EFFECT OF FLAT AND ELONGATED PARTICLES IN MINERAL AGGREGATES

THE PURPOSE IS TO CITE DEFINITE AVAILABLE INFORMATION ON THE EFFECT OF FLAT AND ELONGATED PARTICLES AND TO SUGGEST PROCEDURE FOR INVESTIGATIONS. ALTHOUGH SPECIFICATIONS HAVE COMMONLY DRAWN DISCRIMINATORY LINES AGAINST SUCH MATERIAL, THERE ARE LITTLE DATA TO BASE DEFINITE REQUIREMENTS. RESEARCH CONDUCTED BY THE NATIONAL CRUSHED STONE ASSOCIATION AND THE NATIONAL SAND AND GRAVEL ASSOCIATION INDICATE THAT FLAT AND ELONGATED PARTICLES IN THE AMOUNTS TO BE EXPECTED IN PRACTICE (10 TO 15 PERCENT) DO NOT HAVE DELETERIOUS EFFECTS UPON WORKABILITY, STRENGTH, FINISH AND QUALITY OF SURFACE OF CONCRETE. SOME TESTS REPORTED BY GILKEY ON SPECIALLY PREPARED AGGREGATES WHERE THE COARSE AGGREGATE CONSISTED ENTIRELY OF FLAT PARTICLES INDICATED SOME WEAKNESS. IT IS CONCLUDED THAT FURTHER INVESTIGATIONS ARE REQUIRED BEFORE GENERALLY ACCEPTABLE CONCLUSIONS CAN BE DRAWN AND SUGGESTIONS FOR PROCEDURES ARE MADE.

  • Supplemental Notes:
    • Vol 10, pp 93-100; part of Report of Project Committee on Correlation of Research in Mineral Aggregates
  • Authors:
    • WALKER, S
  • Publication Date: 1931

Media Info

  • Monograph Title: Proceedings of the Tenth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 11-12, 1930
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217822
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jun 1 1971 12:00AM