FROST PENETRATION BENEATH CONCRETE SLABS MAINTAINED FREE OF SNOW AND ICE, WITH AND WITHOUT INSULATION

RESULTS ARE PRESENTED OF AN INVESTIGATION RELATIVE TO THE PREDICTION OF FROST PENETRATION IN SOILS BENEATH CONCRETE SLABS, BOTH INSULATED AND UNINSULATED. A ONE-DIMENSIONAL PERIODIC HEAT FLOW SOLUTION OF THE FOURIER CONDUCTION EQUATION WAS USED TO DETERMINE THE EFFECT OF CONCRETE AND/OR INSULATION IN REDUCING FROST PENETRATION. FOR SIMPLICITY, THE SOLUTION ASSUMED AN ANNUAL SINUSIODAL TEMPERATURE DISTRIBUTION AT THE SURFACE BOUNDARY. THE FREEZING INDEX AT THE CONCRETE-SOIL INTERFACE (AND INSULATION-SOIL INTERFACE) WAS FOUND BY CALCULATING THE AMPLITUDE OF THE SINUSIODAL TEMPERATURE WAVE AT THIS DEPTH AND THEN CONVERTING IT TO A FREEZING INDEX. THIS FREEZING INDEX WAS THEN USED IN THE MODIFIED BERGGREN EQUATION TO CALCULATE THE DEPTH OF FROST PENETRATION INTO THE UNDERLYING SOIL. DURING THE 1960-61 WINTER SEASON, SUBSURFACE TEMPERATURES WERE RECORDED AT THREE SMALL-SCALE CONCRETE-SLAB TEST SECTIONS AT WALTHAM, MASS. THE SLABS WERE 8, 12, AND 24 IN. IN THICKNESS. A 2-IN. LAYER OF INSULATION WAS PLACED UNDER THE 8-IN. SLAB. SLAB SURFACES WERE EXPOSED TO THE NATURAL CLIMATIC INFLUENCES AND WERE GENERALLY KEPT FREE OF SNOW AND ICE. RESULTS INDICATED REASONABLE AGREEMENT BETWEEN ACTUAL AND PREDICTED DEPTHS OF FROST PENETRATION FOR THE UNINSULATED SLABS AND SUGGESTED A SOLUTION FOR FROST PENETRATION PROBLEMS IN A MULTILAYER PROFILE OF PORTLAND CEMENT CONCRETE, INSULATION, AND SOIL. /AUTHOR/

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  • Authors:
    • Quinn, William F
    • Lobacz, Edward F
  • Conference:
  • Publication Date: 1962

Media Info

  • Media Type: Digital/other
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 98-115
  • Monograph Title: Soil behavior associated with freezing
  • Serial:

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Filing Info

  • Accession Number: 00237501
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 9 1994 12:00AM