RIBNA has estimated 200 m³ concrete and 800 dowels to complete a concrete paving project. 60 work hours is estimated to make dowel baskets and anchor them to the base course. A slipform paver, in 40 work hours, spreads, consolidates, and finishes the concrete slab. On a study date, 600 dowels in 45 work hours and 120 m³ concrete in 30 work hours are used.

RIBNA has estimated 200 m³ concrete and 800 dowels to complete a concrete paving project. 60 work hours is estimated to make dowel baskets and anchor them to the base course. A slipform paver, in 40 work hours, spreads, consolidates, and finishes the concrete slab. On a study date, 600 dowels in 45 work hours and 120 m³ concrete in 30 work hours are used.

Fundamentals Of Construction Estimating

4th Edition

ISBN:9781337399395

Author:Pratt, David J.

Publisher:Pratt, David J.

Chapter11: Pricing Concrete Work

Section: Chapter Questions

Problem 9RQ: Calculate the cost per cubic yard to place concrete using each of the alternatives described. The...

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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 $290.
A cement grinding mill "A" with a capacity of 50 tons per hour employs P12,000 per tonforged steel grinding balls with a wear rate of 100 grams per ton of cement processed.Another cement mill of the same capacity, "B," utilizes P50,000 per ton high chromesteel grinding balls with a wear rate of 20 grams per ton of cement processed.Determine the more cost-effective grinding mill, keeping all other factors constant. do not use excel, use formula
A Highway contractor has four locations A, B, C, and D on a road contract to which crushed stone is to be delivered. The stone, which is all of the same quality is to be supplied from two quarries 1 and 2. The table below shows the relative transportation cost per cubic meter of transporting stone from each quarry to each site. Quarry 12 2 A 9 12 45 Location B с D Relative transportation costs ($ per m³) 15 10 8 105 Quantities required at each location (m³) 11 3 135 6 150 Quarry output (m³) 120 255 a) What is the optimal allocation of the crushed stone from each quarry to each location? b) What is the transportation cost corresponding to the solution obtained in part a?
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A cement grinding mill “A” with a capacity of 50 tons per hour utilizes forged steel grinding balls costing ₱ 12,000 per ton, which have a wear rate of 100 grams per ton cement milled. Another cement mill “B” of the same capacity uses high chrome steel grinding balls costing ₱ 50,000 per ton with wear rate of 20 grams per ton cement milled. Determine the more economical grinding mill, considering other factors to be the same.
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A company uses a milling machine that operates with crushing spheres has a capacity of 50 tons per hour and has an operation cost of P6000 per 500 kg and a wear rate of .05 kg per 500 kg of ground cement. They are offered another machine of the same capacity using high chrome steel crushing spheres with an operation cost of P50,000 per 1000 kg and a rate of wear equivalent to .02 kg per 1000 kg of ground cement. Assuming all other factors similar, should the company purchase a new machine or not? Show complete solution (1 ton = 1000 kg)