtures. Only 3 of 29 SE values for individual stockpiles were less than 40%. These values were not significantly affected by changes in either the general mineralogy (i.e., igneous, limestone, mixed) or the percentage passing the 0.075-mm (No. 200) sieve. Single regression analyses indicated no significant relationship between SE and either mixture moisture sensitivity or VMA. While all 25 stockpiles tested had fine aggregate angularity values greater than 40, 9 stockpiles had values below 45. It was suggested that since Minnesota aggregate gradations commonly pass through the SUPERPAVE restricted zone (one purpose of which is to limit the use of rounded natural sands), the minimum fine aggregate angularity value be set at 45 for all mixtures to preclude the use of 100% natural sands. A significant number of Minnesota coarse aggregate stockpiles have a moderate to high content of flat particles (20 to 50%).

This paper appears in Transportation Research Record No. 1583, Aggregate, Filler, and Reutilized Materials in Asphalt Mixtures.

English

p. 1-10

1997

Transportation Research Record

0309061644

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

Aggregate gradation; Aggregates; Air voids; Angularity; Coarse aggregates; Fine aggregates; Laboratory tests; Mineralogy; Moisture content; Particles; Sand equivalent test; Shape; Stockpiling; Superpave; Tensile strength

Moisture sensitivity; Voids in mineral aggregate

Minnesota

Minnesota

Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials; I36: Aggregates

TRIS, TRB

Oct 21 1997 12:00AM

• CHARACTERIZATION OF ASPHALT CEMENTS MODIFIED WITH CRUMB RUBBER FROM DISCARDED TIRES
• EFFECTS OF AGGREGATE DEGRADATION ON AIR VOIDS OF STRUCTURAL ASPHALT MIXTURE IN FLORIDA
• EVALUATION AND SELECTION OF AGGREGATE GRADATIONS FOR ASPHALT MIXTURES USING SUPERPAVE
• EVALUATION OF MATERIALS FROM NORTHEAST TEXAS USING SUPERPAVE MIX DESIGN TECHNOLOGY
• EVALUATION OF STEEL SLAG FINE AGGREGATE IN HOT-MIX ASPHALT MIXTURES
• EVALUATION OF TYPE C FLY ASH IN COLD IN-PLACE RECYCLING
• GEORGIA'S EXPERIENCE WITH CRUMB RUBBER IN HOT-MIX ASPHALT
• METHOD TO ENSURE STONE-ON-STONE CONTACT IN STONE MATRIX ASPHALT PAVING MIXTURES
• PERFORMANCE OF RUBBERIZED ASPHALT MIXES IN ALASKA
• STRUCTURAL LAYER COEFFICIENTS OF CRUMB RUBBER-MODIFIED ASPHALT CONCRETE MIXTURES
• THE SUPERPAVE GRADATION RESTRICTED ZONE AND PERFORMANCE TESTING WITH THE GEORGIA LOADED WHEEL TESTER
• USE OF SUPERPAVE TECHNOLOGY FOR DESIGN AND CONSTRUCTION OF RUBBERIZED ASPHALT MIXTURES