THE ROLE OF ROCK AND CLAST FABRIC IN THE PHYSICAL PERFORMANCE OF CRUSHED-ROCK AGGREGATE

Although crushed rock aggregate responds in a rational and predictable manner to the two tests designed by British standards for assessing aggregate strength, i.e., aggregate impact (IV) and crushing values (acv), the values obtained in both tests are influenced by intrinsic geological factors namely, petrology, petrography, rock and clast fabric. The impact value is affected further by procedural variables which have been identified and evaluated. When the effects of all these variables are known it is possible to understand the meaning of variation in test values within and between rock groups. Two new indices impact and aggregate crushing value residues were introduced to probe more deeply the effects of cataclasis during testing. These have proved to be sensitive indicators of the geological variables like petrology and clast shape. In view of the rational behaviour of aggregate in the predictive tests it is possible to erect a new and more utilitarian classification of roadstone materials based on mechanical factors rather than the mineralogical-chemical basis of existing classifications. An outline of such a classification is presented. /TRRL/

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  • Corporate Authors:

    Elsevier

    Radarweg 29
    Amsterdam,   Netherlands  1043 NX
  • Authors:
    • RAMSAY, D M
    • Dhir, R K
    • Spence, I M
  • Publication Date: 1974-10

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 267-285
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00099148
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM