FUNDAMENTAL INVESTIGATION ON THE COMPACTION OF CONCRETE ROAD SLABS BY SURFACE VIBRATION

A SYSTEMATIC ROAD INVESTIGATION WAS CONDUCTED ON THE COMPACTION CHARACTERISTICS OF VIBRATING BEAMS, SUCH AS AMPLITUDE, FREQUENCY, ACCELERATION AND RUNNING SPEED OF CONCRETE FINISHERS TO DETERMINE THE FACTORS FOR A SATISFACTORY COMPACTION OF CONCRETE ROAD SLABS BY SURFACE VIBRATION. COMPACTING CHARACTERISTICS OF CONCRETE ROAD FINISHERS ARE DISCUSSED FROM A STANDPOINT OF COMPACTING EFFECT. THE PROPAGATING CHARACTERISTICS OF ACCELERATION, FROM A VIBRATING BEAM TO FRESH CONCRETE PARTICLES WERE STUDIED TOGETHER WITH THE RELATION BETWEEN THE PROPAGATED ACCELERATION AND PROPERTIES OF HARDENING CONCRETE. SOME USEFUL INDICES ARE GIVEN FOR EVALUATING COMPACTION EFFECTS AND THEIR REASONABLE CRITERIA. IT IS DETERMINED THAT AS LONG AS THE MAGNITUDE OF ACCELERATION OF THE VIBRATING BEAM REMAINS REASONABLE FOR A PERIOD OF PARTICULAR CONSISTENCY OF CONCRETE, THE RUNNING SPEED OF THE FINISHER CAN BE RAISED UP TO 100 CM/MIN, WITHOUT ANY DISADVANTAGES TO COMPACTION OF CONCRETE ROAD SLABS. REASONABLE MAGNITUDES ARE PRESENTED OF ACCELERATION FOR CONCRETE ROAD FINISHERS' VIBRATING BEAM. THESE MAGNITUDES WILL DETERMINE THE PROPAGATING EFFICIENCY OF ACCELERATION FROM THE BEAM TO FRESH CONCRETE PARTICLES, TOGETHER WITH RELATIONSHIPS BETWEEN PROPAGATED ACCELERATION OF CONCRETE PARTICLES AND PROPERTIES OF HARDENED CONCRETE DEPENDING ON CONSISTENCY OF FRESH CONCRETE. PHYSICAL PROPERTIES ARE EVALUATED OF HARDENED CONCRETE ROAD SLABS, COMPACTED BY SURFACE VIBRATIONS. RATIOS ARE GIVEN FOR PROPERTIES OF CONCRETE LAYER RATIOS. THE RATIOS OF THE LOWER TO THE UPPER LAYER GIVEN ARE NOT LESS THAN 0.98 FOR WET DENSITIES AND NOT LESS THAN 0.92 FOR SPLIT (INDIRECT) TENSILE STRENGTHS, WITH CORES OF 15 CM IN DIAMETER, BEING SLICED INTO TWO LAYERS, THE UPPER AND LOWER.

  • Supplemental Notes:
    • Vol 11, pp 33-63, 21 FIG, 1 REF
  • Corporate Authors:

    Public Works Res Inst, Cm /Japan

    /Journal of Research
    ,   USA 
  • Authors:
    • Nagamori, M
  • Publication Date: 1966

Subject/Index Terms

Filing Info

  • Accession Number: 00214821
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 3 1994 12:00AM