01155550

Component

https://doi.org/10.3141/2181-13

http://scholar.google.com...well&publication_year=2010

Mechanistic–empirical pavement design relies on empirical transfer functions to convert stresses and strains (from mechanistic analyses) to an allowable number of load repetitions until an acceptable limit of damage occurs. One method of determining transfer function for bottom-up fatigue cracking is to perform laboratory fatigue tests on the mixture or a range of potential mixtures intended for the pavement. Previous research estimated that shift factors on the order of 4 to 100 are needed to relate laboratory and field performance. There are a number of potential explanations for these shift factors, such as rest periods and healing. The structural test sections at the National Center for Asphalt Technology (NCAT) Test Track provided an opportunity to determine shift factors between transfer functions developed from laboratory beam fatigue tests and from the "Guide for Mechanistic–Empirical Design of New and Rehabilitated Pavement Structures" (MEPDG) and field performance. Strains input into the beam fatigue transfer function were measured using embedded pavement strain gauges and calculated using layered-elastic theory (PerRoad). The MEPDG was used to calculate strains for its transfer function. Fatigue shift factors were calculated for four of the structural sections from the 2003 NCAT Test Track. The fatigue shift factors determined using the measured strains ranged from 4.2 to 75.8. The fatigue shift factors determined with PerRoad ranged from 6.7 to 19.2. The fatigue equations developed from the laboratory testing were not used in the MEPDG; the NCHRP 1-37A-calibrated fatigue models were used. On the basis of these analyses, the MEPDG fatigue model reasonably predicts observed cracking.

01328240

10-4055

English

pp 117-124

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160551

Print

Figures (3) ; References (19) ; Tables (9)

Fatigue cracking; Laboratory tests; Mathematical prediction; Test sections; Test tracks; Transfer functions

Mechanistic-Empirical Pavement Design Guide

Fatigue life; Field performance

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

TRIS, TRB, ATRI

Jan 25 2010 12:05PM

• Characterization of Permanent Deformation of Asphalt Mixtures Based on Shear Properties
• Development of a Flow Number Predictive Model
• Development of Artificial Neural Network Predictive Models for Populating Dynamic Moduli of Long-Term Pavement Performance Sections
• Effect of Thermal Stresses on Pavement Performance Under Mild Climate Conditions
• Estimation of Stress Conditions for the Flow Number Simple Performance Test
• Fénix Test: Development of a New Test Procedure for Evaluating Cracking Resistance in Bituminous Mixtures
• Fatigue Crack Propagation Model of Asphalt Concrete Based on Viscoelastic Fracture Mechanics
• Multiscale Modeling to Predict Mechanical Behavior of Asphalt Mixtures
• Rutting Resistance of Laboratory-Prepared and Field-Compacted Asphalt Mixtures
• Semiempirical, Analytical, and Computational Predictions of Dynamic Modulus of Asphalt Concrete Mixtures
• Stiffening Mechanisms of Asphalt–Aggregate Mixtures: From Binder to Mixture
• Use of Nonuniform Stress-State Tests to Determine Fracture Energy of Asphalt Mixtures Accurately