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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
Common Uses of Concrete
• Foundations and footings
• Driveways and sidewalks
• Floors
• Retaining walls
• Piers
• Columns
Reinforcing Bar
Concrete has high compression strength, yet poor tensile strength. Rebar is added to increase the tensile strength.
Reinforcing Bar
Rebar is also used to pin one structural element to an adjacent element.
How Much Will the Concrete Cost?
Concrete is sold by volume and measured in cubic yards (yd3).
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
ft ft . ft ft 316 18 333 96
3 3( 27 ft 1yd )
yd
ft . yd say 4.0 cu. yd ft
33 3
3
196 3 55
27
Estimating the Cost of a Pad
Concrete is typically sold in increments of ½ yd3
$98/ yard3 x 4.0 yards3 = $392
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
. ed
ge d
ist.
Estimating the Cost of the Pad
Rebar
(19) 10 ft bars
How many 10 ft pieces of rebar are needed?
(9) 8 ft bars
(10) 6 ft bars
38
3 in
. ed
ge d
ist.
6 in. lap
Estimating the Cost of the Pad
Rebar• Each piece of #4 rebar
costs $4.78.38 x $4.78 = $181.64
Concrete $392.00
Rebar +$181.64
Total $573.64
Other associated costs include material for forms, gravel, and labor.
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
Cost Estimator• Specialize in developing cost information for
building projects• Most employed in construction industry• Most have gained experience through working in
building construction industry• Employed by
– Owner– Project manager– Construction Contractor– Design professional
• May be discipline specific (electrical, structural, etc.)
Concrete Estimating
• Common Uses of Concrete
• Reinforcing Bar
• How Much Will the Concrete Cost?
• Estimating the Cost of a Pad
• Cost Estimate
• Cost Estimator
Image Resources
Microsoft, Inc. (n.d.). Clip art. Retrieved March 18, 2009, from http://office.microsoft.com/en-us/clipart/default.aspx