DEVELOPMENTS OF THE TWO-POINT WORKABILITY TEST FOR HIGH-PERFORMAN CONCRETE

An improved version of the Tattersall two-point workability appar has been developed for the study of the rheology of high-performa concrete mixes. The improvements include a more compact arrangem of motor, impeller and bowl and the computer logging of the speed/torque data so that the flow curve can be obtained in a continuous sweep of about 30 s. Two impeller systems were used - axial interrupted helix and an H-shaped impeller driven in a planetary motion with an offset gear, that is corresponding to th and LM systems on the previous apparatus. Both impeller systems calibrated to enable the Bingham parameters of yield stress and plastic viscosity to be expressed in fundamental units. The performance of the apparatus was assessed by tests on a range of moderately high-performance mixes incorporating superplasticizers cement replacement materials. The offset H impeller system was f to be suitable for testing concrete with slumps ranging from abou mm up to collapse, and for assessing the development of rheology time after mixing, and is therefore preferred for high-performanc concrete. (A)

  • Availability:
  • Corporate Authors:

    Thomas Telford Limited

    London,   United Kingdom 
  • Authors:
    • DOMONE, PLJ
    • YONGMO, X
    • Banfill, PFG
  • Publication Date: 1999-6

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 171-9
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00767236
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD,
  • Created Date: Aug 6 2001 12:00AM