THE USE OF PULVERISED FUEL ASH IN LEAN CONCRETE ROADBASES. PART 2: PILOT-SCALE TRIALS

Pilot-scale trials were laid to investigate the properties of roller-compacted lean concrete roadbases in which pulverised fuel ash was included as a partial replacement for some of the cement. A conventional lean concrete and a cement-rich concrete were included in the trials for comparison. Structural performance was assessed by measuring strain and deflection under a moving wheel and elastic modulus by surface wave propagation. Beam specimens cast in moulds and cut from the trial area were used to determine stress-strain relationships, flexural strength and elastic modulus. The measured transient deflections and strains in the ash-modified lean concrete pavements were similar to those in the conventional lean concrete; the values of elastic modulus were also similar. Results from the beams showed that in general the ash-modified mixes have a lower early life strength and a higher long term strength than conventional lean concrete. An analytical study suggested that both ash-modified lean concrete with a low early life strength and conventional lean concrete may suffer from microcracking when trafficked by construction vehicles at 7 days old but visible cracking should not occur. The overall structural behaviour of the pilot-scale trials was sufficiently encouraging to recommend a full-scale trial of ash-modified lean concrete. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03051315
• Corporate Authors:

  Transport and Road Research Laboratory (TRRL)

  Wokingham, Berkshire  United Kingdom 
• Authors:
  • HARDING, H M
  • POTTER, J F
• Publication Date: 1985

Media Info

• Features: Figures; References; Tables;
• Pagination: 15 p.
• Serial:
  • Supplementary Report
  • Publisher: Transport and Road Research Laboratory (TRRL)
  • ISSN: 0305-1315

Subject/Index Terms

• TRT Terms: Base course (Pavements); Deflection; Deformation curve; Flexure; Fly ash; General surface features of the earth; Geomorphology; Lean concrete; Microcracking; Modulus of elasticity; Pavements; Performance; Pilot studies; Pulverized fly ash; Structural analysis; Tests
• Old TRIS Terms: Lean mix concrete; Pavement deflection; Pilot study; Pulverized fuel ash; Trafficking
• ITRD Terms: 5586: Deflection; 4580: Fly ash; 4761: Lean concrete; 5919: Modulus of elasticity; 2961: Roadbase; 5573: Stress analysis; 4076: Structure (geomorphol); 6255: Test
• Subject Areas: Geotechnology; Highways; Materials; Pavements;

Filing Info

• Accession Number: 00451404
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Report/Paper Numbers: SR 838
• Files: ITRD, TRIS, ATRI
• Created Date: May 31 1986 12:00AM