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ACI CONCRETE FIELD-TESTING TECHNICIAN GRADE 1 2024-
EXAM QUESTIONS WITH ANSWERS
"The temperature of concrete may be measured in a wall form. True of False - CORRECT
ANSWER True"
"A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temperature. True of False? - CORRECT ANSWER False"
"What must be done to the sample container prior to sampling the concrete? - CORRECT
ANSWER Dampen (with water)"
"What must be done to the concrete surrounding the temperature measuring device after the
device is submerged in the fresh concrete. - CORRECT ANSWER Gently press the concrete
around the temperature measuring device at the surface of the concrete"
"How long must the temperature measuring device remain in the freshly mixed concrete? -
CORRECT ANSWER At least 2 minutes but not more than 5 minutes"
"After the temperature of the concrete is read, what is required? - CORRECT ANSWER
Reporting of temperature"
"The temperature of concrete is reported to the nearest _____ degrees F [_____ C] - CORRECT
ANSWER 1 degree F [0.5 C]"
"This method covers sampling from four types of mixtures which are _____, _____, _____, and
_____. - CORRECT ANSWER Stationary mixers, paving mixers, revolving drum mixers, and
open top mixers" "The maximum allowable time between obtaining the first and final portions of a composite
sample is _____ minutes. - CORRECT ANSWER 15"
"Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
sample. True of False? - CORRECT ANSWER True"
"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. -
CORRECT ANSWER 5"
"The molding of strength test specimens shall begin within _____ minutes after fabricating the
composite sample. - CORRECT ANSWER 15"
"The concrete sample must be protected from contamination and _____. - CORRECT ANSWER
Rapid evaporation"
"The minimum size sample for making strength test specimens is _____. - CORRECT ANSWER
28 L (1ft^3)" "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 - CORRECT ANSWER 2"
"The composite samples from a truck mixer must be obtained from the _____ portion of the
batch. - CORRECT ANSWER Middle"
"When the concrete contains aggregate larger than that permitted for a particular test method,
the sample of concrete must be _____ _____ before making the test. - CORRECT ANSWER
Wet sieved"
"The slump test is applicable to plastic concrete with a maximum size aggregate of _____. -
CORRECT ANSWER 1.5 in. [37.5 mm]"
"When the concrete contains aggregate larger than allowed for the slump test, the large
aggregate must be _____. - CORRECT ANSWER Removed by wet sieving the sample over 1.
in. [37.5 mm] sieve"
"The mold for making the slump test is in the shape of _____. - CORRECT ANSWER The
frustum of a cone"
"The height of the slump mold is _____. - CORRECT ANSWER 12 in. [300 mm]"
"How much time is allowed to conduct the slump test from beginning to completion? -
CORRECT ANSWER 2 1/2 minutes"
"The diameter of the tamping rod used in the test method is _____. - CORRECT ANSWER 5/
in. [16 mm]"
"What is the required shape of the tamping end of the rod? - CORRECT ANSWER Rounded to a
hemispherical tip"
"What is the required minimum frequency of the vibrator used in this test method? - CORRECT
ANSWER 7000 vibrations per minute"
"The outside diameter or side dimension of the vibrating element must be at least _____ but not
greater than _____. - CORRECT ANSWER 0.75 in. [19 mm], 1.50 in. [38 mm]"
"A plastic container can be used for the measure in this method. True or False? - CORRECT
ANSWER False, measure must be steel or another suitable metal"
"What is the minimum thickness of a metal strike-off plate? - CORRECT ANSWER 1/4 in. [
mm]"
"What is the minimum thickness for a glass or acrylic strike-off plate? - CORRECT ANSWER 1/
in. [12 mm]" "What is the specified weight of the mallet used on measures that are 0.5 ft^3 [14 L] or smaller?
CORRECT ANSWER 1.25 +- 0.50 lb. [600 +- 200 g]"
"Measures other than air meter bowls used for this test must conform to ASTM _____. -
CORRECT ANSWER C29"
"Air meter bowls used for this test must conform to ASTM _____ and be calibrated for volumee
according to ASTM _____. - CORRECT ANSWER C231, C29"
"The concrete sample must be obtained in accodance with what ASTM method? - CORRECT
ANSWER C172"
"What method of consolidation must be used when the slump is greater than 3 in. [75 mm]? -
CORRECT ANSWER Rodding"
"What method of consolidation must be used when the slump is less than 1 in. (25 mm]? -
CORRECT ANSWER Vibration"
"If rodding is the method of consolidation being used, the measure must be filled in how many
layers? - CORRECT ANSWER 3"
"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? - CORRECT ANSWER 25"
"When rodding the middle and the top layers, the tamping rod should penetrate into the layer
below approximately _____. - CORRECT ANSWER 1 in. [25 mm]"
"The pressure method of determining air content can be used on concrete containing _____
_____ aggregate. - CORRECT ANSWER Relatively Dense"
"The pressure method of determining air content cannot be used on concrete containing the
following types of aggregates, _____, _____, _____. - CORRECT ANSWER Lightweight, air-
cooled blast furnace slag, or aggregates of high porosity"
"What is the minimum allowable capacity of the measuring bowl used in this test method? -
CORRECT ANSWER 6 L (0.20 ft^3)"
"The sample of concrete used for this test is to be obtained in accordance with what ASTM
Standard? - CORRECT ANSWER C172"
"The maximum size aggregate allowed for this test method is _____. - CORRECT ANSWER 50
mm (2 in.)" "If the concrete contains aggregate larger than the maximum allowed for this test, the sample
must be _____. - CORRECT ANSWER Wet sieved over a 1 1/2 in. (37.5 mm) sieve"
"If the concrete sample is to be consolidated by rodding, the measure is filled in _____ layers. -
CORRECT ANSWER 3 equal"
"The sample of concrete used in this test method must be obtained in accordance with what
ASTM Standard? - CORRECT ANSWER C172"
"The maximum size aggregate allowed in this test method is_____. - CORRECT ANSWER 1 1/
in. (37.5 mm)" "If the concrete sample contains aggregate larger than that allowed for this test, the sample must
be _____. - CORRECT ANSWER Wet sieved over a 1-in. (25-mm) sieve"
"When filling the bowl of the air meter, the concrete must be placed in _____ layers of equal
depth. - CORRECT ANSWER 2"
"What is the specified number of strokes required when rodding each layer of concrete? -
CORRECT ANSWER 25"
"It is necessary to tap the sides of the bowl after each layer has been rodded. True or False? -
CORRECT ANSWER True"
"How many times does the rolling operation occur? - CORRECT ANSWER A minimum of 2, a
minimum of 3"
"Why is the isopropyl alcohol added to the meter? - CORRECT ANSWER To dispel any foam
that may be on the surface of the water" "The direct reading of the final liquid level in the neck of the air meter, is estimated to teh nearest
_____. - CORRECT ANSWER 0.25%"
"If the air content is greater than the 9% range of the meter, _____. - CORRECT ANSWER
Calibrated cups of water are added to ring the liquid level within the graduated range" "If more than 2.5 pints of alcohol are used, the final meter reading is always adjusted using _____.
- CORRECT ANSWER A correction factor" "When large amounts of alcohol are used, the direct reading will tend to indicate a _____ air
content. - CORRECT ANSWER Higher"
"At the end of the procedure, the air meter is _____. - CORRECT ANSWER Disassembled and
its contents examined"
"If portions of undisturbed concrete are found in the air meter at the end of the test, _____. -
CORRECT ANSWER The test is invalid"
"ASTM Method gives standardized requirements for _____, _____, _____, and _____, of test
specimens. - CORRECT ANSWER Making, curing, protecting, transporting"
"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 _____. - CORRECT ANSWER 5/8 +- 1/16 in [16 mm +- 2
mm]"
"The minimum frequency of an internal vibrator used in this procedure is _____. - CORRECT
ANSWER 9000 vibrations per minute [150 Hz]"
"The container for obtaining the concrete sample used in this procedure can be a _____, _____,
or _____. - CORRECT ANSWER Metal pan, wheelbarrow, flat, clean nonabsorbent mixing
board" "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. -
CORRECT ANSWER 2 in. [50 mm]"
"The sample of concrete used in molding test specimens must be obtained in accordance with
what ASTM Standard? - CORRECT ANSWER C172"
"The supporting surface on which specimens are stored shall be level within _____. - CORRECT
ANSWER 1/4 in. per ft. [20 mm per m]"
"For concrete with a slump of less than 1 in. [25 mm], the test specimens must be consolidated by
_____. - CORRECT ANSWER Vibration"
"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. - CORRECT ANSWER 2"
The Method of determining air content of concrete containing lightweight aggregate is the
pressure method. True or False? - CORRECT ANSWER False"
"When making a test cylinder from concrete being used in construction, the field technician must
also measure the slump of the concrete. True or False? - CORRECT ANSWER True"
"While the technician is checking the slump of the concrete, there is a decided falling away or
shearing off of concrete from one side of the sample. What should the technician do? -
CORRECT ANSWER Disregard the test and retest on another portion of the sample"
"Preparation of specimens for transport includes - CORRECT ANSWER Determining that at
least 8 hours has elapsed since the final set" "If the aggregate correction factor for a given source of fine and coarse aggregate is found to be .2% in a pressure air meter, and an air content value of 5.0% is read on the gage of the same air
meter containing concrete with the same aggregate, what is the correct air content in %. -
CORRECT ANSWER 4.8% = 5.0 - 0.2"
"Strength test specimens transported from the field to the testing laboratory must be -
CORRECT ANSWER Protected from jarring, moisture loss, and freezing."
"Test for slump and air content must be started within __ after obtaining the final portion of the
composite sample. - CORRECT ANSWER 5 mins"
"The minimum size for samples to be used for strength tests is __. - CORRECT ANSWER 1 ft^
= 28 L"
"After strike off of the measure used to determine density, a small quantity of concrete may be
added to correct a deficiency. True or False? - CORRECT ANSWER False"
"For normal strength concretes, what temperature range must be maintained for test cylinders
during initial curing? - CORRECT ANSWER 60-80 deg F"
"When the concrete contains large aggregate, the testing technician should wet-sieve the sample
before making density (unit weight) tests for use in yield computations. True or False? -
CORRECT ANSWER False"
"Tamping rod should be - CORRECT ANSWER rounded"
"Start molding strength test specimens within __ after fabricating the composite sample. -
CORRECT ANSWER 15 mins"
"Representative samples are required for use in tests conducted for the purpose of determining
compliance with the specifications for concrete quality. True or False? - CORRECT ANSWER
True" "ASTM C173 specifies a minimum time requirement for inverting and agitating the meter to free
concrete from the base. True or False? - CORRECT ANSWER True"
"It is acceptable to fabricate a test specimen from the same concrete used for the air content test.
True or False? - CORRECT ANSWER False"
"ACI Certification Department - CORRECT ANSWER The department within ACI that manages
the certification programs"
"ACI concrete field testing technician- grade 1 - CORRECT ANSWER a person who has
demonstrated knowledge and ability to properly perform and record the results of seven specified field test on freshly mixed concrete by passing the ACI certification examinations"
"ASTM - CORRECT ANSWER ASTM international, which developed technical standards used in
this program"
"Examiner - CORRECT ANSWER A person authorized by ACI to be in responsible charge of an
examination session"
"JTA - CORRECT ANSWER Job task analysis, a detailed list of items of knowledge and skills that
can be used as a study guide for the examination"
"Recertification - CORRECT ANSWER a process to renew expired certifications by successfully,
completing the then current requirements"
"Sponsoring group - CORRECT ANSWER The local organization, such as ACI chapter trade
association, public agency, private testing laboratory or other organization, which takes
"Sampling Container - CORRECT ANSWER Made from a non-absorbent material not readily
attacked by cement paste and having a smooth internal face. It must be watertight and of sufficient rigidity to retain its shape when filled with concrete typically a wheelbarrow or plastic 5 gallon bucket or suitable."
"Plastic tarp or plastic sheet - CORRECT ANSWER To protect the concrete from moisture loss
and direct sun exposure"
ASTM C31 / C31M-06 - CORRECT ANSWER Standard Practice for Making, Curing, Protecting &
Transporting Test Specimens in the Field Conditions."
"ASTM C1064 /C1064M-05 - CORRECT ANSWER Standard Test Method for Temperature of
Freshly Mixed Hydraulic-Cement Concrete"
"ASTM C172 -07 - CORRECT ANSWER Standard Practice For Sampling Freshly Mixed Concrete
From Different Containers Used In The Production or Transportation Of Concrete."
"ASTM C143 / C143M-05a - CORRECT ANSWER Standard Test Method for Slump of Hydraulic-
Cement Concrete Both In Laboratory And In The Field"
"ASTM C138 / C138M-07 - CORRECT ANSWER Standard Test Method for Density (Unit
Weight), Yield, and Air Content (Gravimetric) of Concrete"
"ASTM C231 -04 - CORRECT ANSWER Standard Test Method for Air Content of Freshly Mixed
Concrete by Pressure Method"
"ASTM C173 / C173M-07 - CORRECT ANSWER Standard Test Method For Air Content of
Freshly Mixed Concrete Containing Any Type Of Aggregate, Whether It Be Dense, Cellular, or Lightweight by Volumetric Method"
"Molds - CORRECT ANSWER Mold for specimens shall be made of steel, cast iron, or other
nonabsorbent material, nonreactive with concrete. Molds shall be watertight and hold their dimensions and shape under all conditions of use."
"Tamping Rod - CORRECT ANSWER A round, straight steel rod having the tamping end or both
ends rounded to a hemispherical tip of the same diameter as the rod. Rod Dimensions are based off of the diameter of Cylinder or Width of Beam.
- less than 6 inch, Rod =Diameter 3/8 inch & Length 12inch
- 6 inch, Rod = Diameter 5/8 inch & Length 20 inches
- 9 inch, Rod = Diameter 5/8 inch & Length 26 inches [Rod tolerances length + or - 4inches and diameter + or - 1/16inch.]"
"Vibrators - CORRECT ANSWER Internal vibrators shall be used. The vibrator frequency shall
be at least 9000 vibrations per minute while the vibrator is operating in the concrete. The diameter of a round vibrator shall be no more than one fourth the diameter of the cylinder mold or width of the beam mold. The combined length of the vibrator shaft and vibrating element shall exceed the depth of the section being vibrated by at least 3 inches."
"Mallet - CORRECT ANSWER A mallet with a rubber or rawhide head weighing 1.25 + or - 0.5 lb
shall be used."
"Sampling Receptacle - CORRECT ANSWER The receptacle shall be a suitable Heavy Gage
metal pan, wheelbarrow, or flat, clean nonabsorbent board of sufficient capacity to allow easy remixing of the entire sample with a shovel or trowel."
"Temperature Measureing Device - CORRECT ANSWER Shall be capable of accurately
measuring the temperature 3 inches or more immersion of the freshly mixed concrete to plus or minus 1 degree Fahrenheit throughout the range of 30 - 120 degrees Feahrenheit. The device shall be readable and accurate to plus or minus 0.5 Feahrenheit. Verification of direct reading resistance reference temperature measuring devices shall be performed every twelve months."
"ASTM C1064 Standard Test Method for Temperature Procedure - CORRECT ANSWER -
Sample the freshly mixed concrete in accordance with Practice C
- Position the temperature measuring device so that the end of the temperature sensing portion is submerged 3 inches and at least 3 inches of concrete cover in all directions.
- Close all voids at surface of the concrete around the temperature device.
- Leave the temperature measuring device in the concrete for at least 2 mins but no more than 5 mins. -Then read and record to the nearest 1 degree Feahrenheit."
"ASTM C172 Standard Test Method For Section 40: - CORRECT ANSWER - The elapsed time
shall not exceed 15 mins. between obtaining the first and final portions of the composite sample.
- The sample shall be combined and remixed with a shovel to ensure uniformity. -Sample size is dictated by the maximum aggregate size and should be atleast 28 L (1cubic foot) for strength tests. -Start the test for slump, temperature, and air content within 5 mins. after obtaining sample. -Start molding specimens for strength tests within 15 mins. after obtaining the sample."
projections. Check mold conformance to specified dimensions when it is purchased and once a year."
"ASTM C143 Slump Procedure - CORRECT ANSWER - Dampen Slump Equipment and place it
on a rigid, flat, level moist, nonabsorbent surface, free of vibration and that is large enough to contain all of the slumped concrete.
- The cone shall be held firmly in place during filling and perimeter cleaning by operator standing on foot pieces or by a clamping arrangement.
- Immediately fill the mold in three layers, each approximately one third the volume of the mold. -Move scoop around the perimeter of the mold opening to ensure an even distribution of the concrete. -Rod each layer 25 times with vertical strokes spirally towards the center with each upper layer penetrated 1". -Top Layer must be above the mold before rodding is started. Add additional concrete if the concrete fall below the top edge of the mold to keep an excess of concrete above the top of mold at all times.
- Strike off the surface of the concrete by means of a screeding and rolling motion of the tamping rod. -Raise the mold vertically a distance of 12 inches in 5 + or - 2 seconds by a steady upward lift.
- Measure the slump by determining the vertical difference between the top of the mold and the displace original center of the top surface of the specimen. Report the slump to the nearest one fourth inch.
- If a decided falling away or shearing off of concrete from one side or portion of the mass occurs disregard the test and make a new test on another portion of the sample. -Test should be completed in 2.5 minutes"
"Measure - CORRECT ANSWER A cylindrical container made of steel or other suitable metal.
The capacity of the measure is based on the nominal size of aggregate in the concrete. Capacity Of Measures: 1"agg. - 6L, 2"agg. -14L & 3"agg. - 28L."
"Strike-Off Plate - CORRECT ANSWER A flat rectangular metal plate at least one fourth inch
thick or a glass / acrylic plate 0.5 inch thick with a length and width at least 2 inches greater than the diameter of the measure with which it is to be used."
"ASTM C138 Desity (Unit Weight), Yield & Air Content: Different Methods of Consolidation -
CORRECT ANSWER The Methods of Consolidation are rodding and internal vibration.
-Rod Concretes with a slump greater than 3 inches. -Rod of Vibrate Concrete with a slump of 1 to 3 inches. -Vibrate Concretes with a slump less than 1 inch."
"ASTM C138 Desity (Unit Weight), Yield & Air Content:
Procedure - CORRECT ANSWER Place the concrete in the measure using the scoop. Move the
scoop around the perimeter of the measure opening to ensure an even distribution of the concrete with minimal segregation. Fill the measure in the number of layers required by the consolidation method of either Rodding or Internal Vibration." "ASTM C138 Desity (Unit Weight), Yield & Air Content:
Procedure - Rodding - CORRECT ANSWER Place the concrete in the measure in three layers of
approximately equal volume. Rod each layer with 25 strokes of the tamping rod when nominal 0.5 cubic feet [14L] or smaller measures are used, 50 strokes when nominal 1 cubic feet [28L] measures are used, and one stroke per 3 inch square of surface for larger measures. Rod each layer uniformly with the upper layers pentrate 1 inch and Rod the bottom layer throughout its depth. After each layer is rodded tap the sides of the measure 10 to 15 times with mallet using such force to close voids left by tamping rod and to release any large air bubbles that may have been entrapped. Add final layer to avoid overfilling." "ASTM C138 Desity (Unit Weight), Yield & Air Content:
Procedure - Internal Vibration - CORRECT ANSWER Fill and vibrate the measure in two equal
layers. Place all of the concrete for each layer in the measure before starting vibration of that layer. Insert the vibrator at three different points for each layer. In compacting the bottom layer do not allow the vibrator to rest on or touch the bottom or sides of the measure. In compacting the final layer, the vibrator shall penetrate into the underlying layer approximately 1 inch. Take care that the vibrator is withdrawn in such a manner that no air pockets are left in the specimen. The duration of vibration required will depend upon the work-ability of the concrete and effectiveness of the vibrator. Continue vibration only long enough to achieve proper consolidation of the concrete. Observe a constant duration of vibration for the particular kind of concrete, vibrator, and measure involved." "ASTM C138 Desity (Unit Weight), Yield & Air Content:
Excess or Deficiency of Concrete - CORRECT ANSWER On completion of consolidation the
measure must not contain a substantial excess or deficiency of concrete. An excess of concrete protruding approximately one eighth of an inch above the top of the mold is optimum. A small quantity of concrete may be added to correct a deficiency. If the measure contains a great excess of concrete at completion of consolidation, remove a representative portion of the excess concrete with a trowel or scoop immediately following completion of consolidation and before the measure is struck-off." "ASTM C138 Desity (Unit Weight), Yield & Air Content:
Strike-Off - CORRECT ANSWER After consolidation, Strike-off the measure by pressing the
strike-off plate on the top surface of the measure to cover about two thirds of the surface and
Note: If Ry is greater than 1.00 indicates an excess of concrete being produced whereas a value less than 1.00 indicates the batch to be "Short" of its designed volume." "ASTM C138 Desity (Unit Weight), Yield & Air Content:
Air Content - CORRECT ANSWER Air = [ (T - D) ÷ T ] X 100
T - Theoretical Density of the Concrete computed on an airfree basis, (lb/ft^3). [ T = M / V ]. The Total Mass of All Materials Batched (M) Divided by The Total Absolute Volume of the Components Ingredients In The Batch (V). Absolute Volume (V) is computed by the weight of material divided by the specific gravity of material multiplied by unit weight of water (62.4). Example, The absolute volume of a 90-lb sample of the aggregate is: 90-lb ÷ (2.65 (SG) x 62.4 lb/cu ft) = 0.544 cu ft. T (theoretical density) = 3944 lb (M) ÷ 26.33 ft^3 = 150.36 lb/ft^ D Measured Density (Unit Weight) = 143. A (Air Content) = [(T - D) ÷ T] x 100 A = [(150.36 - 143.75) ÷ 150.36] x 100 = 4.4%"
"Strike-Off Bar - CORRECT ANSWER A flat straight bar of steel or other suitable metal at least
one eighth inch thick (1/8") and three quarters inch wide (3/4") by 12 inches long." "ASTM C231 Standard Test Method For Air Content by the Pressure Method: Procedure - Type B
Meter - CORRECT ANSWER - Dampen measuring bowl
- Place concrete in Measuring bowel evenly in 3 layers if rodding or 2 layers if vibrating. -Consolidate each layer by rodding (25 times) / tapping with mallet 10-15 times or Vibration by 3 insertions distributed over the cross section. -Strike-Off after consolidation with strike-off bar or plate. -Clean the flanges or rims of the measuring bowl and the cover assembly. -Close the main air valve between the air chamber and the measuring bowl and open both petcocks on the holes through the cover. -Using a rubber syringe, inject water through one petcock until water emerges fro the opposite petcock. Jar the meter gently until all air is expelled from this petcock.
- Close the air bleeder valve on the air chamber and pump air into the air chamber until the gauge hand is on the initial pressure line. Allow a few seconds for the compressed air to cool to normal temperature." “The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete. - CORRECT ANSWER 3 in. [75 mm]"
"The temperature measuring device shall have a capacity of measuring temperature of freshly
mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. - CORRECT
ANSWER 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]"
"The temperature measuring device shall be calibrated _____, or whenever there is a question of
_____. - CORRECT ANSWER Annually, accuracy"
"The temperature of concrete may be measured in a wheelbarrow. True or False? - CORRECT
ANSWER True"
"According to ASTM C1064, what is one reason to take the temperature of concrete? - CORRECT
ANSWER Verify conformance to a specified requirement for temperature of concrete"
"A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False? -
CORRECT ANSWER False"
"The sample of concrete used for temperature determination must be rodded 25 times. True or
False? - CORRECT ANSWER False"
"Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - CORRECT ANSWER Compliance"
"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. - CORRECT ANSWER 5"
"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. - CORRECT
ANSWER 2"
"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? - CORRECT ANSWER False"
"The interior surface of the slump mold is allowed to have minor irregularities. True or False? -
CORRECT ANSWER False"
"For use in the slump test, the end or both ends of the tamping rod must be _____. - CORRECT
ANSWER Rounded to a hemispherical tip"
"How deep should the tamping rod penetrate into each layer? - 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]"
