ASTM C 31 - STRENGTH SPECIMEN CASTING Flashcards by Alex S

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

In beam molds -> what is the REQUIRED LENGTH?

Length at LEAST:

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

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

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

5/8 inch AND 3/8 inch

1/16 inch

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

5/8 inch

1/16 inch

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

3/8 inch

1/16 inch

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2_ inches?

What is the MAXIMUM length for both tamping rods?

24 inches

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_ inches longer than the d…

What is the required length for BOTH tamping rods?

4 inches longer than the depth of the mold

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9___ vibrations/minute

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

(150 Hz)

9000 vibrations/minute

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1/_

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

1/4

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_ inches longer than the d…

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

At least 3 inches longer than the depth of the container

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

Every 2 years

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1.__ lbs +- 0.5 lbs

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

1.25 lbs

0.5 lbs

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2.__ lbs +- 0.5 lbs

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

2.25 lbs

0.5 lbs

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6 x _ inches – _ x 8 inches

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

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

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Nominal size of aggregate exceeds _ inches

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

Nominal max size of aggregate exceeds 2 inches

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

YES

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

1) 2 inches
2) 3

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4 in x _ in

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

4 in x 4 in

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6 in x _ in

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

6 in x 6 in

ROD OR VIBRATE OR BOTH

SLUMP > 3 IN

RODDING

ROD OR VIBRATE OR BOTH

SLUMP BETWEEN 1-3 INCHES

BOTH

ROD OR VIBRATE OR BOTH

SLUMP <1 INCH

VIBRATION

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

METHOD OF CONSOLIDATION – RODDING ONLY

2 lifts

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

METHOD OF CONSOLIDATION – RODDING ONLY

3 lifts

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

4 lifts

# \_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_**

25 Times

How many rod strokes do you complete with a cylinder diameter of 9 inches? **_METHOD OF CONSOLIDATION -- RODDING ONLY_**

50 rod strokes

How many lifts do you use with cylinders of **4, 6, AND 9 inch diameters**? **_METHOD OF CONSOLIDATION -- VIBRATING ONLY_**

2 Lifts

How many insertions of the internal vibrator do you preform with a **4 inch cylinder diameter**? ## Footnote **PER LAYER**

1 insertion per layer

How many insertions of the internal vibrator do you preform with a **6 inch cylinder diameter**? ## Footnote **PER LAYER**

2 insertions per layer

How many insertions of the internal vibrator do you preform with a **9 inch cylinder diameter**? ## Footnote **PER LAYER**

4 insertions per layer

# \_5 Minutes "Place cylinders in initial curing location within __ minutes of casting."

15 Minutes

# 1 time for each _ in^2 of surface area How many times do you rod **EACH** layer for a **BEAM MOLD**?

1 time for each 2 in² of surface area

# A = L x \_ What is the formula for **AREA OF A BEAM MOLD**

Area = Length x Width

# Rods = Area / \_ What is the formula for the number of RODS to be preformed on a beam speciman?

Rods = Area / 2

How many layers do you do **WHEN CASTING A BEAM MOLD**? **_METHOD OF CONSOLIDATION -- VIBRATING_**

1 Layer

# Every _ inches How often do you insert the vibrator down the centerline of the **BEAM speciman**?

Every 6 inches

# Up to \_8 hours What is the **MAXIMUM** amount of time the **INITIAL** curing phase can last?

Up to 48 hours

# Within 1/\_ inch per foot What is the **leveling requirments** for the inital curing location?

Within 1/4 inch per foot

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

60-80 degrees F

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

68 degrees F - 78 degrees F

# \_ hours after final set What is the earliest amount of time a speciman can be moved in? (Hours)

8 hours after final set

What is the maximum allowable transport time for cylinders?

4 hours

# Within \_0 minutes How long does FINAL curing take AFTER MOLD REMOVAL?

Within 30 minutes

# 7\_.5 Degrees F +- \_.5 Degrees F What is the required TEMPERATURE for the CURING ROOMS AND SOAK TANKS at the lab?

73.5 Degrees F +- 3.5 Degrees F