DAMAGE TO NEW HAMPSHIRE HIGHWAYS FROM FROST ACTION

SPRING BREAKUP, OR DAMAGE BY FROST ACTION, IS EXPENSIVE IN THE STATE OF NEW HAMPSHIRE. IN ATTEMPTING TO ARRIVE AT A FAIR COST OF SPRING BREAKUP AN APPROXIMATION WAS REACHED BY USING ALL COSTS CHARGED DIRECTLY AGAINST THE PAVEMENT DURING THE FIRST SIX MONTHS OF EACH YEAR. A BREAKDOWN IS PRESENTED OF PAVEMENT REPAIR COSTS BY TYPE. THE GRAVEL ROAD WITH A TAR SURFACE TREATMENT IS PREDOMINANT. SOIL CONDITIONS ARE CHARACTERIZED BY A PLENTIFUL SUPPLY OF ROCK. THE DRIFTS AND TILLS ARE VERY NEARLY IDEAL IN GRADING AND HAVE GREAT LOAD-BEARING VALUE WHEN BELOW THE FROST PENETRATION DEPTH. LARGE DEPOSITS OF GLACIAL SAND AND GRAVEL ARE FOUND THOROUGHOUT THE STATE AND ARE OF EXCELLENT QUALITY. TRUE CLAYS ARE RARE IN NEW HAMPSHIRE AND OCCUR MOSTLY NEAR THE OCEAN AS DRIED-OUT BLUE MARINE CLAY. SILT, OR A MIXTURE OF FINE SAND AND SILT, IS RESPONSIBLE FOR THE MAJORITY OF THE DIFFERENTIAL FROST HEAVES SO PREVALENT IN THE SPRING. THE PRESENCE OF COPIOUS AMOUNTS OF WATER IN SHALLOW UNDERFROUND STREAMS COMPLICATES THE SOIL ENGINEER'S PREDICTION OF FUTURE FROST HEAVES. FROST HEAVES ARE COMMON IN LEDGE EXCAVATION AND A 2-FT. GRAVEL BASE COURSE IS ALWAYS CONSTRUCTED THROUGH THE LEDGE SECTIONS. BOULDERS BENEATH THE SURFACE HAVE BEEN THE CAUSE OF MUCH ROUGH-RIDING PAVEMENT AND ARE NOT ALWAYS SUSPECTED OF BEING RESPONSIBLE SINCE THE STRENGTH OF THE PAVEMENT HAS A TENDENCY TO FLATTEN OUT THE HEAVES. FIGURES ARE PRESENTED ILLUSTRATING TYPICAL HIGHWAY DESTRUCTION THROUGH FROST DAMAGE.

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  • Accession Number: 00237856
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 26 1970 12:00AM