A contractor has been awarded a contract for the construction of a building complex that will be…

A contractor has been awarded a contract for the construction of a building complex that will be occupied by an automobile dealer. A major part of the site work for the project is the construction of a structural fill that will be paved and used to store new automobiles. Review of the contract drawings and specifications indicates that the compacted fill will average 15 inches in depth and cover an area 200 feet by 250 feet. The contractor has located a suitable source for the fill material that is 2 miles from the construction site. Compaction tests on fill material (rockdirt mixture)

A contractor has been awarded a contract for the construction of a building complex that will be occupied by an automobile dealer. A major part of the site work for the project is the construction of a structural fill that will be paved and used to store new automobiles. Review of the contract drawings and specifications indicates that the compacted fill will average 15 inches in depth and cover an area 200 feet by 250 feet. The contractor has located a suitable source for the fill material that is 2 miles from the construction site. Compaction tests on fill material (rockdirt mixture) indicate a unit weight of 114 pounds per compacted cubic foot at the design density, a shrinkage of 15%, and a swell of 20%. The contractor plans to use four 18-cubic-yard end-dump trucks to haul the fill material to the construction site. The trucks weigh 32,000 pounds empty and can carry a maximum load of 20 tons. They are powered by a 170-horsepower diesel engine with a gear train efficiency of 78%. The maximum safe speed for the trucks is 26 miles per hour. The contractor determined the weight distribution in Table 12.7 from the manufacturers literature. The haul road has an uphill grade of 2% for the first half mile, a downhill grade of 1% for the next mile, and an uphill grade of 4% for the last half mile when traveling from the borrow (load) site to the project (dump) site. The contractor plans to maintain the haul road and estimates the resulting rolling resistance will be about 80 pounds per ton and the coefficient of traction will be about 0.5. The contractor plans to load the dump trucks at the borrow site with a wheeled loader that has a 4.1-cubic-yard bucket and a cycle time estimated to be 45 seconds. The job conditions at the dump site are considered average and at the borrow site are considered favorable. a. What do you estimate the cycle time to be for one dump truck? b. What is the estimated productivity of one dump truck in compacted cubic yards per hour, if the contractor works 50 minutes per hour and the trucks do not wait in a queue to be loaded? c. How many eight-hour days do you estimate it will take the contractor to haul the fill material needed to construct the parking area?

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