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?
