Chapter 10, Problem 7RQ

A Highway contractor has four locations A, B, C, and D on a road contract which crushed stone is to be delivered. The stone, which is all of the same quality is to be supplied from three quarries 1, 2, and 3. The table below shows the relative transportation cost per cubic meter of transporting stone from each quarry to each site. However, the contractor discovered a technical problem in the third quarry, which results in a temporary shutdown of the facility. Based on this new condition, the contractor must deliver the crushed stone from the first and the second quarries only. Any shortage in the required crushed stone has to be covered from an external source.   a) What is the optimal allocation of the crushed stone from each quarry to each location under the new circumstances? b) What is the transportation cost corresponding to the solution obtained in part a? c) Which of the four sites are affected by the shortage that results from the shutdown of the third quarry?

A project to move packed earth requires you to decide whether to usea dozer/scraper operation or excavator/truck operation. Determinethe most economical operation based on the dozer/scraper operationestimated at $1.25/cy. All equipment carries a rated heaped capacity, hasa fill factor of 100%, and works 45-min hours. Excavator costs $95/hr（including operator), cycle time is 0.28 min, and bucket heaped capacityis 5.0 cy. Truck costs $150/hr.(including operator), dump time is 0.5 min（maneuver, dump, turn), heaped capacity is 31.7 cy, and 12 trucks areavailable for the project.Hauling equipment operates in one directionfrom A to B to C and finally to D. Section      Load         Length (ft)       Speed (mph) A                full              3000                    9B                full              2500                   17C             empty           3000                   36D             empty          3000                   16

Assuming that each load is a full-capacity load, howmany truckloads are required to construct the fill?

An excavator was able to load a truck in 2 minutes and additional 30 seconds for the positioning of the truck. The hauling time, dumping time, and return time of the truck is about 25mins. What is the equipment utilization of the excavator if there are only eight trucks available during the loading operations?

Calculate the cost per cubic yard to place concrete using each of the alternatives described. The work in both cases consists of placing 140 cubic yards of concrete in footings. a. Using a crane and bucket at a price of $225 per hour, including an operator, with a crew consisting of 6 laborers, a cement finisher, and a foreman. The concrete will be placed in 7 hours using this setup, and transportation of the crane costs $390. b. Using a concrete pump at a price of $295 per hour, including an operator and a crew consisting of 5 laborers, a cement finisher, and a foreman. With this setup, concrete is placed in 6 hours and transportation of the pump costs $290.

Given the following information, determine the cost of excavation, the number of loads required toremove the material and how many days it will take to complete the job.o 5225m3 of material is to be excavatedo Equipment cost is $280/houro Operator cost is $55/houro Equipment can remove 55m3/houro Assume 20% swell in soil when excavated for removal off siteo Trucks can carry 10m3o Work 10hr days

A hydraulic excavator was able to load a truck in 2 minutes and additional 30 seconds for the positioning of the truck. The hauling time, dumping time, and return time of the truck is about 25mins. What is the equipment utilization of the excavator if there are only eight trucks available during the loading operations? complete solution

What is the aim of Jar test? And how can we choose the best coagulants?

You're the project manager/engineer designing an Agitated Cement Slurry Storage Basin to be built on a mine site. 11. Specify arrangement and assembly requirements. 12. Advise stakeholders of selection and make any required adjustments