This paper examines the integrity of standard tests used in Ireland and investigates the significance of substitute tests. Recommendations are made for the inclusion of new procedures in the aggregate testing specifications. Mechanisms of failure due to polishing abrasion resistance, strength parameters, erosion resistance and bonding between aggregates and binders are investigated. The aggregates used in strength assessment were all basalts from the Antrim Plateau in Northern Ireland. Ten quarries were sampled giving a total of 13 samples of which four were regarded as inferior. Sampling was carried out to BS 812 and the Los Angeles abrasion test was included. Regression analysis showed this test to be a consistent method of detecting weak materials and a means of predicting aggregate impact values (aiv) and aggregate crushing values (acv). The authors suggest that the established dorry aggregate abrasion value test can exhibit a bias at the sample preparation stage which can result in only 20 per cent of the bulk material being effectively tested. Regression analysis suggests that the Los Angeles test is a better indicator of strength than the dorry apparatus. It was also found that polishing characteristics were more closely linked to differential wear than rate of wear and the magnesium sulphate soundness test can be used to assess the resistance to erosion by natural elements. (TRRL)

  • Availability:
  • Corporate Authors:

    Quarry Managers' Journal Limited

    7 Regent Street
    Nottingham NG1 5BY,   England 
  • Authors:
    • PEDEN, R A
  • Publication Date: 1983-8

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 493-497
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00381198
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD, TRIS
  • Created Date: Apr 30 1984 12:00AM