A S S I G N M E N T 4
Textbook Assignment: "Mix Design: Concrete and asphalt." Pages 17-1 through 17-22. "Soil
Stabilization." Pages 18-1 through 18-9.
Learning Objective: Identify the
methods and procedures used in the
design of concrete mixtures.
4-1.
Concrete mixture proportions are
determined by which of the fol-
lowing factors?
1.
Anticipated weather conditions
at the time of placement
2.
Anticipated weather conditions
during the entire curing
process
3.
Size and shape of the structure
4.
Quantity to be placed
4-2.
What factor determines the strenqth
and durability of the concrete? -
1. Volume of water
2. Volume of cement
3. Water-cement ratio
4. Compressive strength
4-3.
When considering the exposure
conditions and strength require-
ments using tables 17-1 and 17-2,
what water-cement ratio should you
use?
1.
Higher ratio
2.
Lower ratio
3.
Average of the appropriate
ratios
4.
Laboratory obtained ratio
4-4.
A concrete wall is 10 inches thick.
What is the maximum size of the
coarse aggregate that can be used
in the mix?
1.
2.0 in
2.
3.5 in
3.
5.0 in
4.
7.5 in
4-5.
Fine aggregate is used in a mix for
which of the following purposes?
1.
To increase the strength of the
mix
2.
To absorb excess water
3.
To increase the workability of
the mix
4.
To accelerate the hydration
process
4-6.
Regardless of weather conditions,
entrained air should always be used
in concrete for which of the
following purposes?
1.
Precast
2.
Paving
3.
Drainage
4.
Foundation
4-7.
Concrete that is exposed to
4-8.
4-9.
4-10.
4-11.
moisture or free water before
freezing is classified as what
type of exposure?
1.
Mild
2.
Moderate
3.
Severe
4.
Harsh
What method measures the
consistency of the concrete mix?
1.
Trial batch
2.
Workability test
3.
Proportions and ratio
4.
Slump test
The size of your trial batch should
be determined by which of the fol-
lowing factors?
1. Size of the placement
2. Equipment available for
placement
3. Number of test samples required
4. Size of the coarse aggregate
The aggregates for your test batch
should be in what condition?
1.
Oven-dried
2.
Saturated, surface-dry
3.
Saturated
4.
Super saturated
To determine the amount of mixing
water needed for a trial batch, you
must determine which of the
following information?
1.
Amount of cement required
2.
Water-cement ratio
3.
Desired slump
4.
All of the above
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