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CMEC ACI WORKBOOK > STUDY QUESTIONS > Flashcards

STUDY QUESTIONS Flashcards

1
Q

_5 minutes

What is the maximum allowable time BETWEEN THE FIRST AND FINAL PORTION OF THE COMPOSITE SAMPLE?

A

15 MINUTES

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2
Q

Begin test for SLUMP AND AIR within _ minutes after obtaining the final portion of the composite sample?

A

5 MINUTES

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3
Q

_5 minutes

Begin CASTING STRENGTH SPECIMENS WITHIN _ minutes after obtaining the final portion of a composite sample?

A

15 MINUTES

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4
Q

REVOLVING DRUM TRUCK MIXTURES are sampled at (1)_+ locations in the (2)_ portion of the batch?

A

(1) 2+ LOCATIONS
(2) MIDDLE PORTION

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5
Q

1) _0%

CONTINUOUS FEED MIXTURES – shall not be sampled until:

1) _% of the material has been discharged
2) All adjustments have been made

A

50%

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6
Q

_-5 Minutes

After sampling from a CONTINUOUS MIXER – wait for _-_ minutes BEFORE the beginning test.

A

2-5 MINUTES

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7
Q

PAVEMENT MIXERS are sampled after _ concrete has been discharged.

A

ALL concrete has been discharged

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8
Q

PAVEMENT MIXTURES will be sampled around _ locations of the concrete mass?

A

5 LOCATIONS

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9
Q

If the concrete contains aggregate TOO LARGE for the test equipment - you must __ prior to testing?

A

WET SIEVE

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10
Q

_ft^3

What is the MINIMUM SAMPLE SIZE for casting STRENGTH SPECIMENS?

A

1 ft3

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11
Q

Temperature sensing devices SHALL BE ACCURATE TOO: +- _ F.

A

+- 1 F

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12
Q

30 - 1__ F

Temperature sensing devices shall be readable to the range of _-_ F.

A

30-120 F

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13
Q

_2 Months

Dial and Digital thermometers MUST BE CALIBRATED AT LEAST every __ MONTHS?

A

12 Months

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14
Q

Reference thermometer calibrations must BE TRACEABLE to the _ _ _ _.

A

NIST

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15
Q

0._F

REFERENCE THERMOMETERS must be accurate to the +- _F

A

+- 0.5 F

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16
Q

_ around the thermometer.

After thermometer immersion in concrete, you must _ to prevent the effect from ambient air from entering the thermometer.

A

COMPACT the concrete around the thermometer.

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17
Q

Temperature sensing device must be left in a sample at least (1)_ but no more than (2)_ minutes.

A

(1) 2 MINUTES
(2) 5 MINUTES

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18
Q

Temp of concrete is recorded TO THE NEAREST __?

A

DEGREE

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19
Q

Use __ INSTEAD OF WATER to calibrate thermometers.

A

OIL

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20
Q

(2) _0 degrees apart

Thermometers must be calibrated at least (1) _ temperatures – (2)__ degrees apart.

A

(1) 2
(2) 30

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21
Q

The slump mold is in THE SHAPE OF A __.

A

FRUSTRUM

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22
Q

1/__ inches

The dimensions of the slump mold MUST BE MAINTAINED within __ inches.

A

1/8 inches

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23
Q

The slump cone is filled in (1)_ layers by (2)__.

A

(1) 3 Layers
(2) Volume

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24
Q

1 1/_ inches

MAXIMUM NOMINAL AGGREGATE SIZE allowed for SLUMP test is __ inches.

A

1 1/2 inches

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25
Q

(2) 1 1/_ inch sieve

If concrete contains aggregate larger than allowed you must (1)__ over a (2) __ sieve.

A

(1) Wet Sieve
(2) 1 1/2 Sieve

26
Q

_2 inches

Slump mold is raised to the height of __ inches AT THE END of the test.

27
Q

Slump cone must be raised in time frames of (1)_ seconds +- (2)_ seconds.

A

(1) 5 Seconds
(2) +- 2 Seconds

28
Q

1/_ inches

Measure and record slump measurement to the nearest __ inch.

A

1/4 inches

29
Q

Me__ OR St__

Measures (buckets) must be made of __ OR __.

A

1) METAL
2) STEEL

30
Q

1/4 inches OR 1/2 inches?

The thickness of Metal, Glass, and Plastic strike-off plates?

A

Metal - 1/4 inch

Glass AND Plastic - 1/2 inch

31
Q

1/_ inches of concrete

After the consolidation of the final lift of concrete in the air pressure meter test – there should be __ inches of concrete above the rim of the measure.

A

1/8 inches of concrete

32
Q

Consolidation at slumps:

(1) Greater than 3 inches
(2) Between 1-3 inches
(3) Less than 1 inch

A

(1) RODDING
(2) VIBRATION OR RODDING
(3) VIBRATION

33
Q

Rod each layer _5 times.

Rodding Methods w/ MEASURE SIZE at:

1/2 ft3 (14L)

A

Rod each layer 25 TIMES

34
Q

Rod each layer _0 times.

Rodding Methods w/ MEASURE SIZE at:

1 ft3 (28L)

A

Rod each later – 50 TIMES

35
Q

Rodding Methods w/ MEASURE SIZE LARGER THAN at:

1 ft3

A

Rod each layer 1 time for each 3 in2 of surface area.

36
Q

Calculate DENSITY of the concrete given the following:

Weight of Measure = 20.5 lbs

Volume of Measure = 0.504 ft3

Weight of Measure full of concrete = 90.5 lbs

A

ANSWER:

UW= 138.89 lbs/ft3

37
Q

Calcualte the YIELD of the concrete given the following:

9 yd3 = Batch Weight = 34300 lbs

Density = 140 lbs/ft3

A

y = 9.07 yd3

38
Q

Calc Relative Yield given the following:

9 yd3 = Batch Weight = 34300 lbs

Density = 140 lbs/ft3

y = 9.07 yd3

(NEED ANSWER)

39
Q

The air meter must be calculated every _ months.

40
Q

The VOLUMETRIC air meter must be filled in _ lifts.

A

2 equal lifts by volume

41
Q

1/_ inches?

A METAL strike-off bar must be at least __ inches thick.

A

1/8 inches thick

42
Q

1/_ inches

A PLASTIC strike-off bar needs to be __ inches thick.

A

1/4 inches thick

43
Q

What is the FIRST LIQUID that is poured into the air meter?

44
Q

_0% isopropyl alcohol

What is the % of isopropyl alcohol that is added to the meter?

A

70% of isopropyl alcohol

45
Q

_5 seconds at a time

The VOLUMETRIC air meter is inverted and agitated for a MINIMUM of __ at a time.

A

45 seconds at a time

46
Q

The VOLUMETRIC air meter cannot be inverted more than _ seconds.

47
Q

The rolling operation for the volumetric air meter must occur as a whole a MINIMUM of _ times.

A

Minimum of 2 times

48
Q

(1) 1/_%

A stable reading is when the water level does not drop by more than (1) __% in (2) __ minutes.

A

(1) 1/4%
(2) 2 minutes

49
Q

(2) Add whole __

If the initial reading is beyond the (1)_% of the meter – you must (2)__.

A

(1) 9%
(2) Added whole cups of calibrated water until the water level is within the site glass.

50
Q

(1) 1/_% (2) Repeat __ procedure

If second reading is greater than (1)__% different from the initial reading, you must (2)__

A

(1) 1/4%
(2) Repeat the rolling operation a third time

51
Q

There is allowed to be up to _% of foam over the water level on the initial reading

52
Q

You have up to _ minutes for the initial reading to become stable.

A

Up to 6 minutes

53
Q

If more than (1)_ pints of alcohol is added – an (2)__ must be subtracted to the final calculation

A

(1) 2 Pints
(2) Alcohol Correction Factor

54
Q

(2) _5 times (3) _/8 inch +- 1/_ inch rod

4x8 cylinder molds are filled in (1) __ lifts and rodded (2)__ times per layer with a (3)__ diameter rod.

A

(1) 2 lifts
(2) 25 times
(3) 3/8 inch +- 1/16 inch rod

55
Q

(2) _5 times per layer (3) _/8 inch +- 1/_ inches

6x12 cylinder molds are filled in (1) __ lifts and rodded (2)__ times per layer with a (3)__ diameter rod.

A

(1) 3 lifts
(2) 25 times per layer
(3) 5/8 inch +- 1/16 inch

56
Q

60-_ F

Specimens to be standard cured shoud be kept in a temperature range of __ if the strength is less than 6000 psi.

57
Q

_8 - _8 F

Specimens to be standard cured shoud be kept in a temperature range of __ if the strength is greater than 6000 psi.

58
Q

Transportation time of cylinders to a maximum of _ hours.

A

Maximum of 4 HOURS

59
Q

_0 minutes

Once the molds are removed from the specimens – they must be placed in final curing within __ minutes.

A

30 minutes

60
Q

(1) Temp__ (2) Moi__ (3) Str__

Field cured specimiens shall be the same (1)__ and the same (2)__ and cured in the same manner as the (3)__.

A

(1) Temperature
(2) Moisture
(3) Structure

61
Q

Molds for the field cured specimens should be removed when the __ are removed from the strucure.

CMEC ACI WORKBOOK (11 decks)

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