EFFECTS OF SUPERPAVE RESTRICTED ZONE ON PERMANENT DEFORMATION

The purpose of this study is to evaluate the restricted zone effect using four different aggregates: crushed granite, crushed limestone, crushed river gravel, and a mixture of crushed river gravel as coarse aggregate with natural fines. As the restricted zone is a component of Superpave, the blends prepared met most of the Superpave criteria, except the restricted zone in selected mixtures and fine aggregate angularity in three mixtures. Each type of aggregate was used for mixture design of three gradations: above, through, and below the restricted zone. The twelve mixtures designed were tested in the laboratory to evaluate their relative resistance to permanent deformation. Four types of tests were performed using Superpave equipment: simple shear at constant height, frequency sweep at constant height, repeated shear at constant stress ratio, and repeated shear at constant height. Rutting resistance of the mixtures was measured using the Asphalt Pavement Analyzer. Researchers found that there is no relationship between the restricted zone and permanent deformation when crushed aggregates are used in the mixture design. Superpave mixtures with gradations below the restricted zone were generally most susceptible to permanent deformation while mixtures above the restricted zone were least susceptible to permanent deformation. Recommendations include elimination of the restricted zone from hot mix asphalt design specifications.

[1]  Robert P Elliott,et al.  EFFECT OF AGGREGATE GRADATION VARIATION ON ASPHALT CONCRETE MIX PROPERTIES , 1991 .

[2]  D. Anderson,et al.  EFFECT OF BAGHOUSE FINES ON MIXTURE DESIGN PROPERTIES , 1982 .

[3]  S B Seeds,et al.  EVALUATION OF INCREASED PAVEMENT LOADING AND TIRE PRESSURES , 1988 .

[4]  M van de Ven,et al.  VALIDATION OF SOME SUPERPAVE DESIGN PARAMETERS BY WHEEL TESTING WITH THE SCALE MODEL MOBILE LOAD SIMULATOR , 1997 .

[5]  William Goetz,et al.  Effect of Crushed-Gravel Fine Aggregate on the Strength of Asphaltic Surfacing Mixture , 1956 .

[6]  Xishun Zang,et al.  EVALUATING SUPERPAVE PERFORMANCE PREDICTION MODELS USING A CONTROLLED LABORATORY EXPERIMENT. , 1997 .

[7]  J W Button,et al.  Identifying and correcting rut-susceptible asphalt mixtures , 1991 .

[8]  D. Bloem,et al.  Soundness and Deleterious Substances , 1966 .

[9]  R J Cominsky,et al.  THE SUPERPAVE MIX DESIGN MANUAL FOR NEW CONSTRUCTION AND OVERLAYS , 1994 .

[10]  E R Brown,et al.  A NATIONAL STUDY OF RUTTING IN HOT MIX ASPHALT (HMA) PAVEMENTS , 1992 .

[11]  Yang H. Huang,et al.  Pavement Analysis and Design , 1997 .

[12]  R J Cominsky,et al.  SUPERIOR PERFORMING ASPHALT PAVEMENTS (SUPERPAVE): THE PRODUCT OF THE SHRP ASPHALT RESEARCH PROGRAM , 1994 .

[13]  Byron E Ruth,et al.  MAXIMIZING SHEAR RESISTANCE OF ASPHALT MIXTURES BY PROPER SELECTION OF AGGREGATE GRADATION , 1997 .

[14]  Guk-Rwang Won.  American Society for Testing and Materials , 1987 .

[15]  J W Button,et al.  Evaluation of the Superpave fine aggregate specification , 2000 .

[16]  C Crawford.  TENDER MIXES--PROBABLE CAUSES, POSSIBLE REMEDIES , 1986 .

[17]  P E Sebaaly,et al.  THE EFFECTS OF AGGREGATE GRADATION ON PERMANENT DEFORMATION OF ASPHALT CONCRETE , 1993 .

[18]  C E Bassett,et al.  EFFECTS OF MAXIMUM AGGREGATE SIZE ON RUTTING POTENTIAL AND OTHER PROPERTIES OF ASPHALT-AGGREGATE MIXTURES , 1990 .

[19]  Joe W Button,et al.  INFLUENCE OF COARSE AGGREGATE SHAPE AND SURFACE TEXTURE ON RUTTING OF HOT MIX ASPHALT CONCRETE. INTERIM REPORT , 1994 .

[20]  Serji N. Amirkhanian,et al.  EFFECTS OF LOS ANGELES ABRASION TEST VALUES ON THE STRENGTHS OF LABORATORY-PREPARED MARSHALL SPECIMENS , 1991 .

[21]  Rui Barros,et al.  Effect of Aggregate Gradation on Fatigue Life of Asphalt Concrete Mixes , 1998 .

[22]  R J Cominsky,et al.  LEVEL ONE MIX DESIGN: MATERIALS SELECTION, COMPACTION, AND CONDITIONING , 1994 .

[23]  N. Khosla,et al.  Effects of Aggregate Type and Gradation on Fatigue and Permanent Deformation of Asphalt Concrete , 1992 .