FINAL REPORT OF COMMITTEE ON LOAD-CARRYING CAPACITY OF ROADS AS AFFECTED BY FROST ACTION

AN INVESTIGATION WAS UNDERTAKEN BY THE HIGHWAY RESEARCH BOARD TO STUDY THE LOSS OF LOAD-CARRYING CAPACITY SUFFERED BY ROADS BECAUSE OF FROST ACTION. THE FOLLOWING TEN STATES LYING WITHIN FROST-AFFECTED AREAS AGREED TO TAKE PART IN THE RESEARCH WORK: INDIANA, IOWA, MICHIGAN, MINNESOTA, NEBRASKA, NEW HAMPSHIRE, NEW YORK, NORTH DAKOTA, OHIO, AND OREGON. BEGINNING IN 1948, A PROGRESS REPORT WAS PREPARED AND SUBMITTED AT EACH ANNUAL MEETING OF THE HIGHWAY RESEARCH BOARD UP TO AND INCLUDING 1955. SUMMARIES ARE PRESENTED OF EACH OF THESE REPORTS. THE RESEARCH PROJECT WAS DESIGNED TO DETERMINE, BY ACTUAL FIELD TESTING, THE LOSS OF LOAD- CARRYING CAPACITY EXHIBITED BY HIGHWAYS DURING THE TIME THE FROST IS LEAVING AND AFTER THE FROST HAD LEFT THE GROUND. TO EVALUATE THE CARRYING CAPACITY OF ROADS, HEAVY-DUTY, PORTABLE LOAD-APPLICATION EQUIPMENT DEVELOPED BY MINNESOTA WAS ADOPTED AND GENERALLY USED BY THE PARTICIPANTS. THIS MACHINE WAS SELF-PROPELLED, EASILY PORTABLE, AND CAPABLE OF APPLYING A REACTION LOAD UP TO 28,000 POUNDS. EIGHT OF THE TEN PARTICIPATING STATES USED THE PLATE-BEARING METHOD OF TESTS. TWO STATES (MICHIGAN AND IOWA) USED SPECIAL TESTING DEVICES. INCLUDED AS APPENDICES ARE SPECIFIC REPORTS BY OREGON AND INDIANA. RESULTS OF PLATE-LOAD AND OTHER TESTS MADE BY THE STATES POINT CONCLUSIVELY TO THE FACT THAT FROST ACTION REDUCES THE ABILITY OF SUBGRADE SOILS AND PAVEMENTS TO SUPPORT LOADS. FINE-GRAINED SOILS INCLUDING SILTS, SILTY CLAYS, CLAY LOAMS, PLASTIC SANDY LOAMS, AND CLAYS, ARE AFFECTED MORE ADVERSELY BY FROST ACTION THAN ARE SOILS OF A GRANULAR NATURE. THE ADVERSE EFFECT IS DEPENDENT UPON THE SEVERITY OF THE FROST ACTION. THE LOSS IN LOAD SUPPORTING ABILITY OF SOILS AS A RESULT OF FROST ACTION DOES NOT APPEAR TO BE DUE TO CHANGES ONLY IN THE MOISTURE CONTENT OR THE DENSITY OF THE MATERIAL. IT IS BELIEVED THAT THE LOSS MAY BE DUE TO THE MANNER IN WHICH THE MOISTURE IS PRESENT IN THE SOIL OR TO THE DEGREE OF SATURATION OF THE MATERIAL (THE PRECENT OF VOIDS FILLED WITH WATER). RESEARCH WORK INDICATES THAT THE PLATE-LOAD METHOD OF TEST MAY BE USED TO DEVELOP INFORMATION ON LOAD-CARRYING CAPACITY OF EXISTING PAVEMENTS AND AS A USUAL TOOL IN THE DESIGN OF NEW PAVEMENTS. TESTS DEMONSTRATE THAT IT IS POSSIBLE TO BUILD PAVEMENTS OF THE FLEXIBLE TYPE THAT WILL NOT BE AFFECTED APPRECIABLY BY FROST ACTION.

Media Info

  • Monograph Title: Load-carrying capacity of roads as affected by frost action
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00237539
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 22 1994 12:00AM