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Module 27108-06 Introduction to Concrete Test Review

Module 27108-06 Introduction to Concrete Test Review. 1. What is the characteristic of green concrete that gave it its name (Page 8.2, Section 2.0.0)?. Answer. Hardened concrete that has not reached structural strength (can be easily damaged).

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Module 27108-06 Introduction to Concrete Test Review

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  1. Module 27108-06 Introduction to Concrete Test Review

  2. 1. What is the characteristic of green concrete that gave it its name (Page 8.2, Section 2.0.0)? Answer Hardened concrete that has not reached structural strength (can be easily damaged)

  3. 2. What is cement dermatitis (Page 8.2, Section 2.1.0 Warning Box)? Answer Allergenic skin reaction to cement exposure?

  4. 3. What is pozzolan (Page 8.5, Section 3.0.0)? Answer Latin derivation, includes items such as fly ash, silica fume, or blast furnace slag

  5. 4. What advantage does roller-compacted concrete offer (Page 8.6, Section 4.0.0)? Answer Stiff mixture, concreting large areas, requires no form

  6. 5. What is hydration (Page 8.8, Section 5.0.0)? Answer Cement-water reaction whereby concrete gains its greatest strength if it does not loose moisture too quickly.

  7. 6. What can be used in cold weather to prevent concrete freezing during the curing process (Page 8.8, Section 5.0.0)? Answer Insulating blankets, fiberglass batts, or expanded plastic cell slabs

  8. 7. How much concrete would it take to fill a sidewalk portion that measured 80’ long 3’ wide and 4” thick (Page 8.10, Section 7.1.1)? Answer L X W X T (In parts of a foot) / 27 cu.ft. (per cu. Yard) 80’ X 3’ X .3’ 27’ cu.ft. per cu. yard 72 cu. ft. 27’ cu.ft. 2.667 cubic yards or to 2 and 2/3 cubic yards.

  9. 8. How much concrete would be needed to fill a columnar form that was 8’ high and 2’ in diameter (Page 8.12, Section 7.2.1)? Answer Π * R2 *H / 27 cu.ft. (per cubic yard) 3.14 * 1’2 *8’ 27 cu.ft. 25.12 cu.ft. 27 cu.ft. .9303 cu. yd. rounded up to 1 cubic yard.

  10. 9. What is positioned within concrete to increase its strength and resistance to cracking (Page 8.12, Section 8.1.0)? Answer Rebars or rerods

  11. 10. What is the purpose of the deformed surface on some reinforcement steel (Page 8.13, Section 8.1.0)? Answer Improves bond in concrete & prevents rod from moving

  12. 11. One of the materials used in concrete work is referred to as WWF which stands for______________ (Page 8.16, Section 8.4.0). Answer Welded-Wire Fabric

  13. 12. What does OSHA require be done to all protruding reinforcement steel during the form construction process (Page 8.16, Section 8.4.0 Inside track)? Answer Must be guarded Per O.S.H.A. Standard 29 CFR 1926.701(b)

  14. 13. Why is it important for the purpose of concrete forming to know where the frost line is located (Page 8.19, Section 9.2.0)? Answer Frost heave – frozen water expands causing damage to structure with footings that are above frost line.

  15. 14. What type of footing is commonly used to support poured concrete or concrete block walls (Page 8.20, Section 9.2.2)? Answer Continuous Footing

  16. 15. What is done to put concrete footings on hilly or steeply sloped land (Page 8.20, Section 9.2.2)? Answer Stepped footing & foundation wall

  17. 16. What type of footing is used to support posts, columns, and similar structures (Page 8.20, Section 9.2.2)? Answer Pier footings

  18. 17. What is the name of the groove that is shaped into a continuous footing (Page 8.22, Section 9.2.3)? Answer Keyway

  19. 18. The letter A in the figure is pointing to… (Page 8.23, Section 9.2.3 Figure 15). Answer Spreader

  20. 19. The letter D in the figure is pointing to… (Page 8.23, Section 9.2.3 Figure 15). Answer Brace

  21. 20. The letter A in the figure is pointing to… (Page 8.23, Section 9.2.3 Figure 15). Answer Rebars or Rerods

  22. 21. The letter B in the figure is pointing to … (Page 8.23, Section 9.2.3 Figure 15). Answer Keyway

  23. 22. On a concrete form, where is a waler found (Page 8.22, Section 9.2.3)? Answer Horizontal members across the form used to support studs.

  24. 23. What is the name of the upright member used on a concrete form to stiffen it (Page 8.25, Section 9.3.1)? Answer Strongback

  25. 24. What is the purpose of form sheathing on a concrete form (Page 8.25, Section 9.3.1)? Answer Gives wall surface its shape and keeps the wet concrete in place

  26. 25. Describe the characteristics of plyform that make it attractive for use in constructing concrete forms (Page 8.25, Section 9.3.1). Answer Exterior plywood, sanded both surfaces, Oil impregnated to improve release from cured concrete

  27. 26. What type of form is built for pouring sidewalks (Page 8.28, Section 9.4.3)? Answer Edge Form

  28. 27. The form part shown by the arrow from letter B in the figure is …. (Page 8.30, Section 9.4.3 Figure 22)? Answer Scab

  29. 28. The form part shown by the arrow from letter C in the figure is …. (Page 8.30, Section 9.4.3 Figure 22)? Answer Duplex nail

  30. 29. When can forms that were used to pour floor slabs be safely removed (Page 8.31, Section 9.5.0)? Answer Time of removal should be determined by a structural engineer

  31. End of Presentation

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