00753882

Component

https://doi.org/10.3141/1609-05

http://scholar.google.com...osla&publication_year=1998

Three methods for classifying aggregate particle shape and texture - AASHTO TP33, ASTM D3398, and the flow rate method - were evaluated. These methods were used to rank four natural river sands and a crushed granite from good to poor performance based on the criteria established by each method. Test results indicate that all methods easily distinguished the crushed aggregate from the natural river sands. The AASHTO TP33 and the flow rate method were found to be somewhat less sensitive to slight differences in particle shape and texture than was ASTM D3398. All the test methods were found to be repeatable, each having low coefficients of variation for all the aggregates tested. To evaluate the effect of particle shape and texture and mineral filler content on mix performance in permanent deformation, one natural sand ranked as average performing was selected and blended with the crushed granite in the proportion of 20% natural sand and 80% crushed granite. Asphalt-aggregate mixtures containing 4, 6, 8, and 12% mineral filler were designed by using the Marshall procedure and were tested in repeated shear test at constant height. Within the range of mineral filler type and contents used, results indicate that mixtures containing 100% crushed granite show lower accumulation of permanent strain than does an 80/20 blend of crushed granite and natural sand, and an increase in the mineral filler content of a mixture was found to decrease its accumulated permanent strain while increasing the mixture shear resilient modulus.

This paper appears in Transportation Research Record No. 1609, Superpave: Binder Specifications, Mixture Design, and Construction.

English

p. 36-43

1998

Transportation Research Record

0309064546

Figures (3) ; References (5) ; Tables (4)

Aggregates by shape and surface texture; Asphalt concrete; Crushed rock; Granite; Mineral fillers; Mix design; Modulus of resilience; Performance; Sand; Shear tests; Strain measurement; Test procedures; Texture

Aggregate shape; Marshall mix design; Repeatability

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Sep 18 1998 12:00AM

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