00741978

Component

https://doi.org/10.3141/1583-09

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

The effect of different mixing times and mixing temperatures on the performance of asphalt-rubber binder was evaluated. Four different types of asphalt-rubber binders and neat asphalt were characterized using the Strategic Highway Research Program (SHRP) binder method tests. Subsequently, mix designs were carried out using both the SHRP Levels I and II mix design procedures, as well as the traditional Marshall mix design scheme. Additionally, performance testing was carried out on the mixtures using the Superpave repetitive simple shear test at constant height (RSST-CH) to evaluate the resistance to permanent deformation (rutting) of the rubberized asphalt mixtures. Also, six rectangular beams were subjected to repeated bending in the fatigue tester at different microstrain levels to establish rubberized asphalt mixtures' resistance to fatigue cracking under repeated loadings. The results indicate that the Superpave mix design produced asphalt-rubber contents that are significantly higher than values used successfully in the field. Marshall-used gyratory compaction could not produce the same densification trends. Superpave mixture analysis testing (Level II) was used successfully for rubberized asphalt mixtures. Results clearly indicated that the mixture selected exhibited acceptable rutting and fatigue behavior for typical new construction and for overlay design. Few problems were encountered in running the Superpave models. The results of the RSST-CH indicate that rubber-modified asphalt concrete meets the criteria for a maximum rut depth of 0.5 in.; and more consistent results were measured for fatigue performance analysis using the repeated four-point bending beam testing (Superpave optional torture testing). The cycles to failure were approximately 26,000 at 600 microstrain.

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

English

p. 71-81

1997

Transportation Research Record

0309061644

Figures (9) ; References (5) ; Tables (6)

Accelerated tests; Asphalt rubber; Beams; Bending; Concrete tests; Cracking; Flexural strength; Mix design; Mixing; Performance evaluations; Performance tests; Repeated loads; Rutting; Shear tests; Structural tests; Superpave; Temperature; Test procedures; Time

Strategic Highway Research Program

Marshall mix design; Rut depth

Bridges and other structures; Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Oct 22 1997 12:00AM

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