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

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

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

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

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 10-10 ft bars from which to cut the 6 ft pieces. Order a total of 38 (= 19+9+10) 10 ft pieces. Project Lead The Way, Inc. Copyright 2010

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 10-10 ft bars from which to cut the 6 ft pieces. Order a total of 38 (= 19+9+10) 10 ft pieces. Project Lead The Way, Inc. Copyright 2010

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