A BITUMINOUS MIX OF IMPROVED RESISTANCE TO DEFORMATION

The article describes the development of grave-bitume (gravel-bitumen) which has high resistance to permanent deformation under heavy loading. The bituminous mix has a strong stone skeleton with a high filler content incorporating a harder than normal bitumen and a higher proportion of crushed aggregate than previously used in French roadbases. Aggregate gradings are similar to those used in the UK for dense bitumen macadam, but the harder binder used is likely to make gravel-bitumen twice as stiff and possess a better fatigue behaviour. It is suggested that the material could be used in thinner layers than other roadbase materials, providing comparable structural performance. Experience with gravel-bitumen as a roadbase has led to its application as an overlay both in conjunction with asphaltic concrete surfacings or with a surface dressing as a seal. Measurements have shown that the material has a higher stiffness and elastic modulus than asphaltic concrete. /TRRL/

• Corporate Authors:

  IPC Building and Contract Journals Limited

  32 Southwark Bridge Road
  London SE1 9EX,   England 
• Authors:
  • Peattie, K R
• Publication Date: 1976-4-23

Language

• English

Media Info

• Features: Photos; References; Tables;
• Pagination: p. 9-12
• Serial:
  • Surveyor - Public Authority Technology
  • Volume: 147
  • Issue Number: 4376
  • Publisher: IPC Building and Contract Journals Limited

Subject/Index Terms

• TRT Terms: Aggregate gradation; Asphalt concrete; Binders; Bitumen; Bituminous macadam; Bituminous mixtures; Crushed aggregates; Deformation; Fillers; Gravel; Hardness; Loads; Mechanical fatigue; Mix design; Modulus of elasticity; Pavement base course; Pavements; Sealing; Stiffness; Strength of materials; Structural strengthening; Thickness
• Uncontrolled Terms: Particle size distribution
• Geographic Terms: France
• Old TRIS Terms: Resistance; Sealing
• ITRD Terms: 4963: Bitumen; 4967: Bituminous mixture; 5595: Deformation; 5579: Fatigue (mater); 4599: Filler; 8036: France; 4575: Gravel; 5914: Hardness; 4714: Mix design; 5919: Modulus of elasticity; 6200: Particle size distribution; 2961: Roadbase; 5931: Stiffness; 5544: Strength (mater); 3096: Strengthening (pavement); 5933: Thickness
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00138894
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Oct 26 1976 12:00AM