4-12.
Your coarse aggregate has a maximum
size of 2 inches and a fineness
modulus of 3.00. What quantity of
coarse aggregate is required for a
1-cubic-yard trial batch?
1.
1,944 lb
2.
2,000 lb
3.
19.44 cu ft
4.
20.00 cu ft
4-13.
You are preparing a l-cubic-foot
trial batch with a water-cement
ratio of 0.50. The quantity of
cement to be used is 23.5 pounds.
What is the required quantity of
water?
1.
23.50 lb
2.
11.75 lb
3.
0.50 cu ft
4.
0.25 cU ft
4-14.
You mix a 1-cubic-yard trial batch
and the slump is 2 inches more than
the desired slump. What action
must you take?
1.
Add 10 gal of water
2.
Decrease your water by 10 lb
3.
Decrease your water by 20 lb
4.
Add more cement
4-15.
To determine the absolute volume of
coarse aggregate, which of the
following information do you
require?
1.
Maximum aggregate size
2.
Specific gravity
3.
Dry-rodded weight
4.
All of the above
4-16.
When the fineness modulus is not in
the tables, what must you do to
determine the volume for the coarse
aggregate?
1.
Use the value that is higher
than the aggregate
2.
Use the value that is lower
than the aggregate
3.
Use the average value from the
tables
4.
Interpolate to obtain the value
4-17.
How do you determine the absolute
volume of fine aggregate?
1.
(Percents of fine aggregate) x
(total cement)
2.
27 - (Total absolute volume of
all other materials)
3.
(Absolute volume of coarse
aggregatea)-(absolute volume
of concrete)
4.
(Total volume of all material)
x (specific gravity of fines) x
62.4
4-18.
4-19.
4-20.
4-21.
4-22.
4-23.
What is the percentage of
free-surface moisture in sand that
is squeezed and clings together but
contains no excess water?
1.
0% to 2%
2.
2% to 4%
3.
5% to 8%
4.
8% to 12%
What is the maximum FSM of gravel?
1.
1%
2.
2%
3.
3%
4.
4%
When you are batching the concrete
mix by weight, how do you account
for the weight contributed by the
FSM?
1.
Increase the total weight for
the coarse aggregate only by
the FSM
2.
Decrease the total weight for
the fine aggregate only by the
FSM
3.
Increase the total weight for
the aggregates per cubic yard
by the FSM
4.
Decrease the total weight for
the aggregates by the FSM
What adjustment, if any, should be
made to water requirements to
account for FSM of the aggregates?
1.
Increase the amount of water by
the FSM
2.
Decrease the amount of water by
the FSM
3.
Decrease the amount of water by
the FSM of the fine aggregates
only
4.
None
The FA has a 4 percent FSM and the
CA has a 2 percent FSM.
The
original mix design called for the
FA to be 1,050 pounds per cubic
yard. What is the adjusted weight
of the FA for the actual concrete
mix?
1.
1,008 lb/cu yd
2.
1,050 lb/cu yd
3.
1,092 lb/cu yd
4.
1,113 lb/cu yd
You should monitor the moisture
content of the aggregates and make
appropriate adjustments under which
of the following conditions?
1.
After periods of dryness
2.
After rains
3.
After new material is delivered
4.
All of the above
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