# Estimating the Cost for the

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25 Νοε 2013 (πριν από 4 χρόνια και 5 μήνες)

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Estimating the Cost for the

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

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