00755034

Component

https://doi.org/10.3141/1630-14

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

The Superpave volumetric mix design is based on compaction of mixtures to Nmax revolutions, yielding approximately 2% air voids, and then backcalculating the properties of the mixture at Ndesign revolutions, which is the specified number of revolutions at which the sample should achieve 4% air voids. It has been shown, both in mixture design and in field quality control testing, that this backcalculation procedure is not always accurate for determining the number of gyrations that give 4% air voids in the compacted sample. The current backcalculation procedure is examined in this paper, and the observed inaccuracy in the current method is shown in both quality control/quality assurance (QC/QA) and the mixture design procedures. Also examined is an alternative method that has been shown to be more accurate in predicting the number of gyrations at which a mixture reaches a given air void level. This study recommends a method that gives higher accuracy in determining the number of gyrations at which a mixture reaches 4% air voids. A diverse group of mixtures, each having different properties, was examined, and an improved method for predicting the number of gyrations to accurately produce 4% air voids in the compacted mixture was determined.

This paper appears in Transportation Research Record No. 1630, Asphalt Mixtures: Stiffness Characterization, Variables, and Performance.

English

p. 117-125

1998

Transportation Research Record

0309065011

Figures (5) ; Tables (3)

Accuracy; Air voids; Alternatives analysis; Backcalculation; Compactors; Quality assurance; Quality control; Superpave

Gyratory compactors; Volumetric mix design

Data and Information Technology; Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Oct 12 1998 12:00AM

• APPLICABILITY OF SUPERPAVE TO MODIFIED ASPHALTS: A MIXTURE STUDY
• AUTOMATED PROCEDURE FOR GENERATION OF CREEP COMPLIANCE MASTER CURVE FOR ASPHALT MIXTURES
• CORRELATION OF SUPERPAVE G*/SIN DELTA WITH RUTTING TEST RESULTS FROM ACCELERATED LOADING FACILITY
• DETERMINING GYRATORY COMPACTION CHARACTERISTICS USING SERVOPAC GYRATORY COMPACTOR
• EFFECT OF AGGREGATE GRADATION ON FATIGUE LIFE OF ASPHALT CONCRETE MIXES
• EFFECTS OF AGING ON VISCOELASTIC PROPERTIES OF ASPHALT-AGGREGATE MIXTURES
• EVALUATION OF ABILITY OF SUPERPAVE SHEAR TESTER TO DIFFERENTIATE BETWEEN MIXTURES WITH DIFFERENT AGGREGATE SIZES
• EVALUATION OF STRIPPING FOR ASPHALT CONCRETE MIXTURES USING ACCELERATED TESTING METHODS
• IDENTIFICATION OF MOISTURE-SUSCEPTIBLE ASPHALT CONCRETE MIXES USING MODIFIED ENVIRONMENTAL CONDITIONING SYSTEM
• LOW-TEMPERATURE CRACKING AND AGING PERFORMANCE OF MODIFIED ASPHALT CONCRETE SPECIMENS
• REFERENCE STANDARDS FOR USE WITH INDIRECT TENSION TEST
• RELATIONSHIPS AMONG RATE-DEPENDENT STIFFNESSES OF ASPHALT CONCRETE USING LABORATORY AND FIELD TEST METHODS
• SHORT-LOADING-TIME STIFFNESS FROM CREEP, RESILIENT MODULUS, AND STRENGTH TESTS USING SUPERPAVE INDIRECT TENSION TEST