LESSON 2
PRACTICE EXERCISE
ANSWER KEY AND FEEDBACK
Item
Correct Answer and Feedback
1.
Freezing expected but concrete not continually exposed to moisture or free water for long periods
before freezing.
Moderate exposure. This means ... (page 2-5)
2.
Hardened concrete.
Always remember that a change ... (page 2-2)
3.
Combine the paste components as in the Trial Batch Method.
Determine and produce the required slump.
Estimate the water requirement (see Table 2-2 on page 2-4).
Estimate the volume of dry-rodded coarse aggregate per cubic yard (see Table 2-6 on page 2-14).
Determine the maximum size and FM of the fine aggregate.
Calculate the volume occupied per cubic yard of concrete by the water, cement, coarse aggregate,
and air.
(6/11 guidelines are presented.)
This method can be ... (page 2-13)
4.
Concrete exposed to deicing chemicals or other aggregate agent or continually exposed moisture or
water prior to freezing.
Severe exposure. This means ... (page 2-5)
5.
Determine the total volume in cubic yards of the concrete to be placed.
Add an extra amount for waste.
Determine the total amounts of cement, fine and coarse aggregate by multiplying amounts of these
components needed for 1 cubic yard the adjusted total volume.
Determine the required amount of water needed for the job. (Amount of water is approximately 8
gallons of water per sack of cement needed.)
Step 1, Step 2, and Step 3 (pages 2-21 and 2-23)
6.
Proportions are determined by the concrete's end use.
Proportions are determined by anticipated conditions at the time of placement.
Strength, durability, and appearance.
Placability and economy.
Concrete proportions for a... (page 2-2)
EN5466
2-34
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