MECHANICAL BEHAVIOR AND REINFORCEMENT OF MINERAL FILLER-ASPHALT MIXTURES

Research is reported on a method for characterizing the mechanical behavior (stress-strain response) of the mineral filler-asphalt composite and on the evaluation (based on the mechanical characterization) of the potential for interaction between mineral filler and asphalt. The literature on the subject was reviewed. Six different minerals were selected for use and prepared to give a well-defined size distribution; quartz and calcite were used in the bulk of the work. A special technique was developed for mixing the asphalt and mineral powder. In the mechanical behavior study, predetermined shear stresses (both quasi-static and sinusoidal) were applied to the specimen at three different temperatues and the resulting strain levels observed. It was found that the asphalt- mineral filler mixtures may be characterized as thermorheological, linear, viscoelastic materials, and such a characterization was used to evaluate the influence of mineral filler on the mechanical behavior of filler-asphalt mixtures. Using this representation as a means of comparison, it was shown that there is a potential for reinforcement in mineral filler-asphalt composites. The extent of the reinforcement is dependent on the time of test, nature of the asphalt and type and size of the mineral. The reinforcement disappears at short loading times; the reinforcement mechanism appears to be a flow dependent phenomena. Due to the potential for reinforcement, that is interaction beyond volume filling alone, it would appear that the consistency of stress-strain response of bulk asphalt it a poor of the asphalt-mineral filler matrix present in most asphaltic concrete.

• Supplemental Notes:
  • Proceedings of the meeting held in Houston, Texas, February 1973.
• Corporate Authors:

  University of Minnesota, Minneapolis

  155 Experimental Engineering Building
  Minneapolis, MN  United States  55455
• Authors:
  • Anderson, D A
  • Goetz, W H
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1973

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 37-66
• Serial:
  • Volume: 42

Subject/Index Terms

• TRT Terms: Asphalt concrete; Asphalt mixtures; Deformation curve; Evaluation; Material reinforcement; Mechanical properties; Mineral fillers; Shear stress; Temperature; Viscoelasticity
• Uncontrolled Terms: Interaction
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00127324
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 16 1975 12:00AM