Laboratory evaluation for the use of moorum and Ganga sand in wet mix macadam unbound base course

Moorum is fragmented weathered rock naturally occurring with varying proportions of silt and clay. It is considered as a low grade marginal material for road construction by codes and has generally a low bearing capacity and high water absorption value in comparison to conventional aggregates. It finds application in the construction of water bound macadam as binders at such locations where it is abundantly available within short hauling distances. The quality of moorum varies significantly from one location to another in terms of its crushing and impact value, grain size, clay and deleterious content. Sukrat in Sonebhadra district of Uttar Pradesh has abundant good quality moorum. This gravelly material has been found to be well graded and has California bearing ratio (CBR) value of 40%, 10% fines value of 56 kN, and crushing and impact values were less than 30%. Ganga sand is a locally available fine sand at Varanasi. Therefore, the present work seeks to study the suitability of using moorum and local Ganga sand by partially replacing the stone dust proportion of conventional wet mix macadam (WMM). Secondly, ordinary Portland cement (OPC) was used as a stabilizer with moorum in proportions varying from 3% to 9% to study its suitability as WMM layer. A total of seven WMM mix proportions were considered, including the conventional mix. Results show that incorporation of Ganga sand to replace 20% proportion of stone dust of conventional WMM mix was found to improve the CBR value from 121% for conventional mix to 169%. This was while the same level of replacement with moorum had decreased the CBR value of WMM mix to a value of 94%. However, when moorum was used with OPC in an incremental rate of 3%, a significant increase was observed for dry density, CBR and unconfined compressive strength. This was achieved at the cost of loss of permeability of the mix. Moorum admixed with 3% OPC is preferable on account of being comparable to the conventional WMM mis in terms of CBR value, retaining its permeability and affording maximum cost savings. Cost comparisons show significant savings on admixing, as compared to the conventional WMM mix.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Ranshinchung, G D
    • Kumar, Praveen
    • Kumar, Brind
    • Anupam, Aditya Kumar
    • Chauhan, Arun Prakash
  • Publication Date: 2014-4

Language

  • English

Media Info

  • Media Type: Print
  • Features: References; Tables;
  • Pagination: pp 39-45
  • Serial:
    • Indian Highways
    • Volume: 42
    • Issue Number: 4
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 01523959
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 30 2014 1:13PM