6-13.
When a reinforcing bar is bent too
sharply, what might occur?
1.
The bar would crack or be
weakened
2.
The bar will not adhere to the
concrete
3.
Concrete strength would be
reduced
4.
Hydration would not occur
6-14.
When not dimensioned on the
drawings, what is the minimum length
of a lap splice for (a) No. 3 bars
and (b) No. 6 bars?
1.
(a) 11.25 in
(b) 22.50 in
2.
(a) 12.00 in (b) 22.50 in
3.
(a) 22.50 in (b) 12.00 in
4.
(a) 22.50 in (b) 11.25 in
6-15.
What pattern sizes are available in
6-16.
6-17.
square pattern welded-wire fabric?
1.
1 by 1 in, 2 by 2 in, and
3 by 3 in
2.
2 by 2 in, 3 by 3 in, 4 by 4 in,
and 5 by 5 in
3.
2 by 2 in, 3 by 3 in, 4 by 4 in,
and 6 by 6 in
4.
3 by 3 in, 5 by 5 in, and
6 by 6 in
When concrete structural members are
fabricated at locations other than
the final position of use, they are
known by what term?
1.
preconstructed
2.
Cast-in-place
3.
Prefabricated
4.
Precast
What term is concrete cast in its
final position of use known by?
1.
Preconstructed
2.
Cast-in-place
3.
Prefabricated
4.
Precast
IN ANSWERING QUESTIONS 6-18 THROUGH 6-21,
SELECT THE PRECAST STRUCTURAL MEMBER FROM
THE FOLLOWING LIST WHICH BEST FITS THE USE
DESCRIBED.
A.
FLOOR OR ROOF DECK
B.
DECK PANEL FOR A LARGE PIER
c.
INSULATED EXTERIOR WALL
6-18.
Tongue-and-groove panel.
1. A
2. B
3. C
6-19.
6-20.
6-21.
6-22.
6-23.
6-24.
6-25.
6-26.
Sandwich panel.
1. A
2. B
3. C
Double-T slab.
1. A
2. B
3. C
Channel slab.
1. A
2. B
3. C
What terms correctly refer to the
small,
closely spaced beams used in
(a) floor and (b) roof construction?
1.
(a) Joists (b) purlins
2.
(a) Joists
(b) joists
3.
(a) Purlins (b) purlins
4.
(a) Purlins (b) joists
What primary difference, if any,
exists between the beams and
girders?
1.
Beams are shorter than girders
2.
Beams are used for different
purposes than girders
3.
Beams are made of different
material than girders
4.
Nothing; they are the same
Unless the ends of beams are
rectangular, most of them will be of
what cross-sectional shape?
1.
Single T
2.
Double T
3. I
4. C
In hollow precast columns, what
material is put in the core to help
hold the column upright?
1.
Concrete
2.
Looped rod
3.
Grout
4.
Heavy cardboard
Of the following advantages of
precasting identical concrete
members,
which is considered to be
the most important?
1.
Less required storage space
2.
Faster erection time
3.
Reusable forms
4.
Quality-controlled concrete
38
