Comparison Mechanical Properties Determined with Co-axial Shear Test and Four Point Bending Test

For the determination of the dynamic shear modulus of bituminous materials EMPA Switzerland developed the Co-axial Shear Tester (CAST). The CAST was designed to determine the complex shear modulus and phase angle of the mix, but can also be used to carry out fatigue shear tests. The advantage of the CAST compared to FPBT is that both laboratory prepared cylindrical samples and cores from the pavement can be used. For FPBT beams with larger dimension (50*50*450 mm) are used from slabs prepared in the lab or sawed from the pavement. Cores are more easily available and in general the cost of this operation is much lower. In the Netherlands the stiffness and fatigue behaviour is determined with the FPBT. In this paper the results are described of the comparison of complex modulus and fatigue properties for two asphalt mixes, measured in the CAST and FPBT. The complex modulus can be determined with good accuracy in a large temperature and frequency range with the CAST test. Still a correction is needed for the Poisson's ratio, specifically at low temperatures. The CAST test also looks very promising in fatigue. Further research into fatigue is needed to relate the shear test to the bending test.

• Corporate Authors:

  International Society for Asphalt Pavements

  4711 Clark Avenue, Suite G
  White Bear Lake, MN  United States  55110
• Authors:
  • van de Ven, MFC
  • VOSKUILEN, JLM
  • GUBLER, R
• Conference:
  • 10TH INTERNATIONAL CONFERENCE ON ASPHALT PAVEMENTS - AUGUST 12 TO 17, 2006, QUEBEC CITY, CANADA
• Publication Date: 2006

Language

• English

Media Info

• Media Type: Print
• Pagination: p. vol1,398-408
• Monograph Title: 10th International Conference on Asphalt Pavements - August 12 to 17, 2006, Quebec City, Canada

Subject/Index Terms

• TRT Terms: Base course (Pavements); Bituminous materials; Conferences; Deflection; Modulus of deformation; Shear strength; Test procedures; Viscoelasticity
• Geographic Terms: Canada
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01084431
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: TAC
• Created Date: Jan 16 2008 9:01AM