USE OF FLY-ASH IN LEAN CONCRETE ROADBASES

In Great Britain lean concrete is extensively used for the construction of roadbases. However, it has some limitations because it cracks as a result of shrinkage and thermal stresses and it is often difficult to compact in layers more than about 200 mm in thickness. Trials by other workers, in the field of dam construction, have shown that the properties of lean concrete can be enhanced by the inclusion of fly-ash in the mix. The advantages claimed include low heat of hydration, ease of compaction, low permeability and good bonding between layers. This paper describes the results of investigations into the use of ash-modified lean concrete as a road making material. The first stage was a laboratory investigation to define its basic properties by studying the effect of varying cement, ash and water contents on the strength parameters of the material. The results of this work were then applied to pilot-scale trials where the compactability and structural behaviour of different mixes were studied. Finlly a full-scale field trial compared the development of thermal and traffic-induced cracking in ash-modified and conventional lean concrete. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00375225
• Corporate Authors:

  Silicates Industriels

  4 Avenue Gouverneur Cornez
  B-7000 Mons,   Belgium 
• Authors:
  • SHERWOOD, P T
  • POTTER, J F
• Publication Date: 1982

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 197-203
• Serial:
  • Silicate Industriels
  • Volume: 47
  • Issue Number: 9
  • Publisher: ASBL Silicates Industriels
  • ISSN: 0037-5225

Subject/Index Terms

• TRT Terms: Bonding; Compactibility; Compaction; Concrete; Cracking; Fly ash; Heat of hydration; Lean concrete; Pavement base course; Permeability; Properties of materials; Shrinkage; Strength of materials; Subgrade (Pavements); Temperature; Thermal stresses; Thickness; Waste products (Materials)
• Uncontrolled Terms: Concrete cracking
• Old TRIS Terms: Lean mix concrete
• ITRD Terms: 4563: By product; 3686: Compaction; 5211: Cracking; 4580: Fly ash; 4761: Lean concrete; 5921: Permeability; 5925: Properties; 2961: Roadbase; 4743: Shrinkage; 5544: Strength (mater); 6722: Temperature; 5933: Thickness
• Subject Areas: Geotechnology; Highways; Materials; Planning and Forecasting; I32: Concrete; I33: Other Materials used in Pavement Layers; I72: Traffic and Transport Planning;

Filing Info

• Accession Number: 00382665
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Apr 30 1984 12:00AM