00621478

Component

http://onlinepubs.trb.org...trr/1991/1317/1317-011.pdf

https://scholar.google.co...iner&publication_year=1991

In recent years, polymer-modified asphalt mixtures have been increasingly used in the construction of flexible pavements. These products have gained popularity because of their ability to increase pavement performance in both cold and hot environments. The increased elasticity from the polymer imparted to the mixtures at cold temperature increases the pavement's ability to resist thermal cracking. The increased stiffness, as well as the increased elasticity, of these mixtures at warm temperatures has shown an improved resistance to rutting. The increased resistance to rutting in warm climates was of particular interest for construction projects in the hot desert climate of southern Nevada. To investigate the potential benefits of these polymer-modified materials, the Nevada Department of Transportation (NDOT) placed six polymer-modified experimental test sections between Los Vegas, Nevada, and the Arizona border in December 1989. The University of Nevada, Reno, in conjunction with NDOT, developed a research program to rank the rutting potential of the various mixtures and the increased rutting potential in the presence of moisture. Conclusions from this research were that strains observed in creep testing depend on the location of instrumentation and boundary conditions imposed on the sample. Results showed that a ranking of the materials (lowest to highest strain) was the same for 8-in.-high samples instrumented over the center third or over full depth. A finite element analysis showed that the magnitude of strains observed depends on the area of instrumentation. End friction in the sample can give rise to substantial difference in the creep strain measurements made. Conclusions also indicate that the permanent strains after moisture conditioning appear to be a good indicator of possible moisture damage.

This paper appears in Transportation Research Record No. 1317, Asphalt Mixtures: Design, Testing, and Evaluation 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407169

p. 100-108

1991

Transportation Research Record

030905155X

Figures (8) ; References (4) ; Tables (7)

Creep tests; Deserts; Finite element method; Instrumentation; Location; Loss and damage; Moisture damage; Polymer asphalt; Ruts (Pavements); Strain (Mechanics); Test sections; Water

Rut

Nevada

Nevada

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

TRIS, TRB, ATRI

Apr 30 1992 12:00AM

• ANALYSIS OF CRACK PROPAGATION IN ASPHALT CONCRETE USING COHESIVE CRACK MODEL
• DEVELOPMENT OF A PRACTICAL METHOD FOR DESIGN OF HOT-MIX ASPHALT
• EFFECT OF AGGREGATE GRADATION VARIATION ON ASPHALT CONCRETE MIX PROPERTIES
• EFFECT OF LOADING MAGNITUDE ON MEASURED RESILIENT MODULUS OF ASPHALTIC CONCRETE MIXES
• EFFECT OF TEMPERATURE AND MIXTURE VARIABLES ON FATIGUE LIFE PREDICTED BY DIAMETRAL FATIGUE TESTING
• EFFECT OF THE USE OF MODIFIERS ON PERFORMANCE OF ASPHALTIC PAVEMENTS
• EFFECTS OF SAMPLE PREPARATION AND AIR-VOID MEASUREMENT ON ASPHALT CONCRETE PROPERTIES
• EVALUATION OF MARSHALL AND HVEEM MIX DESIGN PROCEDURES FOR LOCAL USE
• EVALUATION OF MIX PROPERTIES OF COLD IN-PLACE RECYCLED MIXES
• EVALUATION OF RESIN-MODIFIED PAVING PROCESS
• MATERIAL CHARACTERIZATION AND INHERENT VARIATION ANALYSIS OF ASPHALTIC FIELD CORES
• METHODS TO DETERMINE POLYMER CONTENT OF MODIFIED ASPHALT
• NEW TECHNIQUE TO MEASURE MOISTURE IN HOT-MIX ASPHALT CONCRETE NONDESTRUCTIVELY
• PERFORMANCE ASSESSMENT OF BINDER-RICH POLYETHYLENE-MODIFIED ASPHALT CONCRETE MIXTURES (NOVOPHALT)