A NEW METHOD OF PREDICTING THE STIFFNESS OF ASPHALT PAVING MIXTURES

This paper deals with the study of twelve bituminous mixes selected to cover the whole range of mixes for road, airfield and hydraulic work applications. The determination of their stiffness modulus and loss angle under dynamic load, with the aid of a two-point bending machine has led to the following conclusions: (1) the stiffness modulus of the mix (ratio of the stress amplitude to the strain amplitude), at relatively low temperatures and short times of loading, is essentially dependent on: (a) the stiffness modulus of the bitumen binder contained in the mix, under the service conditions, (b) the volume percentages of the different mix components (aggregates, bitumen binder, air). (2) the loss angle (phase lag between the stress and the strain) is mainly influenced by: (a) the bitumen binder consistency, (b) the volume percentage of this binder. From these findings, a method of predicting the stiffness modulus and loss angle has been developed. This method is applicable to all asphalt paving mixtures from filler-bitumen (mastic) mixes to very open (high void) mixes for roads. The stiffness modulus and the loss angle are determined with the aid of two nomographs or a computer programme. /Author/TRRL/

• Supplemental Notes:
  • This paper was presented at the Annual Meeting of the Association of Asphalt Paving Technologists (AAPT), San Antionio, Texas, USA, February 21-23, 1977.
• Corporate Authors:

  Shell, France

  Research Center
  Grande-Couronne,   France 
• Authors:
  • Bonnaure, F
  • Gest, G
  • Gravois, A
  • Uge, P
• Publication Date: 1977-2

Language

• English

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 19 p.

Subject/Index Terms

• TRT Terms: Angularity; Asphalt mixtures; Binders; Bituminous mixtures; Charts; Coefficients; Computer programs; Conferences; Dynamic loads; Equipment; Forecasting; Loads; Loss and damage; Methodology; Mix design; Stiffness; Strain (Mechanics); Stresses
• Uncontrolled Terms: Angles
• Old TRIS Terms: Strains
• ITRD Terms: 6427: Angle; 4967: Bituminous mixture; 6486: Chart; 6410: Coefficient; 8525: Conference; 132: Forecast; 5567: Load; 9040: Loss; 9102: Method; 8645: Software; 5931: Stiffness
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00165588
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: Monograph
• Files: ITRD, TRIS
• Created Date: Feb 16 1978 12:00AM