Details:

Alternative Title:
Project title: Develop test procedures to characterize material response behavior and transfer functions for TxDOT M-E design
Creators:
Zhou, Fujie ; Fernando, Emmanuel ; Scullion, Tom
Zhou, Fujie ; Fernando, Emmanuel ; Scullion, Tom Less -
Corporate Creators:
Texas Transportation Institute
Corporate Contributors:
Texas. Dept. of Transportation ; United States. Federal Highway Administration
Texas. Dept. of Transportation ; United States. Federal Highway Administration Less -
Subject/TRT Terms:
[+]
Evaluation Flexible Pavements Mathematical Models Pavements, Flexible--Texas--Evaluation Pavements, Flexible--Texas--Mathematical Models
Publication/ Report Number:
FHWA/TX-10/0-5798-2
Resource Type:
Tech Report
Geographical Coverage:
Texas
Edition:
Technical report; Sept. 2008-Aug. 2009.
Corporate Publisher:
Texas Transportation Institute
Abstract:
This study was intended to recommend future directions for the development of TxDOT’s Mechanistic-Empirical

(TexME) design system. For stress predictions, a multi-layer linear elastic system was evaluated and its validity was

verified by comparing the measured tensile strains under accelerated pavement (ALF) loading with the computed

values. After reviewing all existing pavement performance models, the VESYS model was recommended for predicting

flexible pavement layer rutting and an Overlay Tester-based fatigue cracking model was proposed, which includes both

crack initiation and propagation models.

For hot-mix asphalt (HMA) rutting predictions, the dynamic modulus test and repeated load test are proposed to

provide material properties. The proposed HMA rutting model was calibrated using the rutting data from the NCAT

test track and the Texas LTPP-SPS 5 test sections. The proposed fatigue cracking models were calibrated with

performance data from NCAT. Resilient modulus and permanent deformation testing is recommended for base and

subgrade materials and future research efforts are required to improve the repeatability of the permanent deformation

test. For stabilized bases the traditional fatigue models are recommended and calibration factors were proposed based

on existing accelerated pavement test data.

A field experiment was conducted to evaluate the adequacy of the LoadGage program to compute allowable axle

load limits for thin pavements. On sections trafficked to failure, very good results were obtained when moisture

correction factors were applied to the laboratory measured engineering properties. Implementation should proceed by

incorporating the proposed models and default material properties into a design software package, upgrading the

available repeated load equipment, performing additional calibration, and developing additional default values for a

w ider range of Texas materials.


Format:
PDF
Funding:
0-5798
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:a8f2a7a75adb758db53523a815d1c27bf99ff7959612abb2ea871400f5ca3706
Download URL:
https://rosap.ntl.bts.gov/view/dot/18313/dot_18313_DS1.pdf
File Type:

Supporting Files

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