00803834

Component

https://doi.org/10.3141/1728-11

http://scholar.google.com...Hesp&publication_year=2000

The effects of finely dispersed fillers on the fatigue performance of asphalt binders and asphalt concrete mixes at relatively low temperatures are examined. A series of model binder systems containing glass spheres with narrow particle size distributions were used to study the effect of filler particle size on the fatigue performance of the asphalt mastic. Two mastic systems containing ground limestone fillers, which possessed significantly different gradations, also were tested. Fatigue performance was evaluated by applying a constant torsional strain to each specimen in a dynamic rheometer at 10 deg C and 40 Hz. Testing at various strain levels allowed the relationship between fatigue life and strain to be determined for the different systems. The results indicate that as the particle size of the filler decreases, the fatigue life of the asphalt mastic increases. This observation is a direct result of the mode of fatigue failure in the asphalt mastics and is in agreement with Evans's theory on crack pinning for failure in filled brittle solids. Constant stress asphalt concrete fatigue tests on both dense- and gap-graded systems prepared with the two different ground limestone fillers show that the particle size does not significantly affect the fatigue life of the mixes. These results also confirm that crack pinning is the major mechanism responsible for improved fatigue performance.

This paper appears in Transportation Research Record No. 1728, Asphalt Binders 2000.

English

p. 75-81

2000

Transportation Research Record

0309067316

Figures (6) ; References (24) ; Tables (1)

Asphalt concrete; Bituminous binders; Fatigue (Mechanics); Fatigue tests; Fillers (Materials); Glass beads; Grain size (Geology); Limestone fillers; Low temperature; Mastic asphalt; Rheometers; Strain (Mechanics)

Crack pinning; Particle size distribution

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 7 2001 12:00AM

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• EFFECT OF FILM THICKNESS ON RHEOLOGICAL BEHAVIOR OF ASPHALT BINDERS
• ESTABLISHING LINEAR VISCOELASTIC CONDITIONS FOR ASPHALT BINDERS
• EVALUATION OF MOISTURE SUSCEPTIBILITY OF ASPHALT MIXTURES: CONVENTIONAL AND NEW METHODS
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• NEW CLASS OF REACTIVE POLYMER MODIFIERS FOR ASPHALT: MITIGATION OF LOW-TEMPERATURE DAMAGE
• NEW CLASS OF REACTIVE POLYMER MODIFIERS FOR ASPHALT: MITIGATION OF MOISTURE DAMAGE