STUDIES OF WORKABILITY OF CONCRETE

THE WORKABILITY OF CONCRETE MIXTURES IS STUDIED BY THE REMOLDING TEST WHICH MEASURES THE RELATIVE EFFORT REQUIRED TO CHANGE A MASS OF CONCRETE FROM ONE DEFINITE SHAPE TO ANOTHER BY MEANS OF JIGGING. THE CHANGE IN SHAPE INVOLVES FLOW UNDER CONDITIONS WHICH CAN BE VARIED AT WILL. THE AMOUNT OF EFFORT, CALLED REMOLDING EFFORT, IS TAKEN AS THE NUMBER OF JIGS REQUIRED TO COMPLETE THE CHANGE. THE METHOD AND APPARTUS ARE DESCRIBED. THIS TEST DOES NOT OFFER A COMPLETE MEASURE OF WORKABILITY, BUT DOES APPEAR TO PROVIDE A GOOD INDICATION OF THE AMOUNT OF PLACING EFFORT WHICH A MIX WILL REQUIRE UNDER CERTAIN CONDITIONS. THE TEST MAKES DISTINCTIONS BETWEEN MIXES TO A DEGREE WHICH HAS BEEN IMPOSSIBLE PREVIOUSLY. WORKABILITY IS DETERMINED BY THE COMBINED EFFECTS OF THE FOLLOWING FACTORS: (1) THE QUANTITY OF CEMENT-WATER PASTE PER UNIT VOLUME OF CONCRETE, (2) THE CONSISTENCY OF THE PASTE, AND (3) THE GRADATION AND TYPE OF THE AGGREGATE. ALTHOUGH A MARKED DISSIMILARITY IS SHOWN BETWEEN THE REMOLDING TEST AND EITHER THE SLUMP OR FLOW TEST, THE DIFFERENCES ALWAYS SEEM TO SHOW THE REMOLDING TEST TO HAVE GREATER SENSITIVITY TO VARIABLES OF KNOWN EFFECT.

  • Supplemental Notes:
    • Vol 28, pp 419-448, 12 FIG, 1 TAB, 2 APP
  • Authors:
    • Powers, T C
  • Publication Date: 1932-2

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  • Accession Number: 00212656
  • Record Type: Publication
  • Source Agency: Highway Research Board Bibliography
  • Files: TRIS
  • Created Date: Jun 24 1994 12:00AM