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Concrete Field Technician - G1 > Section 4: Density (Unit Weight) and Yield** > Flashcards

Section 4: Density (Unit Weight) and Yield** Flashcards

1
Q

What is the length of tamping rod?

A

4 inches taller than the equipment 16 to 24 inches

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2
Q

Minimum frequency of vibrator in density test?

A

9000 vibrations per minute

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3
Q

Size of vibrator in density test?

A

3/4 to 1 1/2 inches in diameter

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4
Q

What is the minimum thickness of a strike-off plate made of glass or acrylic?

A

1/2 inch

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5
Q

How much wider must a strike-off plate be?

A

1 inch on all sides

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6
Q

What is the minimum thickness of a strike-off plate made of metal?

A

1/4 inch

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7
Q

What is the weight of a mallet used for measures 1/2 ft3 or less?

A

1 1/4 lb +/- 1/2 lb (3/4 to 1 3/4 lb)

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8
Q

What is the weight of a mallet used for measures greater than 1/2 ft3?

A

2 1/4 lb +/- 1/2 lb (1 3/4 to 2 3/4 lb)

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9
Q

What method of consolidation must be used when the slump is greater than 3 inches?

A

Rodding

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10
Q

What method of consolidation must be used when the slump is less than 1 inch?

A

Vibration

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11
Q

If rodding during a density test, how many layers?

A

3

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12
Q

If using a vibrator during a density test, how many layers?

A

2

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13
Q

How accurate should density be recorded?

A

0.1 lb/ft3

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14
Q

What happens during each layer during a density test? (Rodding)

A
  • Adding 1/3 of volume
  • Rodding 25 times
  • Tapping side 10 to 15 times, evenly distributed
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15
Q

What is the ideal amount of excess concrete above the measure during a density test?

A

1/8 inch

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16
Q

How much of the surface is covered with a strike-off plate during a density test?

A

2/3

17
Q

After completing the strike-off procedure, what must be done before weighing the measure and sample?

A

Cleaning

18
Q

Relative Yield

A

Actual Yield / Design Yield

19
Q

Theoretical Density

A

Air Free Unity Weight

Concrete Field Technician - G1 (6 decks)

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