Public works . 6 occurring before the joints were cut and 8 ^fterthe joints were cut. There is no doubt that thechange of traffic prevented further failures on thatside of the pavement. That the opening of the cracks and joints, due tocold weather, makes a marked difiference in the car-rying capacity of a given pavement is shown bj theresults obtained from this test. Only two cornerlireaks occurred during the 1,167 applications of the3,500-pound load before the joints were cut, but 7corner breaks occurred during the following 1,000applications of the same load applied after the jointshad been
Public works . 6 occurring before the joints were cut and 8 ^fterthe joints were cut. There is no doubt that thechange of traffic prevented further failures on thatside of the pavement. That the opening of the cracks and joints, due tocold weather, makes a marked difiference in the car-rying capacity of a given pavement is shown bj theresults obtained from this test. Only two cornerlireaks occurred during the 1,167 applications of the3,500-pound load before the joints were cut, but 7corner breaks occurred during the following 1,000applications of the same load applied after the jointshad been opened. Apparently the night loading was little if anymore serious than the day loading, possibly due to thefact that the subgrade had been crowded away fromunderneath the edge of the pavement before thenight runs were made, by the continuous applicationsof the truck loads along the edges. If this is thecondition, the stress during day loading to which theslab was subjected would be as great as during night. loading, which would account for the fact that as aresult of the 1,033 applications of the night loads,with joints open, only two additional breaks were ob-served, while as a result of applications of dayloads applied just previous and under the same con-ditions, six breaks occurred. The next increment of load to be applied will besuch that each of the rear wheels will carry 4,500pounds, and each of the front wheels 2,000 load on the front wheels is lessened under thisload due to the increased weight in the rear takingsome weight off of the front of the truck. One thou-sand or more applications of this load will be made inthe day runs and there is some possibility of runningthe same number at night, this latter step to be con-sidered after the completion of the day run. I June 10, 1922 PUBLIC WORKS 425 BEHAVIOR OF SECTIONS. Six of the sections were of bituminous-filled brickon macadam base. Four of these were considered tohave totally failed after the passa
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectmunicip, bookyear1896
