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Research Projects (2001-02)

Identifying Number


Project Title

Utilizing the GLWT in Evaluating Moisture Susceptibility of Asphalt Mixes


University of Wyoming

Project Investigator

Khaled Ksaibati
University of Wyoming

External Project Contact

Raymond Robertson
Program Manager WRI
9th and Lewis 317 A
Laramie, Wyoming 82072

Project Objective

The main objective of this study is to investigate the feasibility of utilizing the Georgia Loaded Wheel Tester (GLWT) in testing the moisture damage in asphalt mixtures.

Project Abstract

The main objective of this study is to obtain mixtures and mechanical properties for various asphalt mixes. These properties will be utilized in evaluating the effects of moisture on various types of asphalt mixes. The Georgia Loaded Wheel Tester (GLWT) will be utilized in predicting the moisture resistance of the asphalt mixes included in the study.

Task Descriptions

The following tasks will be performed in this project:

  • Task 1 – Obtaining asphalt and aggregate samples.
  • Task 2 – Preparing samples: Samples will be prepared in the Gyratory compactor. Some samples will not contain any anti-stripping agents while others will.
  • Task 3 – Establishing Testing Protocols: UW will examine various testing protocols in the GLWT. Efforts will be made to test asphalt mixes at various saturation levels.
  • Task 4 – Performing wet dry cycling: The samples will be subjected to various levels of wet dry cycles.
  • Task 5 – Performing GLWT testing on samples: The GLWT test will be performed on the samples.
  • Task 6 – Examining Samples: All samples tested in the GLWT will be examined to determine if moisture damage can be detected.
  • Task 7 – Summarizing Procedures: The most promising testing procedure for moisture damage will be identified. The testing steps will be documented and then verified.
  • Task 8 – Preparing a final report: UW will prepare a short and concise final report summarizing all the significant findings.

Milestones, Dates

  • Starting Date: July 1, 2001
  • Project Milestones:
    • Completing laboratory testing: March 31, 2002
    • Finishing the analysis: May 31, 2002
    • Deliver a Final MPC report: June 30, 2002
    • Submit a TRB paper: August 1, 2002
  • Ending Date: June 30, 2002

Yearly and Total Budget

Federal: $35,034
Matching: $41,454

Student Involvement

One graduate student; One undergraduate student

Relationship to Other Research Projects

The GLWT has been used historically to determine rut resistence. Minimal research has been done to use the GLWT in predicting moisture damage in asphalt mixes.

Technology Transfer Activities

Transportation Departments in region 8.

Potential Benefits of the Project

The results of this research will be helpful in identifying potential moisture problems with asphalt mixes.

TRB Keywords

Moisture resistance of asphalt mixes, Georgia Loaded Wheel Tester

NDSU Dept 2880P.O. Box 6050Fargo, ND 58108-6050