In order to assess the influence of clay and silt present in aggregates upon the quality of concrete, investigations were made into the nature of the fine particles (visual appearance, mineralogical composition, loss on ignition, ph value, fulvic acid content and particle size) and the influence of variable amounts of clay and silt upon the properties of cement mortar and concrete (water cement ratio, slump, density, air content, flexural strength, compressive strength, splitting tensile strength, shrinkage and resistance to freezing). It was found that particles smaller than 63 micrometres are composed of silicic acid compounds and various clay minerals. An increasing content of such particles in mortar or concrete caused an increase of the water cement ratio at a given consistency, increase of shrinkage and decrease of strength. The nature of the silt and clay did not matter. The detrimental effect upon the strength was greater as the hardening time became shorter. There was a linear relation between the shrinkage and the clay and silt content. /TRRL/

  • Availability:
  • Corporate Authors:

    NV'T Koggeschip

    P.O. Box 1198
    Amsterdam C,   Netherlands 
  • Authors:
    • Wiebenga, J G
  • Publication Date: 1977-12


  • Dutch

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 577-584
  • Serial:
    • Cement
    • Volume: 29
    • Issue Number: 12
    • Publisher: Vereniging Nederlandse Cementindustrie
    • ISSN: 0008-8811

Subject/Index Terms

Filing Info

  • Accession Number: 00179888
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Sep 27 1978 12:00AM