00803899

Component

https://doi.org/10.3141/1730-15

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

Although the trend for the next generation of pavement design methods is shifting to mechanistic design, the use of design methods based on the AASHO road rest results is still the current design practice in Texas and some other states. Critical to these design methods are the AASHTO load equivalency factors (LEFs), which are used to convert the mixed traffic axle loads into standard 18-kip (80.1-kN) equivalent single-axle loads. Several studies have been conducted on the subject of load equivalency for pavement design and analysis. However, there remain uncertainties related to various issues of load equivalency. Over the years, the composition and characteristics of traffic using Texas highways have been changing. The North American Free Trade Agreement has accelerated such changes in that more trucks, primarily moving among midwestern states, Texas, and Mexico, are traveling on Texas highways. In addition, the original AASHO road test was conducted at a site with environmental conditions significantly different from the environmental conditions in Texas. It is therefore critical to understand fully the impact of such changing traffic characteristics and environmental conditions on pavements in Texas. Presented is the methodology used to analyze the impact of these factors on the AASHTO LEFs.

This paper appears in Transportation Research Record No. 1730, Issues in Pavement Design and Rehabilitation.

English

p. 125-131

2000

Transportation Research Record

0309067324

Figures (4) ; References (31) ; Tables (5)

Design methods; Environment; Equivalent single axle loads; Flexible pavements; Impact studies; Traffic characteristics

AASHO Road Test; North American Free Trade Agreement

Load equivalency factors

Texas

Design; Highways; Operations and Traffic Management; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces

TRIS, TRB, ATRI

Dec 14 2001 12:00AM

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• CONSTRUCTION AND PERFORMANCE OF FLY ASH-STABILIZED COLD IN-PLACE RECYCLED ASPHALT PAVEMENT IN WISCONSIN
• COST-EFFECTIVENESS OF PAVING FABRICS USED TO CONTROL REFLECTIVE CRACKING
• EVALUATION OF CONCRETE PAVEMENT REHABILITATION TECHNIQUES ON I-65 IN INDIANA
• EVALUATION OF PROBABILITY DISTRIBUTION FUNCTION FOR THE LIFE OF PAVEMENT STRUCTURES
• FOUNDATION MODELING FOR JOINTED CONCRETE PAVEMENTS
• FRACTURE ENERGY TEST FOR HIGHWAY CONCRETE: DETERMINING THE EFFECT OF COARSE AGGREGATE ON CRACK PROPAGATION RESISTANCE
• INCORPORATION OF RELIABILITY INTO MECHANISTIC-EMPIRICAL PAVEMENT DESIGN
• LOAD AND DISPLACEMENT PREDICTION FOR SHAKEDOWN ANALYSIS OF LAYERED PAVEMENTS
• MECHANISTIC DESIGN FRAMEWORK FOR SPALLING DISTRESS
• MECHANISTIC DESIGN OF THIN WHITETOPPING PAVEMENTS IN COLORADO
• MECHANISTIC-EMPIRICAL APPROACH FOR MODELING REFLECTION CRACKING
• MECHANISTIC-EMPIRICAL RUT PREDICTION MODEL FOR IN-SERVICE PAVEMENTS
• PAVEMENT REHABILITATION SELECTION BASED ON MECHANISTIC ANALYSIS AND FIELD DIAGNOSIS OF FALLING WEIGHT DEFLECTOMETER DATA: VIRGINIA EXPERIENCE
• RUBBLIZATION OF CONCRETE PAVEMENTS: FIELD INVESTIGATION
• TEMPERATURE GRADIENT OF CONCRETE PAVEMENT SLAB OVERLAID WITH ASPHALT SURFACE COURSE
• THREE-DIMENSIONAL ANALYSIS OF CONTINUOUSLY REINFORCED CONCRETE PAVEMENTS
• TOP-DOWN CRACKING IN WASHINGTON STATE ASPHALT CONCRETE WEARING COURSES