Construction Cost Estimating

Class #5 - Concrete

Prof. Ralph V. Locurcio, PE

CON 4003CVE 4073-5073

Overview

Forms Reinforcing Concrete Spread Footings Columns Foundation Walls Beams Slab Conclusion

Forms

May be bid by itemization

Based on square footage rather than linear

SFCA = square foot contact area

Quantity of form material & labor

Reinforcing

Rebar Welded wire fabric

Purchase Small amounts by lineal foot (20’) Large amounts by pound/ton

Fabricated Fabricated in the field, lengths of 20-60 ft Large jobs fabricated and shipped

Reinforcing Cont.

Rebar sizes

Concrete

Various types based specs & strength Type I = normal cement Type II = moderate-sulfate resistance cement Type III = high-early-strength cement Type IV = low-heat-of-hydration Type V = high-sulfate –resistance cement

Mixes Add-mixtures are included for certain physical

properties

Concrete Cont.

Costs Best place to get prices is from concrete

suppliers Bid by cubic yard Labor for placement and finishing (use RS

Means)

Placement From truck with chute Concrete bucket Concrete pump

Footings

Spread Footings Package includes:

footings, forms, horizontal rebar in the footings and the dowles

Continuous footings Similar to spread

footing but a much longer than they are wide

Example 5-1

Example 5-1 cont.

Figure 5-1

Footings & Columns

Example 5-1 cont.

Volume Calculation

Example 5-1 cont.

Linear Calculation

Concrete column as volumetric good

Example 5-2

Example 5-2 cont.

Figure 5-1

Example 5-2

Example 5-2 cont.

Example 5-2 cont.

Foundation Walls

Foundation Walls

Foundation Walls

Foundation Walls

Figure 5-15 Lengths of the Foundation Walls

Example 5-6 cont.

Homework Template

Conclusion

Lots of examples Any questions?