Reinforced Concrete Test 2
This test takes 1 hour to complete.
- 1.
Cylinders being transported to the lab should be _______.
- A.
Cushioned
- B.
Upright and braced
- C.
Horizontal and stacked
- D.
60 – 80
Correct Answer
A. CushionedExplanation
ASTM C31, 11.1Rate this question:
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- 2.
When rodding the final layer, the rod should penetrate.
- A.
1 inch into the first layer
- B.
1 inch into the second layer
- C.
4 inches
- D.
2 inches
Correct Answer
B. 1 inch into the second layerExplanation
ASTM C31, 9.4.1Rate this question:
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- 3.
Steel for welded reinforcing is best described by ASTM ________.
- A.
A615
- B.
A128
- C.
A480
- D.
A706
Correct Answer
D. A706Explanation
ASTM A706, 1.1Rate this question:
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- 4.
When approved by the building official; water may be present at the place of deposit when ________.
- A.
The concrete is 5000 psi
- B.
Footings are being poured in the rain
- C.
A tremie is used
- D.
The concrete is type III with minimum F’c of 2500 psi
Correct Answer
C. A tremie is usedExplanation
PG. 69, 5.7.1(f)Rate this question:
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- 5.
Precautions for cold weather concrete should be followed when the mean daily temperature falls to ______degrees Fahrenheit.
- A.
32
- B.
40
- C.
45
- D.
50
Correct Answer
B. 40Explanation
ACI 306Rate this question:
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- 6.
The upper most bar rank indicates ______.
- A.
Mill
- B.
Grade
- C.
Steel type
- D.
Size
Correct Answer
A. MillExplanation
ASTM A615 20.3.1Rate this question:
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- 7.
Concrete samples may only be rodded when the slump is greater than ______ inches.
- A.
4
- B.
2
- C.
3
- D.
1
Correct Answer
D. 1Explanation
ASTM Table 2Rate this question:
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- 8.
For six inch cylinders ______ layers should be rodded ______ times each.
- A.
4, 50
- B.
2, 25
- C.
3, 25
- D.
2, 20
Correct Answer
C. 3, 25Explanation
ASTM C31 Table 3Rate this question:
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- 9.
When assembling rebar, crossing bars should not be _______.
- A.
Welded
- B.
Held with plastic clips
- C.
Galvanized tie wire
- D.
Stainless steel tie wire
Correct Answer
A. WeldedExplanation
PG. 82, 7.5.4Rate this question:
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- 10.
Final curing temperature for cylinders is ____ degrees Fahrenheit.
- A.
70 - 75
- B.
73 +/- 6
- C.
73 +/- 3
- D.
60 – 80
Correct Answer
C. 73 +/- 3Explanation
ASTM C31, 10.1.3.1Rate this question:
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- 11.
The tolerance on a specified 3 inch slump when the project specifications are not written as “maximum” or “not to exceed” requirement is _______ inch(es).
- A.
+/- 1/2
- B.
+/- 1
- C.
+/- 1 1/2
- D.
+/- 2 1/2
Correct Answer
B. +/- 1Explanation
ASTM C94, 7.1.2Rate this question:
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- 12.
What is the minimum cover (in inches) for reinforcement in concrete cast against and permanently exposed to earth?
- A.
2
- B.
3
- C.
1
- D.
1/2
Correct Answer
B. 3Explanation
PG. 83, 7.7.1(a)Rate this question:
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- 13.
Initial curing temperature for cylinders is ____ degrees Fahrenheit.
- A.
Between 60 and 80
- B.
50 - 90
- C.
70 - 90
- D.
70 – 76
Correct Answer
A. Between 60 and 80Explanation
ASTM C31, 10.1.2Rate this question:
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- 14.
During a 400 yard placement, ______ samples for strength tests are required.
- A.
2
- B.
3
- C.
4
- D.
8
Correct Answer
B. 3Explanation
PG. 65, 5.6.2.1Rate this question:
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- 15.
The concrete should be sampled after ________.
- A.
All water has been added (adjustment water)
- B.
Within 1 hour of the addition of water to the batch
- C.
Within 300 drum revolutions on the mixer
- D.
Within 30 minutes of arrival at site
Correct Answer
A. All water has been added (adjustment water)Explanation
The concrete should be sampled after all water has been added (adjustment water) because this ensures that the water-cement ratio is accurate and consistent. Sampling the concrete before all the water has been added may result in an incorrect ratio, leading to poor quality concrete. Additionally, sampling within 1 hour of water addition ensures that the concrete is still fresh and workable. Sampling within 300 drum revolutions on the mixer or within 30 minutes of arrival at the site may not guarantee that all the water has been properly mixed and distributed throughout the concrete mixture.Rate this question:
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- 16.
Concrete represented by cores is acceptable if the average of three cores is _____ percent of F’c and no core falls below ______ percent of F’c.
- A.
90, 80
- B.
100, 85
- C.
100, 75
- D.
85, 75
Correct Answer
D. 85, 75Explanation
PG. 68, 5.6.5.4Rate this question:
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- 17.
Strength tests of field cured cylinders do not _____.
- A.
Indicate deficiencies in protection and curing
- B.
Form the basis for acceptance or rejection of F’c
- C.
Allow for guidance for shoring and reshoring
- D.
Determine removal times for forms
Correct Answer
C. Allow for guidance for shoring and reshoringExplanation
Strength tests of field cured cylinders do not allow for guidance for shoring and reshoring. This means that these tests cannot provide information or recommendations on the appropriate methods or timing for supporting or removing the forms used in construction. Instead, they primarily focus on assessing the strength of the concrete after it has cured in the field. The tests help to determine if the concrete meets the required strength criteria for acceptance or rejection, as well as identify any deficiencies in protection and curing.Rate this question:
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- 18.
According to the building code, the minimum depth of footings (except category R-3) is ________ inches.
- A.
6
- B.
8
- C.
10
- D.
12
Correct Answer
D. 12Explanation
IBC 1805.2Rate this question:
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- 19.
Concrete shall be thoroughly consolidated by ______.
- A.
Internal vibration
- B.
External vibration
- C.
Suitable means
- D.
When reinforcement spacing exceeds 6db
Correct Answer
C. Suitable meansExplanation
PG. 70, 5.10.8Rate this question:
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- 20.
Seismic hooks with a 135 degree bend require a minimum extension of _____db but not less than _____ inches.
- A.
12, 2
- B.
6, 3
- C.
8, 3
- D.
6, 2
Correct Answer
B. 6, 3Explanation
PG. 79, 7.1.3(c), PG. 306Rate this question:
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- 21.
For bundled bars, minimum concrete cover shall be equal to the equivalent diameter of the bundle, but need not be greater than ____ in.; except for concrete cast against and permanently exposed to earth, where minimum cover shall be 3 inches.
- A.
2
- B.
1
- C.
3/4
- D.
3
Correct Answer
A. 2Explanation
PG. 85, 7.7.4Rate this question:
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- 22.
Partially embedded reinforcement may be field bent when _______.
- A.
Preheating is used
- B.
Necessary for adjacent work
- C.
Shown on design drawings
- D.
Minimum bend diameters are maintained
Correct Answer
C. Shown on design drawingsExplanation
PG. 80, 7.3.2Rate this question:
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- 23.
In hot weather consideration of _______ is least important.
- A.
Schedule
- B.
Application of curing compound
- C.
Fog sprayers and wind curtains
- D.
Wetting the coarse aggregate stockpile
Correct Answer
D. Wetting the coarse aggregate stockpileExplanation
In hot weather, wetting the coarse aggregate stockpile is least important because hot weather conditions already provide enough heat for the aggregate to dry quickly. Wetting the coarse aggregate stockpile is typically done to prevent excessive evaporation and to maintain the desired moisture content in the concrete mixture. However, in hot weather, the heat can cause the water to evaporate rapidly, making it less effective to wet the coarse aggregate stockpile. Therefore, in hot weather, other considerations such as scheduling, application of curing compound, and the use of fog sprayers and wind curtains become more important to ensure proper curing and prevent premature drying of the concrete.Rate this question:
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- 24.
At footings, the splice between a #14 bar and a #18 bar in compression should be _______.
- A.
Not allowed
- B.
Lap splice
- C.
Mechanical connection
- D.
Welded
Correct Answer
B. Lap spliceExplanation
PG. 248, 15.8.2.3Rate this question:
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- 25.
What is the minimum cover (in inches) for primary reinforcement in a concrete beam not exposed to weather or in contact with the ground?
- A.
1 ½
- B.
2
- C.
1
- D.
3/4
Correct Answer
A. 1 ½Explanation
PG. 84, 7.7.1(c)Rate this question:
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- 26.
A strength test shall be the average of ______ tests.
- A.
4
- B.
3
- C.
2
- D.
6
Correct Answer
C. 2Explanation
PG. 65, 5.6.2.4Rate this question:
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Mar 21, 2023Quiz Edited by
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Sep 21, 2009Quiz Created by
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