01046320

Component

https://doi.org/10.3141/2016-05

http://scholar.google.com...amed&publication_year=2007

The effectiveness of an approach, based on the use of default resilient modulus (M sub r) values in providing input to the Mechanistic–Empirical Pavement Design Guide (MEPDG) developed under the NCHRP 1-37A project, was evaluated. The process is intended to assist users of the guide in estimating the M sub r of an unbound material based on its AASHTO soil class. Assessment conducted at the National Research Council Canada (NRC) involved comparing values of the parameter determined in the laboratory using the AASHTO protocol with default values included in the MEPDG. Comparison revealed that the proposed default values frequently overestimate the value of the Mr parameter, hence yielding inadequate layer design. Examination of the AASHTO M sub r test revealed that the procedure does not account for permanent deformations that accumulate during the laboratory test. These findings prompted the NRC team to develop a different approach for estimating the M sub r parameter. The new approach yielded a mechanistic soil classification system based on the material response captured in the laboratory. A practical procedure for implementing the new mechanistic classification system was facilitated by establishing correlations between physical and mechanical properties of the materials. These correlations were found to be more accurate in estimating the M sub r parameter and were expected to produce better design when used as input for running the MEPDG model.

01084477

English

pp 39-48

2007

Transportation Research Record: Journal of the Transportation Research Board

9780309104432

Print

Figures (6) ; References (7) ; Tables (4)

Base course (Pavements); Correlation analysis; Mechanical properties; Modulus of resilience; Pavement design; Physical properties

Mechanistic-Empirical Pavement Design Guide

Soil classification; Unbound materials

Data and Information Technology; Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I41: General Soil Surveys; I42: Soil Mechanics

TRIS, TRB, ATRI

Feb 8 2007 5:16PM

• Assessment of Debonding in Concrete Slabs Using Seismic Methods
• Elastic Nonlinear Finite Element Analysis of a Flexible Pavement Subjected to Varying Falling Weight Deflectometer Loads
• Evaluating the Light Falling Weight Deflectometer Device for In Situ Measurement of Elastic Modulus of Pavement Layers
• Genetic Algorithms–Based Network Optimization System with Multiple Objectives
• Gravel Roads Surface Performance Modeling
• Ground Proving Three Seismic Refraction Tomography Programs
• Initial Findings on Skid Resistance of Unpaved Roads
• Monod Kinetics for Aerobic Biodegradation of Calcium Magnesium Acetate: Soil Microcosms from a Highway Shoulder
• New Approach for Estimating Rock Slope Stability Using Logistic Regression Analysis
• Permanent Deformation and Critical Stress of Cohesive Soil Under Repeated Loading
• Rockfill Embankment Settlement: Sugarloaf Mountain Bridge Abutment and Hoover Dam Bypass (US-93)
• Two-Step Fracture Mechanics–Based Approach to Assess Early-Age Delamination Distress