Estimating the Cost for the

spyfleaUrban and Civil

Nov 25, 2013 (3 years and 8 months ago)

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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


(yd
3
).

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 ft
3

to yd
3







ft ft.ft ft

3
16 18 333 96


3 3
(27 ft 1yd )
 
yd
ft. yd say 4.0 cu. yd
ft
3
3 3
3
1
96 3 55
27
Estimating the Cost of a Pad

Concrete is typically sold in increments of ½ yd
3


$98/ yard
3

x 4.0 yards
3

= $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. edge dist.

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. edge dist.

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