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

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Module 27108-06 Introduction to Concrete Test
Review
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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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2. What is cement dermatitis (Page 8.2, Section
2.1.0 Warning Box)?
Answer
Allergenic skin reaction to cement exposure?
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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
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4. What advantage does roller-compacted concrete
offer (Page 8.6, Section 4.0.0)?
Answer
Stiff mixture, concreting large areas, requires
no form
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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.
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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
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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.
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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
? R2 H / 27 cu.ft. (per cubic yard)
3.14 12 8 27 cu.ft.
25.12 cu.ft. 27 cu.ft.
.9303 cu. yd. rounded up to 1 cubic yard.
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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
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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
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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
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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)
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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.
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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
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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
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16. What type of footing is used to support
posts, columns, and similar structures (Page
8.20, Section 9.2.2)?
Answer
Pier footings
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17. What is the name of the groove that is shaped
into a continuous footing (Page 8.22, Section
9.2.3)?
Answer
Keyway
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18. The letter A in the figure is pointing to
(Page 8.23, Section 9.2.3 Figure 15).
Answer
Spreader
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19. The letter D in the figure is pointing to
(Page 8.23, Section 9.2.3 Figure 15).
Answer
Brace
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20. The letter A in the figure is pointing to
(Page 8.23, Section 9.2.3 Figure 15).
Answer
Rebars or Rerods
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21. The letter B in the figure is pointing to
(Page 8.23, Section 9.2.3 Figure 15).
Answer
Keyway
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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.
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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
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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
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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
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26. What type of form is built for pouring
sidewalks (Page 8.28, Section 9.4.3)?
Answer
Edge Form
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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
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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
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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
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End of Presentation