The paper reports work continuing two earlier researches and exploiting further the use of ultrasonic-pulse-velocity tests to examine the internal structure of concrete and its influence upon certain physical and mechanical properties. It is found that binary aggregate proportions affect (a) the relationships between paste pulse velocity and cube strength and (b) the dynamic elastic moduli of cement paste; mortar, quasi-mortar (cement paste plus coarse aggregate) and concrete phases and also have some influence upon the workability of concrete. For the particular mixes tested, the maximum dynamic modulus, maximum concrete pulse velocity and the maximum loose and rodded bulk densities of the combined aggregates all occurred at the optimum coarse-aggregate content for workability. The test further confirmed that, in predicting the elastic modulus of concrete, the elastic modulus of the quasimortar merits as much consideration as that of the mortar itself. The curves for both moduli due to changes in the volume fraction of sand and coarse aggregates intersect at a point influenced by the age of the concrete. (A) /TRRL/

  • Availability:
  • Corporate Authors:

    An Foras Forbartha

    St Martin's House, Waterloo Road
    Dublin 4,   Ireland 
  • Authors:
    • Nwokoye, D N
  • Publication Date: 1975-12

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 229-238
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00137522
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 26 1976 12:00AM