1. Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Estimating the Cost for the Concrete Pad
Concrete Estimating
Common Uses of Concrete
Reinforcing Bar
How Much Will the Concrete Cost?
Estimating the Cost of a Pad
Cost Estimate
Cost Estimator
Project Lead The Way, Inc.
Copyright 2010

2. Common Uses of Concrete
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Common Uses of Concrete
Foundations and footings
Driveways and sidewalks
Floors
Retaining walls
Piers
Columns
Project Lead The Way, Inc.
Copyright 2010

3. Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Reinforcing Bar
Concrete has high compression strength, yet poor tensile strength. Rebar is added to increase the tensile strength.
Project Lead The Way, Inc.
Copyright 2010

4. Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Reinforcing Bar
Rebar is also used to pin one structural element to an adjacent element.
Project Lead The Way, Inc.
Copyright 2010

5. How Much Will the Concrete Cost?
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
How Much Will the Concrete Cost?
Concrete is sold by volume and measured in cubic yards (yd3).
Project Lead The Way, Inc.
Copyright 2010

6. Estimating the Cost of a Pad
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Estimating the Cost of a Pad
Pad size = 16 ft x 18 ft floor
4 in. thick
Convert all units to ft
16 ft, 18 ft, .333 ft
Calculate volume (L x W x t)
Convert ft3 to yd3
Project Lead The Way, Inc.
Copyright 2010

7. Estimating the Cost of a Pad
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Estimating the Cost of a Pad
Concrete is typically sold in increments of 1yd3 $98/ yard3 x 4.0 yards3 = $392
Project Lead The Way, Inc.
Copyright 2010

8. Estimating the Cost of the Pad
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Estimating the Cost of the Pad
Rebar
Placed every two feet (max.) on a grid
Sold in 10 ft lengths
Must be lapped 6 in. to maintain strength
Maintain a 3 in. edge distance
6 in. lap
3 in. edge dist.
Project Lead The Way, Inc.
Copyright 2010

9. Estimating the Cost of the Pad
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Estimating the Cost of the Pad
Rebar
3 in. edge dist.
6 in. lap
[After the question is displayed, give students a chance to estimate the number of 10 ft pieces necessary. Then click to show the answer.]
You will need nineteen full 10 ft pieces, plus nine 10 ft bars from which you will cut the 8 ft pieces.
You will also need ft bars from which to cut the 6 ft pieces.
Order a total of 38 (= ) 10 ft pieces.
How many 10 ft pieces of rebar are needed? 38
Project Lead The Way, Inc.
Copyright 2010

10. Estimating the Cost of the Pad
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Estimating the Cost of the Pad
Rebar
Each piece of #4 rebar costs $4.78.
38 x $4.78 = $181.64
Other associated costs include material for forms, gravel, and labor.
Project Lead The Way, Inc.
Copyright 2010

11. Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Cost Estimate
A forecast of the cost of a future project
Prepared at different levels of a project
Conceptual Design
Construction Documents
Bid Phase
Includes
Quantity take-off − Subcontractor quotes
Material costs − Indirect costs
Labor rates and costs − Profit margin
Equipment costs
Completed with cost estimating software
The success of a building project depends heavily on accurate cost forecasting. Cost Estimates may be performed at several stages of the design and construction of a building project in an effort order to manage project costs.
[click] A very general cost estimate may be performed at the conceptual phase of design before design documents are completely developed in order to determine the feasibility of a project. That is, a general idea of the cost is needed to decide whether it is financially profitable to proceed with the design and construction of a project or to choose between alternate designs. This cost estimate is often based on historical cost per square foot data
[click] Once the construction documents are substantially complete (90% complete or more) a cost estimate may be performed to more precisely determine anticipated costs. This cost estimate is used to verify the conceptual cost estimate and identify cost overruns that have resulted from design modifications. Potential areas of cost savings can be identified at this point and design modifications made to reduce project costs. This estimate can also be used as a ball park estimate of the projected costs submitted by potential construction contractors in the bid phase.
[click] In the bid phase of a traditional construction project, each contractor interested in building the project submits a “bid” which, stated simplistically, is the cost he will charge to construct the project. At this point, the construction documents are 100% complete and each contractor completes a cost estimate to predict the cost of construction that he uses to “bid” on the project.
[click] A cost estimate will include many elements. We have only considered the cost of materials in this presentation, but a comprehensive cost estimate for a building project will include all of these items [see bullets].
Project Lead The Way, Inc.
Copyright 2010

12. Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Concrete Estimating
Common Uses of Concrete
Reinforcing Bar
How Much Will the Concrete Cost?
Estimating the Cost of a Pad
Cost Estimate
Cost Estimator
Project Lead The Way, Inc.
Copyright 2010