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CMEC ACI WORKBOOK > ASTM C 31 - STRENGTH SPECIMEN CASTING > Flashcards

ASTM C 31 - STRENGTH SPECIMEN CASTING Flashcards

1
Q

_ inches greater — than _ times the depth of the beam in it’s tested position.

In beam molds -> what is the REQUIRED LENGTH?

A

Length at LEAST:

2 inches later — than 3 times the depth of the beam in its tested postion

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2
Q

5/8 inch AND _/8 inch +- 1/_ inch

What are the 2 types (diameter measurement) of tamping rods when making strength specimens?

A

5/8 inch AND 3/8 inch

+-

1/16 inch

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3
Q

What rod diameter do you use for a cylinder diameter that is 6 inches or greater?

A

5/8 inch

+-

1/16 inch

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4
Q

What rod diameter do you use for a cylinder diameter that is less than 6 inches?

A

3/8 inch

+-

1/16 inch

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5
Q

2_ inches?

What is the MAXIMUM length for both tamping rods?

A

24 inches

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6
Q

_ inches longer than the d…

What is the required length for BOTH tamping rods?

A

4 inches longer than the depth of the mold

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7
Q

9___ vibrations/minute

What is the minimum frequency (vibrations/minute) for an internal vibrator?

(150 Hz)

A

9000 vibrations/minute

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8
Q

1/_

“Internal vibrator with an outside diameter no more than __ the diameter or width of the specimen.”

A

1/4

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9
Q

_ inches longer than the d…

How many inches longer must the vibrator be than the length of the specimen?

A

At least 3 inches longer than the depth of the container

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10
Q

How often must the internal vibrator be checked by a tachometer for verification?

A

Every 2 years

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11
Q

1.__ lbs +- 0.5 lbs

What is the required mallet weight for a 1/2 ft3 measure and smaller?

A

1.25 lbs

+-

0.5 lbs

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12
Q

2.__ lbs +- 0.5 lbs

What is the required mallet weight for a larger than 1/2 ft3 measure?

A

2.25 lbs

+-

0.5 lbs

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13
Q

6 x _ inches – _ x 8 inches

What are the 2 types of cylinder molds (_x_) used when casting strength specimens?

A

1) 6 x 12 inches
2) 4 x 8 inches

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14
Q

Nominal size of aggregate exceeds _ inches

When must you wet sieve a concrete sample when casting strength specimens?

A

Nominal max size of aggregate exceeds 2 inches

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15
Q

Do you cast beam molds in a horizontal position? (Y/N)

A

YES

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16
Q

“Beam length at least (1) _ inches greater than (2) _ times the depth of the beam in its tested position”

A

1) 2 inches
2) 3

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17
Q

4 in x _ in

What is the minimum beam dimension for a nominal aggregate size of 1 inches or less?

A

4 in x 4 in

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18
Q

6 in x _ in

What is the minimum beam dimension for a nominal aggregate size of 1 inch - 2 inches?

A

6 in x 6 in

19
Q

ROD OR VIBRATE OR BOTH

SLUMP > 3 IN

20
Q

ROD OR VIBRATE OR BOTH

SLUMP BETWEEN 1-3 INCHES

21
Q

ROD OR VIBRATE OR BOTH

SLUMP <1 INCH

22
Q

How many lifts do you make with a cylinder diameter of 4 inches (4x8)?

METHOD OF CONSOLIDATION – RODDING ONLY

23
Q

How many lifts do you make with a cylinder diameter of 6 inches (6x12)?

METHOD OF CONSOLIDATION – RODDING ONLY

24
Q

How many lifts do you make with a cylinder diameter of 9 inches?

25
Q

_5 Times

How many rod strokes do you do for cylinders with a diameter of 4 inches (4x8) AND 6 inches (6x12)?

METHOD OF CONSOLIDATION – RODDING ONLY

26
Q

How many rod strokes do you complete with a cylinder diameter of 9 inches?

METHOD OF CONSOLIDATION – RODDING ONLY

A

50 rod strokes

27
Q

How many lifts do you use with cylinders of 4, 6, AND 9 inch diameters?

METHOD OF CONSOLIDATION – VIBRATING ONLY

28
Q

How many insertions of the internal vibrator do you preform with a 4 inch cylinder diameter?

PER LAYER

A

1 insertion per layer

29
Q

How many insertions of the internal vibrator do you preform with a 6 inch cylinder diameter?

PER LAYER

A

2 insertions per layer

30
Q

How many insertions of the internal vibrator do you preform with a 9 inch cylinder diameter?

PER LAYER

A

4 insertions per layer

31
Q

_5 Minutes

“Place cylinders in initial curing location within __ minutes of casting.”

A

15 Minutes

32
Q

1 time for each _ in^2 of surface area

How many times do you rod EACH layer for a BEAM MOLD?

A

1 time for each 2 in2 of surface area

33
Q

A = L x _

What is the formula for AREA OF A BEAM MOLD

A

Area = Length x Width

34
Q

Rods = Area / _

What is the formula for the number of RODS to be preformed on a beam speciman?

A

Rods = Area / 2

35
Q

How many layers do you do WHEN CASTING A BEAM MOLD?

METHOD OF CONSOLIDATION – VIBRATING

36
Q

Every _ inches

How often do you insert the vibrator down the centerline of the BEAM speciman?

A

Every 6 inches

37
Q

Up to _8 hours

What is the MAXIMUM amount of time the INITIAL curing phase can last?

A

Up to 48 hours

38
Q

Within 1/_ inch per foot

What is the leveling requirments for the inital curing location?

A

Within 1/4 inch per foot

39
Q

What are the initial curing TEMPERATURE REQUIRMENTS for specimans less than 6,000 PSI?

A

60-80 degrees F

40
Q

What are the initial curing TEMPERATURE REQUIRMENTS for specimans 6,000 PSI and greater?

A

68 degrees F - 78 degrees F

41
Q

_ hours after final set

What is the earliest amount of time a speciman can be moved in?

(Hours)

A

8 hours after final set

42
Q

What is the maximum allowable transport time for cylinders?

43
Q

Within _0 minutes

How long does FINAL curing take AFTER MOLD REMOVAL?

A

Within 30 minutes

44
Q

7_.5 Degrees F +- _.5 Degrees F

What is the required TEMPERATURE for the CURING ROOMS AND SOAK TANKS at the lab?

A

73.5 Degrees F

+-

3.5 Degrees F

CMEC ACI WORKBOOK (11 decks)

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