Effects of Moisture Conditioning on Chemical and Mechanical Properties of Asphalt Concrete

This study evaluates the effects of moisture conditioning on chemical composition and mechanical properties of asphalt concrete. In addition, how chemical changes affect the mechanical properties of asphalt is evaluated. Moisture conditioning is conducted using the AASHTO T 283 procedure and recently developed Moisture Induced Sensitivity Testing (MIST) device. Chemical analysis is performed using the Fourier Transform Infrared (FTIR) device and the mechanical testing is performed by beam fatigue testing, and a Dynamic Shear Rheometer (DSR). Results show that binder aging occurs while moisture conditioning. Moisture conditioning causes changes in six functional molecular groups of an asphalt binder. These changes are different for different conditioning procedures as well as degree of conditioning. It is observed that aging due to Sulfonate group (S=O) causes an increase in modulus and fatigue life. However, aging due to Carbonyl group (C=O) causes an increase in modulus but a decrease in fatigue life. It is also observed that Saturate (C-C) has the highest impacts on the asphalt binder properties.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFK40 Standing Committee on Characteristics of Asphalt-Aggregate Combinations to Meet Surface Requirements.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Ahmad, Mohiuddin
  • Mannan, Umme Amina
  • Islam, Md Rashadul
  • Tarefder, Rafiqul A
• Conference:
  • Transportation Research Board 95th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2016-1-10 to 2016-1-14
• Date: 2016

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 17p
• Monograph Title: TRB 95th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Asphalt concrete; Chemical properties; Fatigue (Mechanics); Mechanical properties; Moisture content
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01594619
• Record Type: Publication
• Report/Paper Numbers: 16-6677
• Files: TRIS, TRB, ATRI
• Created Date: Mar 29 2016 9:35AM