First steps for the perpetual pavement design

2012 ◽  
pp. 99-109 ◽  
Author(s):  
N Hernandez ◽  
J Hernandez ◽  
R Martinez
Keyword(s):  
Pavement Design ◽  
Perpetual Pavement

Incorporation of Endurance Limit in the Mechanistic-Empirical Flexible Perpetual Pavement Design

2018 ◽  
Vol 2672 (40) ◽  
pp. 108-121 ◽  
Author(s):  
Sheng Hu ◽  
Sang-Ick Lee ◽  
Lubinda F. Walubita ◽  
Fujie Zhou ◽  
Tom Scullion
Keyword(s):  
Endurance Limit ◽  
Design Method ◽  
Field Performance ◽  
Fatigue Cracking ◽  
Climatic Conditions ◽  
Influential Factors ◽  
Pavement Design ◽  
Design System ◽  
Viscoelastic Continuum Damage ◽  
Perpetual Pavement

In recent years, there has been a push toward designing long-lasting thick hot mix asphalt (HMA) pavements, commonly referred to as a perpetual pavements (PP). For these pavements, it is expected that bottom-up fatigue cracking does not occur if the strain level is below a certain limit that is called the HMA fatigue endurance limit (EL). This paper proposed a mechanistic-empirical PP design method based on this EL concept. The ELs of 12 HMA mixtures were determined using simplified viscoelastic continuum damage testing and the influential factors were comparatively investigated. It was found that HMA mixtures seem to have different EL values based on mix type and test temperatures. There is not just a single EL value that can be used for all mixtures. Thus, default EL criteria for different mixtures under different climatic conditions were developed and incorporated into the Texas Mechanistic-Empirical Flexible Pavement Design System (TxME). As a demonstration and case study, one Texas PP test section with weigh-in-motion traffic data was simulated by TxME. The corresponding TxME inputs/outputs in terms of the PP structure, material properties, traffic loading, environmental conditions, and ELs were demonstrated. The corresponding TxME modeling results were consistent with the actual observed field performance of the in-service PP section.

Further Evaluation of Limiting Strain Criteria for Perpetual Asphalt Pavement Design

2017 ◽  
Vol 2640 (1) ◽  
pp. 41-48 ◽  
Author(s):  
Alfredo J. Castro ◽  
Nam Tran ◽  
Mary Robbins ◽  
David H. Timm ◽  
Chris Wagner
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
Fatigue Cracking ◽  
Pavement Design ◽  
Threshold Values ◽  
Bottom Up ◽  
Test Track ◽  
Climatic Regions ◽  
Concrete Layer ◽  
Perpetual Pavement

Perpetual asphalt pavements have been designed with single threshold values for the horizontal strains at the bottom of the asphalt concrete layer and for vertical strains on top of the subgrade to prevent the occurrence of bottom-up fatigue cracking and subgrade rutting. Several thresholds have been utilized for design based on laboratory and field test results. Limiting strain distributions were recently proposed for perpetual pavement design instead of single threshold values for controlling the horizontal and vertical strains. These design criteria were developed with data collected from test sections at the National Center for Asphalt Technology pavement test track. The objective of this study was to conduct additional analyses of eight perpetual pavement sections located in different climatic regions, to support the proposed limiting strain criteria. These sections were simulated in the PerRoad perpetual pavement design software to determine the horizontal strains at the bottom of the asphalt concrete layer and the vertical strains on top of the subgrade. The strains were then analyzed to evaluate the proposed limiting strain criteria. Based on the simulations, the limiting horizontal strain distribution above the 60th percentile can effectively differentiate the calculated strain distributions of the eight perpetual pavement sections from those of the test sections that failed due to bottom-up fatigue cracking on the test track. In addition, the calculated vertical strains on top of the subgrade at the 50th percentile were lower than the proposed 200-microstrain limit. These results provide additional support for utilizing the proposed strain criteria in perpetual asphalt pavement design.

Economical Pavement Design by Stabilizing Effect of Fly Ash and Lime

2012 ◽  
Vol 2 (3) ◽  
pp. 121-124
Author(s):  
Prof. N. R. Patil Prof. N. R. Patil ◽  
◽  
Prof. D. R. Kulkarni Prof. D. R. Kulkarni ◽  
Prof. S. D. Talegaonkar Prof. S. D. Talegaonkar
Keyword(s):  
Fly Ash ◽  
Pavement Design ◽  
Stabilizing Effect
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