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ACI - Field Testing Technician - Grade 1 > ASTM C31/C31M - Standard Practice for Making and Curing Concrete Test Specimens in the Field > Flashcards

ASTM C31/C31M - Standard Practice for Making and Curing Concrete Test Specimens in the Field Flashcards

1
Q

Practice C31/C31M gives standardized requirements for ______, ______, __________, and __________ for the test specimens.

A

Making
Curing
Protecting
Transporting

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2
Q

What diameter tamping rod is used if the diameter of the test cylinders or width of beam is:

less than 6 inches = ______
6” or greater = ______

A

3/8” (less than 6”)

5/8” (6” or greater)

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3
Q

Minimum frequency of an internal vibrator used in this procedure is:

A

9,000 vibrations/minute

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4
Q

The sampling receptacle shall be:

one of three things

A

Heavy gauge metal Pan
Wheelbarrow
Flat, clean non-absorbent board

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5
Q

Cylindrical specimens diameter shall be at least ___ times the nominal maximum size of the coarse aggregate?

A

3 times

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6
Q

Maximum aggregate size for a 4”x8” cylinder mold is __?

Maximum aggregate size for a 6”x12” cylinder mold is __?

A

1.25 inches for 4” x 8” cylinder mold

2 inches for a 6” x 12” cylinder mold

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7
Q

The sample of concrete used in molding test specimens must be obtained in accordance with what ASTM practice?

A

C172

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8
Q

When strength specimens are to be made, what three other tests must be made?

A

Air content
Slump
Temperature

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9
Q

The supporting surface on which specimens are stored shall be level within ___ per foot?

A

1/4” per foot

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10
Q

Number of vibrator insertions for a 4” diameter cylinder mold is?

A

1

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11
Q

Number of vibrator insertions for a 6” diameter cylinder mold is?

A

2

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12
Q

Number of vibrator insertions for a 9” diameter cylinder mold is?

A

4

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13
Q

When Vibrating, how many layers of concrete are required for a beam mold between 4” and 8” wide?

A

1

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14
Q

When vibrating beams under 6” wide, insert the vibrator at internals not exceeding ____ inches along the _______ of the long dimension of the specimen.
For specimens wider than 6”, use alternating insertions along _____ lines?

A

6 inches
Centerline
2 lines

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15
Q

When rodding a beam, how do you determine how many roddings are required per layer?

A

1 insertion for every 2 square inches of the top surface area of the beam
[ (L x W) /2 ]

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16
Q

When vibrating beams, after each layer has been vibrated, tap the side of the mold sharply at least ____ times with the mallet to close holes left by vibrating and to release entrapped air voids.

A

10 times

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17
Q

When vibrating, how many equal layers of concrete are required for cylinder mold (4”, 6” or 9” diameters)

A

2 layers

18
Q

When rodding, how many equal layers of concrete are required for the following cylinder molds:
4” diameter?
6” diameter?
9” diameter?
How many roddings for each layer of each mold?

A

4” diameter mold - 2 layers, 25 roddings per layer
6” diameter mold - 3 layers, 25 roddings per layer
9” diameter mold - 4 layers, 50 roddings per layer

19
Q

When rodding a beam mold, how many equal layers of concrete of:
beams between 4” and 8” wide?
beams over 8” wide?

A

2 layers for beams between 4” and 8” wide

3 layers or more for beams greater than 8” (not to exceed 6”)

20
Q

For concrete with a slump less than 1”, consolidation much be done by what method?

A

Vibrator

21
Q

For concrete with a slump between 1” and 3”, consolidation must be done by what method?

A

Vibrator or rodding

22
Q

For concrete with a slump of over 3”, consolidation must be done by what method?

A

Rodding

23
Q

Concrete mixtures with specified strengths of 6000 psi or greater, maintain the initial curing temperature between ___* to ___*F

A

68* to 78*F

24
Q

For concrete mixtures with a specified strength less than 6000 psi, maintain the initial curing temperature between ___* to ___*F

A

60* to 80*F

25
Q

Generally, no more than ___ seconds of vibration should be required for each insertion to adequately consolidate concrete w/ slump greater than 3”.
Longer if less than 3”

A

5 seconds

26
Q

Initial curing - Store standard-cured specimens for a period up to ___ hours after molding to maintain the specified temperature and moisture conditions.

A

48 hours

27
Q

Shield specimens from direct exposure to ____ and, if used, radiant heating devices.

A

Sunlight

28
Q

Record the minimum and maximum _________ achieved for each set of specimens during the initial curing period.

A

Temperatures

29
Q

Store the specimens in an environment that controls the loss of ________?

A

Moisture

30
Q

If the specimens are made and STANDARD CURED, the resulting strength test data when the specimens are tested are able to be used for the following purposes.
(check all that apply)

a - Determination of whether a structure is capable of being put in service

b - Quality Control

c - Form or shoring removal time requirements.

d - Acceptance testing for specified strength

e - Checking adequacy of mixture proportions for strength.

A

d - Acceptance for strength

e - Adequacy of mixture proportions for strength.

b - Quality Control

31
Q

If specimens are made and FIELD CURED, the resulting strength test data when the specimens are tested are able to be used for the following purposes.
(check all that apply)

a - Determination of whether a structure is capable of being put in service

b - Quality Control

c - Form or shoring removal time requirements.

d - Adequacy of curing and protection of concrete in the structure

e - Acceptance testing for specified strength

f - Comparison with test results for standard cured specimens or with test results from various in-place test methods

A

a - Is structure capable of being put in service

f - Comparison to standard cured test results

d - Adequacy of curing and protection of concrete in the structure

c - Form or shoring removal time requirements.

32
Q

Cylinders that are _____ cured, are stored in or near the structure and protected same as the structure.

A

field

33
Q

The diameter of a round vibrator shall be no more than __/__ the diameter of the cylinder mold or __/__ the width of the beam mold.

A

1/4 & 1/4

34
Q

The combined length of the vibrator shaft + vibrating element shall exceed the depth of the section being vibrated by at least __ mm [___ in.]

A

75 mm [ 3 inches ]

35
Q

Transportation time shall not exceed ____ hours

A

4 hours

36
Q

Ensure that specimens have been moved to the initial curing location no later than ___ minutes after molding operations have been completed.

A

15 minutes

37
Q

Final Curing of Cylinders - Upon completion of initial curing and within ___ minutes after removing the molds, cure specimens with free water maintained on their surfaces at all times at a regular temperature of 73.5 +/- 3.5*F

A

30 minutes

38
Q

TRUE or FALSE:
Final curing of beams to be done in the same manner as cylinders, except that they shall be stored in water saturated with calcium hydroxide at 73.5 +/- 3.5*F

A

True

39
Q

When field curing, store cylinders in or on the ________ as near to the point of deposit of the concrete represented as possible.

A

Structure

40
Q

When field curing, protect all surfaces of the cylinders from the ________ in as near the same way as the _______ work.

A

Elements

Formed

41
Q

When field curing, provide the cylinders with the same ___________ and ________ environment as the structural work.

A

Temperature

Moisture

42
Q

TRUE or FALSE:
Specimens made for the purpose for determining when a structure is capable of being put in service shall be removed from the molds at least 1 hour prior to removal of the form work.

A

False - specimens shall be removed from the molds AT THE TIME of removal of form work.

ACI - Field Testing Technician - Grade 1 (6 decks)

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