A contractor has been awarded a contract for the construction of a 2-mile access road connecting a..

A contractor has been awarded a contract for the construction of a 2-mile access road connecting a new residential development with a highway. The contractor needs to haul gravel (medium coarse stone) from a borrow source that is located a mile from the construction site. The contractor has decided to use articulated end-dump trucks to haul the gravel and to use a wheeled loader to load the trucks. The gravel weighs 3,100 pounds per bank cubic yard and has a swell of 14%. The loader is equipped with a 3.7-cubic-yard bucket and has a cycle time estimated to be 35 seconds. The average haul

A contractor has been awarded a contract for the construction of a 2-mile access road connecting a new residential development with a highway. The contractor needs to haul gravel (medium coarse stone) from a borrow source that is located a mile from the construction site. The contractor has decided to use articulated end-dump trucks to haul the gravel and to use a wheeled loader to load the trucks. The gravel weighs 3,100 pounds per bank cubic yard and has a swell of 14%. The loader is equipped with a 3.7-cubic-yard bucket and has a cycle time estimated to be 35 seconds. The average haul distance will be 1.5 miles. The haul road has a downhill grade of 2% for the first half mile, an uphill grade of 3% for the second half mile, and is generally level for the remaining half mile when traveling from the load site to the dump site. The rolling resistance of the first mile of the haul road is estimated to be 100 pounds per ton and for the last half mile to be 60 pounds per ton when traveling from the load site to the dump site. The coefficient of traction of the haul road is estimated to be 0.4. Manufacturers information about the dump truck is provided in Example 12.1. The maximum safe speed for the truck is 31.6 miles per hour. A performance chart for the dump truck is shown in Figure 12.7. The hourly ownership, operating, and labor cost for the dump truck is estimated to be $165 and for the loader is estimated to be $155. Job site conditions at both the load and dump site are considered favorable. a. What is the estimated productivity of one dump truck in loose cubic yards per hour, if the contractor works 50 minutes per hour and the truck does not wait in a queue to be loaded? Road conditions limit the maximum safe speed of the trucks to 30 miles per hour. b. How many dump trucks should the contractor use with one loader to minimize the loading and hauling cost? c. What is the estimated unit cost for loading and hauling the gravel with the number of trucks determined in b above?

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