TRAFFIC TEST ON TURF SHOULDER

THE TEST SHOULDER ADJOINS A 24-FT. CONCRETE HIGHWAY WHICH WAS COMPLETED IN JULY, 1950. REGULAR MAINTENANCE OPERATIONS WERE RESUMED AT THIS TIME. TRAFFIC VOLUME OVER THE HIGHWAY AT THE POINT OF THE TEST AVERAGE 3,520 VEHICLES PER 24 HOURS. AUTOMOBILES COMPRISE APPROXIMATELY 60 PERCENT OF THE TRAFFIC AND TRUCKS 40 PERCENT. ON MAY 3 THE AREA HAD 4.75 OF RAINFALL AND 1/2 IN. OF RAINFALL ON MAY 4. IT IS PROBABLE THAT THE SOIL MOISTURE CONCENT WAS HIGH ENOUGH TO CONSIDER THE SHOULDER IN THE WORST CONDITION OF THE YEAR IN RESPECT TO STABILITY. ON APRIL 22, 1953, SOIL SAMPLES WERE TAKEN TO DETERMINE TEXTURE, DENSITY, AND PLASTIC INDEX. SOIL SAMPLES FOR DETERMINING MOISTURE CONTENT WERE TAKEN THE DAY THE ACTUAL TEST WAS RUN. THE REQUIRED 18,000-LB. AXLE LOAD WAS OBTAINED BY USING A 3-TON DUMP TRUCK WITH DUAL REAR WHEELS AND LOADED WITH 5 YD. OF SAND CLAY GRAVEL. THE TRUCK MADE 31 PASSES OVER THE TEST SHOULDER, WHICH WAS CONSIDERED SUFFICIENT TO DETERMINE THE DEGREE OF STABILITY. WITH 90--95% OF THE SAMPLES PASSING A NO. 270 SIEVE, DRY DENSITY RANGED FROM 104 TO 110 LB PER CU FT, OR 92.1 TO 98.9% OF MAXIMUM DENSITY. FOR AN OPTIMUM MOISTURE CONTENT OF 14.4% THE RANGE OF MOISTURE CONTENTS AT 1--3 AND 3-7 INCHES WAS, RESPECTIVELY, 17.6-21.1 AND 17.5 --19.9%. AT 21 MEASURING POINTS DEFLECTIONS RANGE FROM 0.5 TO 0.875 INCH AFTER 31 PASSES.

  • Supplemental Notes:
    • No 318, pp 16-21, 2 TAB
  • Publication Date: 0

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Filing Info

  • Accession Number: 00205072
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 15 1971 12:00AM