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
Project Lead The Way, Inc.
Copyright 2010

2. 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)
Concrete is typically sold in increments of ½ yd3
Example: $98/ yard3 x 4.0 yards3 = $392
Project Lead The Way, Inc.
Copyright 2010

3. Determine Footprint of Pad in yd3
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Determine Footprint of Pad in yd3
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
(1 ft = 12 in.)
Project Lead The Way, Inc.
Copyright 2010

4. Guidelines for Estimating Rebar Quantity
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Guidelines for Estimating Rebar Quantity
Placed every two feet (max.) on a grid
Sold in various 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

5. Example: Estimate how many 10 ft pieces of rebar are needed?
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Example: Estimate how many 10 ft pieces of rebar are needed?
6 in. lap
3 in. edge dist.
[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.
Project Lead The Way, Inc.
Copyright 2010

6. Answer: You will need to 38 10’ pieces of rebar
Estimating the Cost for the Concrete Pad
Civil Engineering and Architecture
Unit 2 – Lesson 2.2 – Cost and Efficiency Analysis
Answer: You will need to 38 10’ pieces of rebar
Breakdown:
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.
Project Lead The Way, Inc.
Copyright 2010

7. Estimating the Total 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 Total 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