Estimating in Building Construction

(g) Strip from form and stockpiling to finish curing.

(h)Erect the concrete on the job. If poured off the site,

it will also be necessary to load the precast concrete

on trucks, transport it to the job site, unload it, and

then erect it.

6. Equipment required may include mixers, lift trucks, and
   cranes. Special equipment is required to prestress concrete.
   Equipment to cure the concrete may be required, and mis-
   cellaneous equipment such as hoes, shovels, wheelbar-
   rows, hammers, and vibrators will also be required.


7. Shop drawings should be prepared either by a company
   draftsman or by a consultant.

10–20 Precast Checklist

Shapes Girders

Bearing requirements Lintels

Accessories Strength requirements

Walls Inserts

Floors Attachment requirements

Ceilings Finish

Beams Color

Joists Special requirements

118 CHAPTER TEN

Web Resources

http://www.concrete.org

http://www.concretenetwork.com

products.construction.com

http://www.worldofconcrete.com

http://www.4specs.com

http://www.tilt-up.org

http://www.precast.org

http://www.crsi.org

http://www.pci.org

Review Questions

1. What is the difference between plant ready-mixed con-
   crete and job-mixed concrete?


2. Under what circumstances might it be desirable to have
   a field batching plant for job-mixed concrete?


3. What is the unit of measure for concrete?


4. Why does the estimator have to keep the different places
   that the concrete will be used separate in the estimate
   (e.g., concrete sidewalks, floor slabs)?


5. Why should the different strengths of concrete be kept
   separate?


6. Where would the estimator most likely find the strength
   of the concrete required?


7. How is rebar taken off? In what unit of measure are
   large quantities ordered?


8. How does lap affect the rebar quantities?


9. How is wire mesh taken off? How is it ordered?
   10. How is vapor barrier taken off? How does the estimator
   determine the number of rolls required?
   11. What unit of measure is used when taking off expansion
   joint fillers?
   12. What unit of measure is used when taking off concrete
   finishes?
   13. Why should each finish be listed separately on the
   estimate?
   14. Where would the estimator look to determine if any
   curing of concrete is required on the project?
   15. Why must the estimator consider how the concrete will
   be transported to the job site?
   16. What unit of measure is used when taking off concrete
   forms? How can reuse of forms affect the estimate?
   17. What unit of measure is used for form liners? When might
   it be more economical to rent instead of purchasing them?
   18. What two methods of pricing might a subcontractor use
   for precast concrete?
   19. Many suppliers take the responsibility of installing the
   precast units. Why might this be desirable?
   20. Under what conditions might it be desirable for a con-
   tractor to precast the concrete on the job site?
   21. Determine the amount of concrete, reinforcing, forms,
   and accessories required for the building in Appendix C.
   22. Using the drawings of Billy’s Convenience Store found
   in Appendix F, determine the quantity of concrete and
   reinforcing required for the spread footings.
   23. Using the drawings of Billy’s Convenience Store found
   in Appendix F, determine the quantity of concrete, rein-
   forcing, and formwork in the slab on grade.