Mechanistic Design Concepts for Full-Depth Asphalt Concrete Pavements
Gomez-Achecar, Manuel
This item is only available for download by members of the University of Illinois community. Students, faculty, and staff at the U of I may log in with your NetID and password to view the item. If you are trying to access an Illinois-restricted dissertation or thesis, you can request a copy through your library's Inter-Library Loan office or purchase a copy directly from ProQuest.
Permalink
https://hdl.handle.net/2142/69935
Description
Title
Mechanistic Design Concepts for Full-Depth Asphalt Concrete Pavements
Author(s)
Gomez-Achecar, Manuel
Issue Date
1984
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
A mechanistic design procedure for Full-Depth asphalt concrete AC pavements for highways is proposed and validated. The procedure is based on ILLI-PAVE, a stress dependent finite element computer program, coupled with appropriate transfer functions.
Two material design criteria are considered: AC flexural fatigue cracking and subgrade rutting. Fatigue cracking is controlled by limiting the tensile strain at the bottom of the AC layer. Subgrade rutting is controlled by limiting the stress-ratio at the AC-subgrade interface. Algorithms were developed relating pavement response parameters (stresses, strains, deflections) to AC thickness, AC moduli, and subgrade moduli. Two fatigue equations were calibrated with ILLI-PAVE algorithms and data from the AASHO Road Test bituminous wedge sections. Miner's hypothesis is used to develop a "closed form" solution for predicting pavement life. Weighting factors are developed and validated. Relationships between weighting factors and mean monthly air temperatures are established. From the WF-MMAT relationship a "design season condition" is determined. The design season condition is represented by the effective AC dynamic modulus and the subgrade resilient modulus corresponding to late spring or early summer.
The proposed mechanistic design procedure requires AC thicknesses less than those required by IDOT, the Asphalt Institute, and the Shell procedures. The thickness discrepancies vary depending on traffic and subgrade support.
Use this login method if you
don't
have an
@illinois.edu
email address.
(Oops, I do have one)
IDEALS migrated to a new platform on June 23, 2022. If you created
your account prior to this date, you will have to reset your password
using the forgot-password link below.
