A contractor has just been awarded a condract to construct a parking lot for a s
ID: 1713797 • Letter: A
Question
A contractor has just been awarded a condract to construct a parking lot for a small shopping center. The soil conditions are very poor, and the designer has decided to bridge over the poor material with a structural fill 3 feet deep. The total estimated volume of material required is 14,000 compacted cubic yards. The fill material is a sandy clay weighing 2,600 pounds per bank cubic yard. The swell for the fill material is estinated to be 25%, and the shrinkage at the design density is estinated to be 15%. The contractor has selected a borrow source that is a half mile from the construction site. The contractor plans to maintain the haul road with a grader, and the resulting rolling resistance is estimated to be 55 pounds per ton. The coefficient of traction is estimated to be 0.6 The haul road has an uphill grade of 2% when trav. eling from the construction site to the borrow site. Job conditions are considered to be favorable. The contractor plans to use Caterpillar 615C Series II elevating scrapers to construct the fill. How many scrapers should the contractor use to complete the fill in 5 days, ifhe works 50 minutes per hour and 9 hours per day?Explanation / Answer
ANSWER
1.Cater Piller 615 C Series II Heaped Capacity - 17 Cu. yard
Volume of Material required - 14000 Cu .Yard
Include Shirinkage 15% - (14000 x 15%) = 16100 Cu.yad
Include Swell 25% - (16100 x 25%) = 20125 Cu.yad
Total Volume of Material required - 20125 Cu.yard
Total loads required - (20125 / 17) = 1183.82 loads
If he works 50 minutes per hours he will work as 7.2 hours per day
for 2% garde with the time elapse for half mile will be 20 minutes per load
So Totally for 5 days x 7.2 hours = 36 hours
One cater piller may 5 loads per hours and for 7.2 hours
The Total Vechicle reqyuired = (1183.82 / (36*5)) = 7 Nos
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