Transcript 2-Class #5
Construction Cost Estimating
Class #5 - Concrete
Prof. Ralph V. Locurcio, PE
Forms
Reinforcing
Concrete
Spread Footings
Columns
Foundation Walls
Beams
Slab
Conclusion
May be bid by itemization
Based on square footage rather than linear
SFCA = square foot contact area
Quantity of form material & labor
Rebar
Purchase
Welded wire fabric
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
Rebar sizes
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
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
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
Figure 5-1
Volume Calculation
Linear Calculation
Concrete column as volumetric good
Figure 5-1
Lots of examples
Any questions?