01620235

Component

https://doi.org/10.3141/2640-04

The AASHTO Guide for Design of Pavement Structures 1993 (1993 Design Guide) remains the most widely used pavement design manual by highway agencies and design consultants around the world. As defined in the 1993 Design Guide, the structural coefficient of a pavement layer (ai) is an abstract measure of the relative ability of a unit thickness of a given material to function as a structural component of the pavement. Nevertheless, the assumed ai values of the asphalt layers and a proposed relationship between ai and the resilient modulus do not account for the mechanical and physical properties of asphalt materials, traffic volume and speed, layer thicknesses (thin versus thick pavements), climate, and unbound layer properties. The purpose of this research was to enhance the design methodology incorporated in the 1993 Design Guide by integrating asphalt mixture properties in the design process. The objective was to devise a relationship between the structural coefficient (aᵢ) of the asphalt layer and the effective dynamic modulus (|E*|eff.) of the corresponding asphalt mix to yield a more realistic estimate of the structural capacity of the asphalt layer. The paper illustrates the development of a multilinear relationship between aᵢ, (|E*|eff.), and the resilient modulus of the aggregate base layer. Pavement structural designs for various asphalt mixes and design inputs using the developed aᵢ–(|E*|eff.) relationship yielded asphalt layer thicknesses that were generally smaller than those obtained using the typical aᵢ value of 0.44 for the asphalt layer and closer to thicknesses obtained with the AASHTO mechanistic–empirical design method using the Pavement ME software.

01632437

17-04869

English

pp 29–40

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309441780

Digital/other

Figures (7) ; References (49) ; Tables (3)

Asphalt mixtures; Dynamic modulus of elasticity; Mechanistic-empirical pavement design; Mix design; Pavement design

American Association of State Highway and Transportation Officials

Highways; Maintenance and Preservation; Pavements

PRP, TRIS, TRB, ATRI

Dec 19 2016 1:11PM

• Accelerated Load Testing to Compare the Performance of Full-Depth Reclamation with Foamed Asphalt Under Three Environmental Conditions
• Autonomous Vehicles: Assessment of the Implications of Truck Positioning on Flexible Pavement Performance and Design
• Calibration of Asphalt Strain Transducers by Using Digital Image Correlation
• Deployment of the Next Generation Concrete Surface in Minnesota
• Ductile Concrete Material with Self-Healing Capacity for Jointless Concrete Pavement Use
• Further Evaluation of Limiting Strain Criteria for Perpetual Asphalt Pavement Design
• Impact of Concrete Pavement Structural Response on Rolling Resistance and Vehicle Fuel Economy
• Load Spectra–Incorporated Fatigue Cracking Model Implementation and Case Study
• Preparation of Joint Faulting Data for the Local Calibration of AASHTO Pavement Mechanistic–Empirical Design in Louisiana
• Thermal Stress Calculation Method for Concrete Pavement Based on Temperature Prediction and Finite Element Method Analysis
• Updates to Hourly Climate Data for Use in AASHTOWare Pavement Mechanistic–Empirical Design