There is a great need for the quarrying industry to be able to assess quickly and simply the quality of rock in a quarry. An x-ray method of doing this for basalt road aggregate has been developed. It is assumed that the type of secondary swelling clay mineral in a basalt flow and its distribution within the flow unit are relatively constant, and that the quality of the rock can be assessed from the amount of clay mineral present. Although this can be done by point counting of thin sections a more rapid and more elegant method is by x-ray diffraction. However, initially, the former is used to calibrate the latter. In the work described, the variation in the x-ray peak height of the swelling clay mineral with depth was examined for a diamond drill core that penetrated a series of basalt flows with different degrees of soundness. These results were then compared with those from a percussion drill hole located close to the diamond drill hole. The correlation between the two types of drilling was highly significant. Finally the x-ray peak heights were related to the various classes of rock specified by the Road Construction Authority of Victoria. The number of the covering abstract for the conference is TRIS No. 393385. (Author/TRRL)

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  • Supplemental Notes:
    • The Proceedings of the 12th Australian Road Research Board Conference, Hobart, Tasmania, 27-31 August 1984.
  • Corporate Authors:


    Melbourne, Victoria  Australia 
  • Authors:
    • Cole, W F
    • Lancucki, C J
    • Shayan, A
  • Publication Date: 1984

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 93-102
  • Serial:

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Filing Info

  • Accession Number: 00393420
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ITRD, TRIS, ATRI
  • Created Date: Jul 31 1985 12:00AM