American Concrete Institute (ACI) Practice Exam

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• Is it necessary to tap the sides of the bowl after each layer has been rodded? true or false?
• The sample of concrete for slump testing must be obtained in accordance with which ASTM standard?
• How long must the temperature sensor remain in the freshly mixed concrete?
• What is the maximum outside diameter of the vibrating element in millimeters?
• Submerged depth for the temperature sensor in freshly mixed concrete should be at least how many inches?
• Which of the following is NOT a mixer type listed for sampling?
• The maximum size aggregate allowed in this test method?
• The pressure method cannot be used on concrete containing which of the following aggregate types?
• Before filling, the slump mold should be kept in which condition?
• 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?
• If the concrete contains aggregate larger than the maximum allowed for this test, the sample must be ______.
• For rodding consolidation, the mold should be filled in how many layers?
• After final set, how many hours must pass before transporting the specimens?
• The measurement for slump is made from the top of the mold to what point of the concrete specimen?
• When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _____.
• What is the approximate volume of the measuring cup used to add water to the air meter, in relation to the volume of the air meter bowl?
• The surface on which the slump mold is placed must be which of the following?
• Prior to lifting the slump mold, concrete must be removed from which part?
• The slump mold should be in a dry condition before beginning the test.
• The minimum thickness of a glass or acrylic strike-off plate is 0.50 inches. True or False?
• A slump reading is rounded to the nearest which value?
• When rodding the bottom layer, the tamping rod must be placed to uniformly distribute the strokes?
• Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample.
• Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have an initial curing temperature between __________.
• After submerging the device, how should the surrounding concrete be placed around the device?
• What is the height of the slump mold?
• Can a plastic container be used for the measure in this slump test method?
• What is the minimum allowable capacity of the measuring bowl used in this test method?
• Is the statement 'The tamping rod penetrates about 2 inches into each layer' correct?
• What is the maximum allowed transportation time for test specimens?
• 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.
• True or False: If less than 2.5 pints of alcohol are used, the air content is always indicated by the final meter reading.
• 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 _____.
• When filling the bowl of the air meter, the concrete must be placed in ___ layers of equal depth.
• What is the minimum outside diameter of the vibrating element in inches?
• Tests that must begin within a limited time after fabricating the composite sample include which of the following?
• When internal vibration is used to consolidate a standard flexural strength test specimen, the technician should insert the vibrator at intervals not exceeding _____ along the center line of the beam.
• At the end of the procedure, what is the state of the air meter?
• When rodding the middle and top layers, the tamping rod should penetrate into the layer below approximately _____?
• If portions of undisturbed concrete are found in the air meter at the end of the test, what should be done?
• Which solvent concentration by weight is specified for the alcohol used in this test method?
• Air meter bowls used for this test must conform to which ASTM standard and be calibrated for volume according to which ASTM standard?
• What is the required shape and material for the tamping rod used for cylinders of 6 in diameter or greater?
• The approximate depth after placing the first layer is which value?
• After the final rodding, the sides of the slump mold should be tapped lightly with the tamping rod. True or False?
• The depth of the second layer is approximately which value?
• The concrete sample must be protected from contamination and _____.
• If the concrete drops below the top of the slump mold during rodding the top layer, what should be done?
• Which standard is used for determining the temperature of concrete in field sampling?
• If the air content exceeds the 9 percent range of the meter, what action should be taken?
• After rodding each layer, what should be done to the measure before adding another layer of concrete?
• The temperature measuring device shall have a capacity to measure temperature of freshly mixed concrete with which resolution and range?
• How many strokes are required per layer when rodding the sample?
• How much time is allowed to conduct the slump test from beginning to completion?
• The composite sample from a truck mixer is taken from which portion of the batch?
• The volumetric method of determining air content of concrete can be used on concrete containing which types of aggregate?
• If the concrete is to be consolidated by vibration, a standard 4x8 inch [100 mm by 200 mm] cylinder mold must be filled in how many equal layers?
• Field curing is used to assess which aspect of concrete?
• A standard test cylinder used for compressive strength testing has which nominal dimensions?
• If vibration is the method of consolidation, the measure must be filled in approximately equal layers.
• According to ASTM C1064, what is one reason to take the temperature of concrete?
• The slump test maximum aggregate size for plastic concrete is 1.5 inches (37.5 mm). Which option matches this value?
• Which action is not a designated method of consolidation for this procedure?
• Calibration frequency for the temperature measuring device is best described as which?
• What preparation must be done to the sample container prior to sampling?
• A paving mixer composite sample must represent a minimum of how many portions of the batch after discharge?
• Vibration of the concrete sample is not allowed when the slump of concrete exceeds _____.
• After reading the temperature, what is required?
• The sample of concrete used for temperature determination must be rodded 25 times. True or False?
• Which of the following describes standard curing?
• The temperature of concrete is reported to the nearest degree Fahrenheit.
• When should serviceability cylinders be removed from the mold?
• Standard curing is the curing method used when test specimens are to be used for ______.
• Is measuring the temperature in a wall form permitted?
• Sampling by this method is required when tests are to be made to determine _____ with specification requirements.
• What is the volume of the mold used for sampling in cubic feet?
• ASTM Method gives standardized requirements for _____, _____, _____, and _____, of test specimens.
• Which action is not a step in the slump test procedure?
• If the slump is less than 1 inch, which consolidation method must be used?
• When consolidating a flexural strength test specimen by rodding, rod one stroke for each _____ of top surface area.
• When using an internal vibrator to consolidate a 6 by 12 in. compressive strength test specimen, the vibrator must be inserted at _____ different points for each layer.
• When rodding a standard 6 by 12 in cylinder, each layer must be rodded _____ times.
• This method covers sampling from four types of mixtures which are _____, _____, _____, and _____.
• Which statement is true about the consolidation methods described?
• Before weighing, the surface of the sample mold must be prepared by which action?
• The 6 by 12 inch cylinder mold corresponds to what metric dimensions?
• What tools may be used to strike off the top surface of the concrete following consolidation of the final layer?
• What is the maximum allowed transportation time for test specimens, in hours?
• The temperature and moisture environment for field cured cylinders must be __________.
• The total agitation time must be at least how many seconds?
• The 9% range refers to what aspect of the meter?
• Which statement about the interior surface of the slump mold is correct?
• When aggregate larger than permitted for a test method, the sample must be subjected to which processing step before the test?
• When large amounts of alcohol are used, the direct reading will tend to indicate which of the following about the air content?
• What is the consequence of finding portions of undisturbed concrete in the air meter at the end of the test?
• The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch taken from the pile after discharge.
• Which statement is true about the slump test procedure?
• 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?
• Specimens shall not be transported until ______ hours after final set.
• In the slump test, how many roddings are prescribed per layer?
• Measures other than air meter bowls used for this test must conform to which ASTM standard?
• Which statement is true regarding the maximum aggregate size for this method?
• When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be _____ before making the test.
• After completing the strike-off procedure, what must be done before weighing the measure and sample?
• Each layer should fill approximately what fraction of the mold's volume?
• When raising the slump mold, should it be rotated or twisted?
• During transportation, test specimens must be protected from damage due to ____,____, and ____.
• Upon completion of initial curing, the test specimens may be left in their molds and sealed in plastic bags. true or false?
• The composite samples from a truck mixer must be obtained from what portion of the batch?
• When rodding the concrete sample, what is the specified number of strokes required for each layer?
• The slump test is applicable to plastic concrete with a maximum size aggregate of what?
• In field curing, test results are compared to which standard?
• After molding test specimens, you should wait two hours before moving them to the location of initial storage. True or False?
• What is the required minimum frequency of the vibrator used in this slump test method?
• The standard 4x8 inch cylinder mold is used specifically for which consolidation method?
• Is measuring the temperature in a wheelbarrow permitted?
• In consolidating the concrete by vibration, how many times should the vibrator be inserted into each layer?
• When more than 2.5 pints of alcohol are used, the final meter reading is adjusted using which factor?
• The initial curing temperature range for high-strength concrete (6000 psi or greater) is within which range?
• What is the minimum thickness for a glass or acrylic strike-off plate?
• The pressure method for determining air content can be used in concrete containing which aggregate?
• What is the Fahrenheit temperature range for the device?
• Tamping rod penetration into each layer should be approximately how deep?
• During transportation, which of the following is the proper way to protect specimens?
• The minimum size sample for making strength test specimens is _____.
• Up to 48 hours after molding, test specimens that are to be standard cured shall be stored in a temperature range between _____ to _____.
• If the concrete sample is to be consolidated by vibration, the measure is filled in _____ layers.
• Which statements are required for the initial meter reading to be considered valid?
• Is a composite sample required if the sole purpose is to determine temperature?
• Which tool is used to remove excess concrete from above the mold after final consolidation?
• Vibration is not allowed when the slump exceeds which value?
• What type of alcohol and concentration must be used in this test method?
• Which statement is true about standard curing and field curing in terms of comparison of results?
• The slump mold is filled in how many layers?
• For a measure of 0.5 ft^3, how many strokes of the tamping rod are required for consolidation of each layer?
• What is the maximum size aggregate allowed for this test method?
• 0.25 inches is approximately equal to how many millimeters?
• The maximum duration of a single inversion is how many seconds?
• Which option correctly pairs the first and second layer depths?
• During the air meter procedure, how long is an individual inversion limited to, and what is the minimum total agitation time?
• What is the Celsius temperature range for the device?
• If, after consolidation of the final layer, the concrete level is 1/2 in. above the top of the measure, what should be done?
• For concrete with a slump of less than 1 in. [25 mm], the test specimens must be consolidated by what method?
• After rodding a layer, what action is recommended before adding the next layer?
• Which of the following is not listed as an eligible aggregate type for the volumetric air content method?
• The volumetric method of determining air content can be used on concrete containing which aggregate types?
• The 6 by 12 in cylinder mold mentioned has metric dimensions of what?
• Which statement correctly describes stationary mixer sampling?
• The final meter reading is reported to what precision?
• When consolidating a 6x12 cylinder using internal vibration, how many insertion points per layer are required?
• The maximum allowable time between obtaining the first and final portion of a composite sample is how many minutes?
• Which statement is true about the reference point for slump measurement?
• When strength specimens are to be made, they must be tested for what properties?
• The supporting surface on which specimens are stored shall be level within what tolerance?
• Which statement about the final portion timing is correct?
• Which statement best describes the purpose of the strike-off tool in finishing concrete after consolidation?
• Where is the final reading taken on the air meter?
• For the slump test, the ends of the tamping rod must be which shape?
• The molding strength of test specimens shall begin within ____ minutes after fabricating the composite sample.
• Which curing method is used to determine whether a structure may be put into service?
• If the concrete slump is greater than 3 inches, which consolidation method must be used?
• What is the diameter of the tamping rod used in the slump test?
• 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.
• How much time is allowed for lifting the slump mold?
• How many rolling operations are performed in the procedure?
• After reading the temperature, which statement best reflects the required action?
• What is the minimum thickness of a metal strike-off plate?
• To what precision is the final liquid level in the neck of the air meter read?
• The measuring bowl capacity minimum is specified as at least:
• Which ASTM standard governs the sampling of fresh concrete for test specimens?
• What is the specified weight of the mallet used on measures that are 0.5 ft3 [14 L] or smaller?
• The minimum submersion depth corresponds to approximately how many millimeters?
• Which option lists the correct second-layer depth?
• Field curing is the curing method used when test specimens are to be used for __________.
• The slump is measured and reported to the nearest how many inches?
• Which of the following options correctly identifies mixer types included in the sampling method?
• Which statement best describes the maximum aggregate size allowed for this test method?
• Which purpose does the isopropyl alcohol serve in the meter procedure?
• 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.
• When rodding each upper layer of concrete in a cylinder, the tamping rod should penetrate into the underlying layer by about _____.
• What are the minimum and maximum outside diameters of the vibrating element?
• Cylinders made for the purpose of determining when a structure may be put into service shall be removed from the mold __________.
• Upon filling of the air meter with water, what part of the liquid level should be adjusted to the zero mark on the meter?
• If the concrete sample is to be consolidated by rodding, the measure is filled in _____ layers.
• Which duration is correct for the device to remain in the concrete?
• The slump test mold is shaped like which geometric form?
• Which statement is true about the environment for field-cured cylinders?
• 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.
• Standard curing is used for test specimens intended for which purposes?
• The field curing environment for cylinders must be...
• Which value represents the approximate depth after placing the first layer?
• The minimum frequency of an internal vibrator used in this procedure is _____.
• A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False?
• After consolidation of the final layer, an excess of concrete ____ above the top of the measure is considered optimum.