Transcript 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.

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)
2. What is cement dermatitis (Page 8.2, Section 2.1.0
Warning Box)?
Answer
Allergenic skin reaction to cement exposure?
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
4. What advantage does roller-compacted concrete offer
(Page 8.6, Section 4.0.0)?
Answer
Stiff mixture, concreting large areas, requires no
form
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.
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
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.
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.
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
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
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
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)
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.
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
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
16. What type of footing is used to support posts, columns,
and similar structures (Page 8.20, Section 9.2.2)?
Answer
Pier footings
17. What is the name of the groove that is shaped into a
continuous footing (Page 8.22, Section 9.2.3)?
Answer
Keyway
18. The letter A in the figure is pointing to… (Page 8.23,
Section 9.2.3 Figure 15).
A
B
C
D
Answer
Spreader
E
19. The letter D in the figure is pointing to… (Page 8.23,
Section 9.2.3 Figure 15).
A
B
C
D
Answer
Brace
E
20. The letter A in the figure is pointing to… (Page 8.23,
Section 9.2.3 Figure 15).
A
B
C
Answer
Rebars or Rerods
21. The letter B in the figure is pointing to … (Page 8.23,
Section 9.2.3 Figure 15).
A
B
C
Answer
Keyway
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.
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
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
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
26. What type of form is built for pouring sidewalks (Page
8.28, Section 9.4.3)?
Answer
Edge Form
27. The form part shown by the arrow from letter B in the
figure is …. (Page 8.30, Section 9.4.3 Figure 22)?
A
G
B
D
E
C
F
Answer
Scab
28. The form part shown by the arrow from letter C in the
figure is …. (Page 8.30, Section 9.4.3 Figure 22)?
A
G
B
D
E
C
Answer
Duplex nail
F
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
End of
Presentation