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  Welded wire fabric  Purchase  Small amounts by lineal foot (20’)  Large amounts by pound/ton  Fabricated  Fabricated in the field, lengths of 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?