Concrete Field Testing Technician Grade I Certification Training POSSIBLE ACTUAL 141 QUESTIONS AND A

Concrete Field Testing Technician Grade I Certification Training POSSIBLE ACTUAL 141 QUESTIONS AND ANSWERS 2026-2027 Correct Incorrect

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__

2 of 141 Term

Measures other than air meter bowls used for this test must conform to ASTM __ _.

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C33

C40

C31

C29

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3 of 141 Term

The pressure method of determining air content cannot be used on concrete containing the following types of aggregates, _____, , _____.

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Lightweight, air-cooled blast furnace slag, or aggregates of high porosity

Dense, compacted, or synthetic aggregates

Heavyweight, high-density aggregates

Natural sand, gravel, or crushed stone Don't know?

4 of 141 Term

If the concrete contains aggregate larger than the maximum allowed for this test, the sample must be _.

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Dried and screened over a 2 in. (50 mm) sieve

Filtered using a 1 in. (25 mm) screen

Sieved through a 3/4 in. (19 mm) sieve

Wet sieved over a 1 1/2 in. (37.5 mm) sieve

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5 of 141 Term

For use in the slump test, the end or both ends of the tamping rod must be _ _.

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Beveled to a tapered end

Rounded to a hemispherical tip Square to a flat edge

Pointed to a sharp tip

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6 of 141 Term

The sample of concrete used for this test is to be obtained in accordance with what ASTM Standard?

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C172

C160

C185

C143

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7 of 141 Term

The molding of strength test specimens shall begin within _____ minutes after fabricating the composite sample.

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15

5

25

3

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8 of 141 Term

When large amounts of alcohol are used, the direct reading will tend to indicate a __ air content.

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Lower

Variable

Higher

Stable

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9 of 141 Term

Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have an initial curing temperature between _.

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78 and 88 degrees F [26 and 31 C]

48 and 58 degrees F [9 and 14 C]

68 and 78 degrees F [20 and

58 and 68 degrees F [14 and 20 C]

26 C]

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10 of 141 Term

What method of consolidation must be used when the slump is greater than 3 in. [75 mm]?

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Vibration

Tamping

Pumping

Rodding

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11 of 141 Term

It is necessary to tap the sides of the bowl after each layer has been rodded. True or False?

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2 equal

True

Vibration

False

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12 of 141 Term

When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch

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25

C172

2

15

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13 of 141 Term

The temperature measuring device shall be calibrated _____, or whenever there is a question of _.

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Annually, accuracy

Quarterly, inspection

Bi-annually, maintenance

Monthly, calibration

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14 of 141 Term

The concrete sample must be protected from contamination and _____.

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Rapid evaporation

Overhydration

Extreme cooling

Excessive drying

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15 of 141 Term

When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _.

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Removed by wet sieving the sample over 1.5 in. [37.5 mm] sieve

Chemically dissolved

Ground into fine powder

Heated and melted

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16 of 141 Definition

Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16 in.] diameter, length at least 100 mm [4 in.] greater than the depth of the measuring bowl, but not greater than 600 mm [24 in.] in overall length, with the tamping end rounded to a hemispherical tip of the same diameter as the rod.

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

What are the required characteristics of the tamping

be made?

What is the minimum allowable capacity of the measuring bowl used in this test method?

rod used in this test method?

Field Curing is the curing method used when test specimens are to be used for _____ _.

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17 of 141 Term

What is the required minimum frequency of the vibrator used in this test method?

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Slump, air content, temperature

7000 vibrations per minute

1/2 in. [12 mm]

9000 vibrations per minute [150 Hz]

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18 of 141 Term

When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be _____ _____ before making the test.

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Chemically treated

Wet sieved

Dry sieved

Thermally processed

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19 of 141 Term

What must be done if the concrete drops below the top of the slump mold while the top layer is being rodded?

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Add additional concrete to keep an excess of concrete above the top of the mold at all times

Add water to maintain moisture level

Compress the concrete to fit within the mold

Remove excess concrete from the top of the mold Don't know?

20 of 141 Term

Cylinders made for the purpose of determining when a structure may be put into service shall be removed from the mold ______ _.

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At the completion of curing process

At the time of the removal of formwork

After final strength testing

One week after molding

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21 of 141 Term

If vibration is the method of consolidation, the measure must be filled in ___ approximately equal layers.

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0.25%

2

C231, C29

25

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22 of 141 Term

What is the approximate volume of the measuring cup used to add water to the air meter, in relation to teh volume of the air meter bowl?

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1.00% +- 0.04%

5.00% +- 0.04%

0.50% +- 0.04%

2.00% +- 0.04%

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23 of 141 Term

After rodding each layer, what should be done to the measure before adding another layer of concrete?

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Tap the sides of the measure smartly 10 to 15 times with the mallet

Rotate the measure in a circular motion

Tilt the measure to one side

Shake the measure vigorously

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24 of 141 Term

The slump of the concrete is measured and reported to the nearest _____.

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1/4 in. [5 mm]

1/2 in. [10 mm]

1 in. [25 mm]

3/4 in. [20 mm]

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25 of 141 Term

What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh

concrete.

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Smooth the concrete around the temperature measuring device

Compact the concrete around the temperature measuring device

Gently press the concrete around the temperature measuring device at the surface of the concrete

Level the concrete around the temperature measuring device

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26 of 141 Term

The height of the slump mold is __ _.

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12 in. [300 mm]

10 in. [250 mm]

8 in. [200 mm]

14 in. [350 mm]

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27 of 141

Term

Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. True or False?

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False

True

False; specimens are to be demoled and placed in water storage tanks or moist rooms with free water at a temperature of 73.5 +- 3.5 degrees F [23.0 +- 2.0 C]

Bottom of the meniscus

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28 of 141 Term

What are the requirements for the tamping rod used in the test method?

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Flat, straight steel bar at least 1/8 by 3/4 by 12 in. [3 by 20 by 300 mm] or a 4.4 flat, straight high-density polyethylene bar, or other plastic of equal or greater abrasion resistance, at least 1/4 by 3/4 by 23 in [6 by 30 by 300 mm].

Rod each layer throughout its depth; on the second and final layers, the rod should penetrate into the previous layer approximately 1 in. [25 mm]

Round, straight 5/8 [16 mm] +- 1/16 in. [2 mm] diameter rod at least 5 in. [300 mm] greater in length than the depth of the bowl being used, with the tamping end rounded to a hemispherical tip of the same diameter, made of steel, high-density polyethylene, or other plastic of equal or greater abrasion resistance.

Slump, air content, temperature

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29 of 141 Term

If rodding is the method of consolidation being used, the measure must be filled in how many layers?

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3

The test is invalid

Tap the sides of the measure smartly 10 to 15 times with the mallet

5

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30 of 141 Term

If the concrete sample is to be consolidated by vibration, the measure is filled in _ layers.

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4 equal

2 equal

1 single

3 unequal

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31 of 141 Term

The sample of concrete used in this test method must be obtained in accordance with what ASTM Standard?

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C170

C173

C172

C175

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32 of 141 Term

When rodding each upper layer of concrete in a cylinder, the tamping rod should penetrate into the underlying layer by about _____.

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3 in. [75 mm]

0.5 in. [12 mm]

2 in. [50 mm]

1 in. [25 mm]

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33 of 141 Term

The container for obtaining the concrete sample used in this procedure can be a _____, _____, or _.

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Glass container, paper bag, styrofoam cooler

Metal pan, wheelbarrow, flat, clean nonabsorbent mixing

Rubber tub, plastic sheet, metal foil

Plastic bucket, cardboard box, wooden crate

board Don't know?

34 of 141 Term

If portions of undisturbed concrete are found in the air meter at the end of the test, _ _.

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The test is repeated with more agitation

The test is accepted with a note

The test is invalid

The test is adjusted for concrete density

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35 of 141 Term

The temperature of concrete may be measured in a wall form. True of False

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True

Middle

Three (3)

Higher

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36 of 141 Term

What are the requirements for the strike-off bar used in this test method?

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Determination of whether the structure is capable of being put into service; Comparison with standard cured specimens test results or with results from various in-place test methods; Adequacy of curing and protection of concrete in the Structure, or Form or shoring removal time requirements

Flat, straight steel bar at least 1/8 by 3/4 by 12 in. [3 by 20 by 300 mm] or a 4.4 flat, straight high-density polyethylene bar, or other plastic of equal or greater abrasion resistance, at least 1/4 by 3/4 by 23 in [6 by 30 by 300 mm].

Dampen (with water)

Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16 in.] diameter, length at least 100 mm [4 in.] greater than the depth of the measuring bowl, but not greater than 600 mm [24 in.] in overall length, with the tamping end rounded to a hemispherical tip of the same diameter as the rod.

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37 of 141 Term

What must be done to the sample container prior to sampling the concrete?

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Press concrete around measuring device

Verify conformance to a specified requirement for temperature of concrete

Dampen (with water)

Add additional concrete to keep an excess of concrete above the top of the mold at all times

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38 of 141 Term

Air meter bowls used for this test must conform to ASTM _____ and be calibrated for volumee according to ASTM _.

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C231, C29

C235, C31

C240, C33

C220, C40

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39 of 141 Term

Cylinders that are to be field cured are stored __________ and protected __________.

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In or on the structure as near to the point of deposit of the concrete represented as possible; In as near as possible the same way as the formed work

Determination of whether the structure is capable of being put into service; Comparison with standard cured specimens test results or with results from

various in-place test methods; Adequacy of curing and protection of concrete in the Structure, or Form or shoring removal time requirements Rod each layer throughout its depth; on the second and final layers, the rod should penetrate into the previous layer approximately 1 in. [25 mm]

Round, straight 5/8 [16 mm] +- 1/16 in. [2 mm] diameter rod at least 5 in. [300 mm] greater in length than the depth of the bowl being used, with the tamping end rounded to a hemispherical tip of the same diameter, made of steel, high-density polyethylene, or other plastic of equal or greater abrasion resistance.

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40 of 141 Term

Transportation time shall not exceed ___ _.

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4h

8h

C29

True

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41 of 141 Term

When rodding the bottom layer, the tamping rod must be ____ to uniformly distribute the strokes.

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Slightly inclined

Parallel to the surface

Perfectly vertical

Slightly angled upwards

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42 of 141 Term

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

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C173

C175

C172

C170

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43 of 141 Term

The maximum allowable time between obtaining the first and final portions of a composite sample is minutes.

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15

25

C172

2

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44 of 141 Term

The approximate concrete depth (in verticle distance) after placing the first layer is _____, and the second layer is _.

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2 5/8 in. [70 mm], 6 1/8 in. [160

3 1/4 in. [80 mm], 5 1/2 in. [140 mm]

3 in. [75 mm], 6 3/4 in. [170 mm]

mm]

2 1/4 in. [60 mm], 7 in. [180 mm]

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45 of 141

Term

After molding test specimens, you should wait two hours before moving them to the location of initial storage. True or False?

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False

Clean off any excess concrete

At least 2 minutes but not more than 5 minutes

False; the specimens must be moved immediately

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46 of 141 Term

How long should the air meter be inverted and agitated?

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No more than three seconds at a time, but must be repeated for a minimum of 60 seconds to free

No more than fifteen seconds at a time, but must be repeated for a minimum of 40 seconds to free

concrete from the base

concrete from the base

No more than ten seconds at a time, but must be repeated for a minimum

No more than five seconds at a time, but must be repeated

of 30 seconds to free concrete from the base

for a minimum of 45 seconds to free concrete from the base

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47 of 141 Term

In rodding the sample, how deep should the rod penetrate each layer?

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Rod bottom layer to full depth; rod second and final layer penetrating the previous layer about 25 mm (1 in.)

Rod each layer penetrating the layer below about 50 mm (2 in.)

Rod middle layer to full depth; rod top and bottom layers penetrating about 10 mm (0.4 in.)

Rod top layer to full depth; rod bottom layer penetrating the previous layer about 25 mm (1 in.)

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48 of 141 Term

The concrete sample must be obtained in accodance with what ASTM method?

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C160

C150

C172

C185

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49 of 141 Term

For cylinders with a diameter of 6 in. [150 mm] or greater, the tamping rod must be a round, straight steel rod with a diameter of _____.

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3/4 +- 1/16 in [19 mm +- 2 mm]

5/8 +- 1/16 in [16 mm +- 2 mm]

1/2 +- 1/16 in [13 mm +- 2 mm]

7/8 +- 1/16 in [22 mm +- 2 mm]

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50 of 141 Term

When consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer?

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Wet sieved

Three (3)

3 in. [75 mm]

Higher

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51 of 141 Term

The slump mold is filled in ____ layers.

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3

2

25

5

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52 of 141 Term

The supporting surface on which specimens are stored shall be level within _ _.

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1/8 in. per ft. [10 mm per m]

1/4 in. per ft. [20 mm per m]

3/4 in. per ft. [60 mm per m]

1/2 in. per ft. [40 mm per m]

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53 of 141 Term

The interior surface of the slump mold is allowed to have minor irregularities. True or False?

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True

C172

2 equal

False

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54 of 141 Term

What is the specified number of strokes required when rodding each layer of concrete?

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3

5

1.25 +- 0.50 lb. [600 +- 200 g]

25

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55 of 141 Term

The minimum size sample for making strength test specimens is ___ _.

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14 L (0.5 ft^3)

35 L (1.25 ft^3)

7 L (0.25 ft^3)

28 L (1ft^3)

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56 of 141 Term

When internal vibration is used to consolidate a standard flexural strength test specimen, the technician should insert the bibrator at intervals not exceeding _____ along the center line of the beam.

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9 in. [230 mm]

6 in. [150 mm]

3 in. [75 mm]

12 in. [300 mm]

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57 of 141 Term

The maximum size aggregate allowed for this test method is___ _.

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100 mm (4 in.)

50 mm (2 in.)

75 mm (3 in.)

30 mm (1.2 in.)

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58 of 141 Term

For a measure of 0.5 ft^3 [14 L], what is the required number of strokes of the tamping rod for consolidation of each layer?

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2

3

25

5

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59 of 141 Term

Upon final filling of the air meter with water, what part of the liquid level should be adjusted to teh zero mark on the meter?

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Top of the meniscus

Bottom of the meniscus

Middle of the meniscus

Top of the foam

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60 of 141 Term

If less than 2.5 pints of alcohol are used, the air content is always indicated by the inal meter reading. True or False?

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Remove a representative portion of the excess concrete with a trowel or scoop

False, if the air content is more than 9%, the number of calibrated cups of water introduced into the meter to bring the liquid level within the graduated range must be added

Remove a representative quantity of concrete with the scoop or trowel before the strike off

Bottom of the meniscus

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61 of 141 Term

The minimum frequency of an internal vibrator used in this procedure is _ _.

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1/4 in. per ft. [20 mm per m]

1 1/2 in. (37.5 mm)

9000 vibrations per minute [150 Hz]

Rounded to a hemispherical tip

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62 of 141 Term

Why is the isopropyl alcohol added to the meter?

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To increase the viscosity of the water

To enhance the color of the water

To dispel any foam that may be on the surface of the water

To stabilize the temperature of the water

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63 of 141 Term

How much time is allowed to conduct the slump test from beginning to completion?

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2 1/2 minutes

30 seconds

10 minutes

5 minutes

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64 of 141 Term

A 6 by 12 in [150 mm by 300 mm] cylinder mold can be used for concrete containing aggregate with particles not exceeding ____ in size, without the need for wet sieving the concrete.

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4 in. [100 mm]

3 in. [75 mm]

2 in. [50 mm]

1 in. [25 mm]

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65 of 141 Term

What method of consolidation must be used when the slump is less than 1 in. (25 mm]?

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Temperature

Radiation

Vibration

Explosion

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66 of 141 Term

For concrete with a slump of less than 1 in. [25 mm], the test specimens must be consolidated by _.

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Vibration

Rolling

Hand Tamping

Pressing

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67 of 141 Term

The surface on which the slump mold will be placed must be ___ _.

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Curved, smooth, dry, nonabsorbent, and exposed to wind

Flat, level, moist, nonabsorbent, and free of vibration

Sloped, textured, damp, absorbent, and exposed to sunlight

Rough, uneven, dry, absorbent, and subject to vibration

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68 of 141 Term

Specimens shall not be transported until ____after final set.

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8h

No more than five seconds at a time, but must be repeated for a minimum of 45 seconds to free concrete from the base

One-third

True

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69 of 141 Term

If, after consolidation of the final layer, the concrete level is 1/2 in. (13 mm) above the top of the measure, what should be done?

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Remove a representative portion of the excess concrete with a trowel or scoop

Compress the concrete to reduce volume

Add water to bring the level down

Mix the concrete thoroughly again

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70 of 141 Term

The measurement for slump is made from the top of the mold to what point of the concrete specimen?

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The displaced original center of the top surface of the specimen

The base of the concrete specimen

The highest point of the concrete specimen

The edge of the concrete specimen

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71 of 141 Term

After the final rodding, the sides of the slump mold should should be tapped lightly with the tamping rod. True or False?

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Middle

Three (3)

0.25%

False

72 of 141 Term

The slump mold should be in a dry condition before beginning the test. True or False?

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Correct answer False

73 of 141 Term

After consolidation of the final layer, an excess of concrete ____ above the top of the measure is considered optimum.

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Correct answer 1/8 in. [3 mm]

74 of 141 Term

The temperature of concrete is reported to the nearest ____ degrees F [ ___ C]

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Correct answer 1 degree F [0.5 C]

75 of 141 Term

What is the specified number of roddings for each layer?

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Correct answer 25

76 of 141 Term

When rodding a standard 6 by 12 in [150 mm by 300 mm] cylinder, each layer must be rodded _ times.

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Skipped

Correct answer 25

77 of 141 Term

What tools may be used to strike off the top surface of the concrete following consolidation of the final layer?

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Skipped

Correct answer A strike-off bar; a metal, glass, or acrylic plate

78 of 141 Term

The volumetric method of determining air content of concrete can be used on concrete containing what types of aggregate?

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Correct answer All types of aggregate

79 of 141 Term

What must be done if there is an excessive amount of concrete in measure following consolidation of the final layer?

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Correct answer Remove a representative quantity of concrete with the scoop or trowel before the strike off

80 of 141 Term

Sampling by this method is required when tests are to be made to determine _____ with specification requirements.

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Correct answer

Compliance

81 of 141 Term

A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False?

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Correct answer False

82 of 141 Term

How much time is allowed for lifting the slump mold?

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Correct answer 5 +- 2 seconds

83 of 141 Term

Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True of False?

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Correct answer True

84 of 141 Term

The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge.

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Correct answer 5

85 of 141 Term

What is the specified weight of the mallet used on measures that are 0.5 ft^3 [14 L] or smaller?

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Correct answer 1.25 +- 0.50 lb. [600 +- 200 g]

86 of 141 Term

The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is minutes.

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Skipped

Correct answer 5

87 of 141 Term

The temperature and moisture environment for field cured cylinders must be ____ _.

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Skipped

Correct answer The same as the structural work

88 of 141 Term

When consolidating a flexural strength test specimen by rodding, rod one stroke for each _____ of top surface area.

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Correct answer 2 in.^2 [14 cm^2]

89 of 141 Term

The composite samples from a truck mixer must be obtained from the _____ portion of the batch.

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Skipped

Correct answer

Middle

90 of 141 Term

After the temperature of the concrete is read, what is required?

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Correct answer Reporting of temperature

91 of 141 Term

The direct reading of the final liquid level in the neck of the air meter, is estimated to teh nearest _.

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Skipped

Correct answer 0.25%

92 of 141 Term

Upon completion of initial curing, the test specimens may be left in their molds and sealed in plastic bags. True or False?

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Skipped

Correct answer False; specimens are to be demoled and placed in water storage tanks or moist rooms with free water at a temperature of 73.5 +- 3.5 degrees F [23.0 +- 2.0 C]

93 of 141 Term

How many times does the rolling operation occur?

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Correct answer A minimum of 2, a minimum of 3

94 of 141 Term

When rodding the concrete sample, what is the specified number of strokes required for each layer?

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Correct answer 25

95 of 141 Term

The maximum size aggregate allowed in this test method is__ _.

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Correct answer 1 1/2 in. (37.5 mm)

96 of 141 Term

A mallet weighing ____ must be used to tap the sides of the bowl after rodding each layer.

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Correct answer 1.25 +- 0.50 lb. (600 +- 200 g)

97 of 141 Term

The mold for making the slump test is in the shape of __ _.

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Correct answer The frustum of a cone

98 of 141 Term

A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False?

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Correct answer

False

99 of 141 Term

During transportation, test specimens must be protected from damage due to _____, _____, and _.

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Correct answer Jarring, freezing temperatures, moisture loss

100 of 141 Term

What must be done if there is a slight deficiency in the quantity of concrete in the measure of consolidation of final layer?

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Correct answer Add a quantity of representative concrete before strike off

101 of 141 Term

When using an internal vibrator to consolidate a 6 by 12 in. [150 mm by 300 mm] compressive strength test specimen, the vibrator must be inserted at _____ different points for each layer.

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Correct answer 2

102 of 141 Term

Up to 48 hours after molding, test specimens that are to be standard cured shall be stored in a temperature range between _____ to _.

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Correct answer 60 and 70 degrees F [16 and 27 C]

103 of 141 Term

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

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Correct answer Slump, air content, temperature

104 of 141 Term

What type of alcohol and concentration must be used in this test method?

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Correct answer Isopropyl, 70% by volume (65% by weight)

105 of 141 Term

The sample of concrete used for temperature determination must be rodded 25 times. True or False?

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Correct answer False

106 of 141 Term

Standard Curing is the curing method used when test specimens are to be used for ___ _.

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Correct answer Acceptance testing for specified strength, checking the adequacy of mixture proportions for strength, quality control

107 of 141 Term

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

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Correct answer

1/4 in. [6 mm]

108 of 141 Term

The slump test is applicable to plastic concrete with a maximum size aggregate of _ _.

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Correct answer 1.5 in. [37.5 mm]

109 of 141 Term

ASTM Method gives standardized requirements for _____, _____, _ , and _____, of test specimens.

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Correct answer Making, curing, protecting, transporting

110 of 141 Term

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

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Correct answer Clean off any excess concrete

111 of 141 Term

What is the minimum allowable capacity of the measuring bowl used in this test method?

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Correct answer 6 L (0.20 ft^3)

112 of 141 Term

The outside diameter or side dimension of the vibrating element must be at least _____ but not greater than _.

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Correct answer 0.75 in. [19 mm], 1.50 in. [38 mm]

113 of 141

Term

Each layer should fill approximately _____ the volume of the mold.

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Correct answer One-third

114 of 141 Term

According to ASTM C1064, what is one reason to take the temperature of concrete?

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Correct answer Verify conformance to a specified requirement for temperature of concrete

115 of 141 Term

How deep should the tamping rod penetrate into each layer?

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Correct answer Rod each layer throughout its depth; on the second and final layers, the rod should penetrate into the previous layer approximately 1 in. [25 mm]

116 of 141 Term

Field Curing is the curing method used when test specimens are to be used for _____ _.

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Correct answer

Determination of whether the structure is capable of being put into service; Comparison with standard cured specimens test results or with results from various in-place test methods; Adequacy of curing and protection of concrete in the Structure, or Form or shoring removal time requirements

117 of 141 Term

The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- ___ degrees F [+- _____ C] throughout a range of ___ _.

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Correct answer 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]

118 of 141 Term

The initial quantity of water and alcohol added to the air meter can be poured directly into the neck of the top section of the air meter.

True or False?

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Correct answer False; the funnel must be used

119 of 141 Term

Vibration of the concrete sample is not allowed when the slump of concrete exceeds _ _.

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Correct answer 75 mm (3 in.)

120 of 141 Term

If the air content is greater than the 9% range of the meter, ____.

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Correct answer Calibrated cups of water are added to ring the liquid level within the graduated range

121 of 141 Term

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

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Correct answer 1/2 in. [12 mm]

122 of 141 Term

When raising the slump mold, it should not be rotated or twisted, True or False?

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Correct answer True

123 of 141 Term

What is the specified size of the mallet required for this test method when the measuring bowl has the capacity of 14 L [0.5 ft^3] or less?

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Correct answer

0.60 +- 0.25 kg [1.25 +- 0.50 lb.]

124 of 141 Term

How long must the temperature measuring device remain in the freshly mixed concrete?

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Correct answer At least 2 minutes but not more than 5 minutes

125 of 141 Term

At the end of the procedure, the air meter is ____.

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Correct answer Disassembled and its contents examined

126 of 141 Term

If the concrete is to be consolidated by vibration, a standard 4 by 8 in. [100 mm by 200 mm] cylinder mold must be filled in equal layers.

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Correct answer 2

127 of 141 Term

The temperature of concrete may be measured in a wheelbarrow.

True or False?

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Correct answer True

128 of 141 Term

If the concrete sample contains aggregate larger than that allowed for this test, the sample must be _.

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Correct answer Wet sieved over a 1-in. (25-mm) sieve

129 of 141 Term

When filling the bowl of the air meter, the concrete must be placed in ___ layers of equal depth.

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Correct answer 2

130 of 141 Term

When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____ regularly spaced intervals during discharge of the middle portion of this batch.

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Correct answer 2

131 of 141 Term

This method covers sampling from four types of mixtures which are _____, _____, _____, and ____ _.

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Correct answer Stationary mixers, paving mixers, revolving drum mixers, and open top mixers

132 of 141 Term

The pressure method of determining air content can be used on concrete containing _____ aggregate.

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Correct answer

Relatively Dense

133 of 141 Term

A plastic container can be used for the measure in this method. True or False?

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Correct answer False, measure must be steel or another suitable metal

134 of 141 Term

If the concrete sample is to be consolidated by rodding, the measure is filled in _ layers.

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Correct answer 3 equal

135 of 141 Term

The sample of concrete for use in making the slump test must be obained in accordance with ASTM Standard _.

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Correct answer C172, Standard Practice for Sampling Freshly Mixed Concrete

136 of 141 Term

The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed

concrete.

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Correct answer 3 in. [75 mm]

137 of 141 Term

The diameter of the tamping rod used in the test method is ___ _.

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Correct answer 5/8 in. [16 mm]

138 of 141

Term

Prior to lifting the mold, concrete must be removed from __ _.

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Correct answer The area surrounding the base of the mold

139 of 141 Term

In order for an initial meter reading to be valid, the meter must not be leaking, the liquid level must stabilize within 6 minutes, and the foam on the surface of the liquid must not be greater than 2 full percent divisions. True or False?

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Correct answer True

140 of 141 Term

If more than 2.5 pints of alcohol are used, the final meter reading is always adjusted using _.

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Correct answer A correction factor

141 of 141 Term

What is the required shape of the tamping end of the rod?

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