USING DYNAMIC MECHANICAL ANALYSIS AS A TOOL TO ACCESS THE SUITABILITY OF FILLERS IN ASPHALT MIXTURES BASED ON THE MASTIC PROPERTIES

Dynamic mechanical analysis (DMA) is used to evaluate the microcracking damage potential in sand asphalt mixtures. Microcracking has been shown to be associated with both fatigue cracking damage and the accumulation of permanent damage (rutting) under repeated compressive loading. Testing is performed at 250C in controlled-strain, torsional loading. Failure is defined as the transition point in the plot of normalized dynamic modulus (ratio of dynamic modulus at any time to the initial value of dynamic modulus at the first loading cycle) versus number of loading cycles. The transition point was judged to be the best general indicator of fatigue failure. DMA testing is able to clearly differentiate among the effects of various mineral fillers. It can be used as a screening tool to assess the cohesive strength properties and damage sensitivity of various mastics and to select asphalt filler combinations that optimize mastic properties and hence mixture properties.

• Supplemental Notes:
  • Full conference proceedings available on CD-ROM.
• Corporate Authors:

  University of Texas, Austin

  International Center for Aggregates Research, 3208 Red River
  Austin, TX  United States  78705-2650

  Texas A&M University, College Station

  Faculty Exchange Box H
  College Station, TX  United States  77843
• Authors:
  • Little, D N
  • Kim, Y R
• Conference:
  • International Center for Aggregates Research 10th Annual Symposium: Aggregates - Asphalt Concrete, Portland Cement Concrete, Bases and Fines
  • Location: Baltimore, Maryland
  • Date: 2002-4-14 to 2002-4-17
• Publication Date: 2002

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 17p

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Compressive strength; Dynamic tests; Fatigue (Mechanics); Mastic asphalt; Mechanical analysis; Microcracking; Mineral fillers; Rutting; Sand; Torsional strength
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00983546
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 22 2004 12:00AM