00780180

Component

https://doi.org/10.3141/1681-09

http://scholar.google.com...wers&publication_year=1999

It has long been known that the use of carefully designed asphalt concrete mixes can increase the rutting resistance and structural capacity of flexible pavements. Unfortunately, optimization of asphalt mixes for intermediate pavement courses has been inhibited in the past by the use of wide limits in the aggregate gradation. This has sometimes led to insufficient amounts of top-size and fine aggregate, suboptimal packing density, unnecessarily high asphalt cement contents, and a resultant lack of stone-on-stone contact and mix stability. In addition, accurate laboratory evaluation of intermediate course mixes has been hampered by the use of traditional 10-cm (4-in.) specimen molds, which are too small to yield representative test results for some mixes with 2.5-cm (1-in.) aggregate. This study consisted of laboratory evaluation of 10 asphalt concrete intermediate course trial mixes, with five different dense gradations for two aggregate types: natural gravel (rounded) and crushed limestone (angular). The five gradations (nominal maximum aggregate size, 2.5 cm) were developed following an overall volumetric concept as used in the design of portland cement concretes. Test specimens were prepared with 15-cm (6-in.) molds. Specimens prepared at the determined optimum asphalt cement contents were tested for modulus of resilience, indirect tensile strength, indirect tensile creep, unconfined compressive strength, and resistance to moisture-induced damage. Mixes based on three of the evaluated gradations consistently showed superior performance to traditional mixes. Recommended mix design criteria are provided to assist in optimization of intermediate course mixes.

This paper appears in Transportation Research Record No. 1681, Hot-Mix Asphalt Mixtures.

English

p. 69-75

1999

Transportation Research Record

0309071070

Figures (8) ; References (14) ; Tables (6)

Aggregate gradation; Asphalt concrete; Asphalt content; Compressive strength; Creep; Crushed limestone; Flexible pavements; Gravel; Laboratory tests; Mix design; Modulus of resilience; Optimization; Pavement performance; Rutting; Specimens; Tensile strength

Moisture susceptibility; Molds

Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 3 1999 12:00AM

• COMPARISON OF LABORATORY WHEEL-TRACKING TEST RESULTS WITH WESTRACK PERFORMANCE
• DIFFICULT NATURE OF MINIMUM VOIDS IN THE MINERAL AGGREGATE: HISTORICAL PERSPECTIVE
• EFFECT OF FLAT AND ELONGATED COARSE AGGREGATE ON CHARACTERISTICS OF GYRATORY COMPACTED SAMPLES
• EFFECT OF GRADATION ON ASPHALT MIXTURE PERFORMANCE
• EVALUATION OF AGGREGATE SIZE CHARACTERISTICS IN STONE MATRIX ASPHALT AND SUPERPAVE MIXTURES
• EVALUATION OF STRIPPING IN VIRGINIA'S PAVEMENTS
• EVALUATION OF SUPERPAVE REPEATED SHEAR AT CONSTANT HEIGHT TEST TO PREDICT RUTTING POTENTIAL OF MIXES: PERFORMANCE OF THREE PAVEMENT SECTIONS IN NORTH CAROLINA
• HOT-MIX ASPHALT VOLUMETRICS REVISITED: A NEW PARADIGM
• KENYA BITUMINOUS MATERIALS STUDY
• LABORATORY EVALUATION OF CLOGGING POTENTIAL OF POROUS ASPHALT MIXTURES
• MUNICIPAL IMPLEMENTATION OF SUPERPAVE TECHNOLOGY
• NONDESTRUCTIVE EVALUATION OF COMPLEX MODULI IN ASPHALT CONCRETE WITH AN ENERGY APPROACH
• QUANTIFYING LABORATORY COMPACTION EFFECTS ON THE INTERNAL STRUCTURE OF ASPHALT CONCRETE
• SELECTION OF LABORATORY TEST SPECIMEN DIMENSION FOR PERMANENT DEFORMATION OF ASPHALT CONCRETE PAVEMENTS
• TEN-YEAR PERFORMANCE EVALUATION OF ASPHALT-RUBBER SURFACE MIXES
• UNDERSTANDING ASPHALT MASTIC BEHAVIOR THROUGH MICROMECHANICS (WITH DISCUSSION AND CLOSURE)
• USE OF RECLAIMED ASPHALT PAVEMENT IN SUPERPAVE HOT-MIX ASPHALT APPLICATIONS
• USE OF SUPERPAVE GYRATORY COMPACTOR TO CHARACTERIZE HOT-MIX ASPHALT
• USE OF THE HAMBURG WHEEL TRACKING DEVICE FOR EVALUATING MOISTURE SUSCEPTIBILITY OF HOT-MIX ASPHALT
• USING SUPERPAVE PERFORMANCE TESTS TO EVALUATE ASPHALT MIXTURES
• X-RAY TOMOGRAPHY OF ASPHALT CONCRETE