This paper presents the results of some laboratory investigations, at the Central Road Research Institute (CRRI) of India, of the properties of coal ash and soil combinations that could be used to construct roads. Use of coal ashes for roads and buildings would solve the problem of ash disposal and pollution, and save reserves of hard stone. Burning of coal in power stations produces both fly ash and bottom ash. Suitable mixtures of fly ash and ground bottom ash and water are known as pond ash. Laboratory studies were conducted to find the suitability of these types of coal ashes, and especially of their strengths when mixed with different types of soil. The selected soils were in the CL, ML and CH groups of the IS Soil Classification System. Soils mixed with bottom ash were found to be stronger than those mixed with fly ash or pond ash. Thus bottom ash from power stations should be collected for their appropriate use in road works. Soils which are not strong enough for use in subgrade should be mixed with coarser coal ashes to improve their strength. Bottom ash could be used as a road sub-base. Mixtures of coal ash and black cotton soil could be used for embankment construction in clayey (BC) soil and for subgrade improvement.

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  • Corporate Authors:

    Indian Roads Congress

    Jamnagar House, Shahjahan Road
    New Delhi,   India  110 011
  • Authors:
    • DHAWAN, P K
    • Swami, R K
    • MEHTA, H S
  • Publication Date: 1994-11


  • English

Media Info

  • Features: References;
  • Pagination: p. 21-30
  • Serial:
    • Indian Highways
    • Volume: 22
    • Issue Number: 11
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 00713421
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, ATRI
  • Created Date: Nov 22 1995 12:00AM