COLD-ROOM STUDIES OF FROST ACTION IN SOILS

COLD-ROOM STUDIES OF FROST ACTION IN SOILS ARE BEING PERFORMED BY THE FROST EFFECTS LABORATORY, NEW ENGLAND DIVISION, CORPS OF ENGINEERS, FOR THE AIRFIELDS BRANCH, OFFICE, CHIEF OF ENGINEERS, DEPARTMENT OF THE ARMY, AS PART OF A CONTINUING PROGRAM OF FROST INVESTIGATIONS AIMED TOWARD ESTABLISHING AND IMPROVING DESIGN AND EVALUATION CRITERIA FOR ROADS, HIGHWAYS AND AIRFIELD RUNWAYS CONSTRUCTED ON SOILS SUBJECT TO SEASONAL FREEZING AND THAWING. THE PRESENT LABORATORY STUDIES ARE BEING MADE CHIEFLY TO DETERMINE THE QUANTITATIVE EFFECTS OF INDIVIDUAL FACTORS WHICH INFLUENCE ICE SEGREGATION IN SOILS, SUCH AS GRADATION, PERCENT FINER THAN 0.02 MM., PERCENT STONE, PERMEABILITY, CAPILLARITY, PROXIMITY OF WATER SUPPLY, COMPACTION, AND THE INITIAL DEGREE OF SATURATION IN CLOSED SYSTEM. THE CHIEF PURPOSE OF THIS PAPER IS TO PRESENT THE TESTING PROGRAM AND METHODS AND EQUIPMENT USED. THE COLD-ROOM STUDIES WERE BEGUN IN FEBRUARY 1950 AND ARE CURRENTLY IN PROGRESS. THE DATA PRESENTED HEREIN ARE INCOMPLETE, AND FINAL CONCLUSIONS MUST AWAIT THE COMPLETION OF THE VARIOUS PHASES OF THE INVESTIGATION. THE DATA AVAILABLE INDICATE THAT PERCENTAGE FINER THAN 0.02 MM. SIZE IS NOT, BY ITSELF, AN ADEQUATE INDICATOR AND THAT OTHER FACTORS MUST BE CONSIDERED IN RECOGNIZING WITH ACCURACY A FROST-SUSCEPTIBLE SOIL OR IN PREDICTING THE INTENSITY OF ICE SEGREGATION POSSIBLE IN A GIVEN SOIL. TESTS HAVE SHOWN THE CHARACTER & DISTRIBUTION OF THE FINES HAVE AN IMPORTANT BEARING ON FROST SUSCEPTIBILITY. IN SOME SOILS THE DEGREE OF COMPACTION AT THE START OF FREEZING HAS A MARKED EFFECT ON THE AMOUNT OF HEAVE WICH OCCURS. IN OTHER SOILS THE EFFECT MAY BE SMALL. IN SOME A CRITICAL DEGREE OF COMPAACTION MAY OCCUR AT WHICH ICE SEGREGATION IS MOST INTENSE, WITH LESS HEAVING OCCURRING AT DENSITIES HIGHER OR LOWER THAN THE CRITICAL DENSITY. CLOSED-SYSTEM TESTS ON A SATURATED LEAN CLAY INDICATE CONSIDERABLE ICE SEGREGATION CAN OCCUR WITHOUT WATER BEING AVAILABLE FROM AN OUTSIDE SOURCE. /AUTHOR/

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  • Accession Number: 00237855
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 26 1970 12:00AM