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ACI Test Exam With 100% Correct Answers 2023-2024, Exams of Advanced Education

ACI Test Exam With 100% Correct Answers 2023-2024 The total time allowed between obtaining the first and final portions of a composite sample is - Correct Answer-15 minutes When it is necessary to wet sieve the concrete sample, wet sieving should be performed after the individual samples are remixed into a composite sample (T or F) - Correct Answer-F Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the composite sample - Correct Answer-5 minutes Begin molding test specimens within ______ minutes after obtaining the composite sample - Correct Answer-15 minutes The concrete samples should be protected from - Correct Answer-the sun, wind, and other sources of rapid evaporation, from contamination When test specimens are to be molded, the minimum size of sample obtained is - Correct Answer-28 L (1 ft^3)

Typology: Exams

2023/2024

Available from 08/21/2024

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ACI Test Exam With 100% Correct

Answers 2023-

The total time allowed between obtaining the first and final portions of a composite sample is - Correct Answer-15 minutes When it is necessary to wet sieve the concrete sample, wet sieving should be performed after the individual samples are remixed into a composite sample (T or F) - Correct Answer-F Tests for slump, temperature, and air content must begin within ______ minutes after obtaining the composite sample - Correct Answer-5 minutes Begin molding test specimens within ______ minutes after obtaining the composite sample - Correct Answer-15 minutes The concrete samples should be protected from - Correct Answer-the sun, wind, and other sources of rapid evaporation, from contamination When test specimens are to be molded, the minimum size of sample obtained is - Correct Answer-28 L (1 ft^3) The primary objective of the sampling process is to obtain a representative sample (T or F) - Correct Answer-T When sampling from a revolving drum truck mixer collect concrete from ______ portions of the batch - Correct Answer-2 or more Wet sieving is performed - Correct Answer-when the concrete contains aggregates larger than appropriate for a test When sampling from a paving mixer it is not acceptable to place 3 small containers on the sub grade in order to obtain the required samples of concrete (T or F) - Correct Answer-F TEMPERATURE - Correct Answer- it may require up to ___ min before the temp stabilizes when the NMS of the coarse agg is greater than ___ - Correct Answer-20min., 3in. The container for the concrete shall be large enough to provide at least ___ inches, or _____ of coarse agg, of concrete in all directions around the TMD - Correct Answer- 3in., 3 x NMS

The temperature measuring device shall have the capability of measuring the temperature of the freshly mixed concrete to ± ______ oF accuracy and have a range of ______ to ______ oF. - Correct Answer-1,30to A composite sample of concrete is not required even if the only purpose for obtaining the sample is to determine temperature. T or F - Correct Answer-T The Temperature Measuring Device used for determining concrete temperature must be calibrated ______ or whenever there is a question of accuracy. - Correct Answer- annually The temperature of freshly mixed concrete can be measured in - Correct Answer-all of the above Submerge the sensing portion of the thermometer at least ______ inches into the concrete - Correct Answer- Gently press concrete around the thermometer such that the_______ does not affect the reading. - Correct Answer-ambient air temp The thermometer must remain in the concrete during the measurement for a minimum of ______ minutes. In addition, the temperature measurement must be completed within _______ minutes after obtaining the sample. - Correct Answer-2, 5 The temperature of freshly mixed concrete is measured and recorded to the nearest _____ - Correct Answer-1 degree SLUMP TEST - Correct Answer- ****The slump test does not provide an indication of the water content of a concrete mixture. - Correct Answer-F A slump mold can be fabricated from both plastic and metal. - Correct Answer-T ****The length of the tamping for the slump test shall be approximately - Correct Answer- The slump test is applicable to concrete having a coarse aggregate up to _______ inch in size. - Correct Answer-1.5 inches The height of the slump cone is - Correct Answer-12 in

  1. The exterior of the slump cone is tapped 10 to 15 times after rodding each layer. - Correct Answer-F The slump mold is filled with three layers of concrete - Correct Answer-by volume
  1. If the top surface of the concrete falls below the top of the slump cone while rodding the final layer of concrete, - Correct Answer-stop, add concrete to maintain an excess, then continue the rod count from where you left off. Raise the mold vertically a distance of 12 inches - Correct Answer-in5±2seconds The slump of a mixture is found by - Correct Answer-measuring the vertical distance to the displaced original center on the top surface of the slumped concrete. AIR CONTENT BY PRESSURE METHOD - Correct Answer- It is allowable to use the Air Content by Pressure Method test to measure the air content of fresh concrete made with - Correct Answer-dense aggregates only Assuming an appropriately sized coarse aggregate, it is not allowable to use the bowl of the pressure meter to determine the density of the concrete per ASTM C138. - Correct Answer-F When the coarse aggregate of a concrete mixture can be retained on a 2in. sieve, wet sieve a sufficient amount of material for the air content test (ASTM C 231) over a ______ sieve - Correct Answer-1.5 in Proper consolidation of concrete in the bowl of the pressure meter is accomplished by - Correct Answer-either rodding or vibration depending on the slump of the concrete Strike off the top surface of the concrete by using - Correct Answer-either strike off bar or plate The length of the tamping rod for the air pressure test shall not be less than - Correct Answer-16 in
  2. Assume that the reading from the dial gage is 5.5% and the aggregate correction factor for the concrete mixture is 0.5%. The final air content for this mixture is - Correct Answer-5.5 - 0.5% = 5.0% After completion of the air test - Correct Answer-a. release the pressure in the bowl by opening the petcocks. AIR CONTENT BY ROLL A METER - Correct Answer- It is permissible to use the Volumetric Method to determine the air content of fresh concrete made with - Correct Answer-lightweight aggregates only
  1. The volumetric method measures the volume of air present within - Correct Answer- the paste fraction only
  2. The purpose for adding isopropyl alcohol to the volumetric meter is to - Correct Answer-help dissolve the foam that can be created during the test
  3. Wet sieve a sufficient amount of material for the volumetric air content test over a ______ in. sieve when the coarse aggregate for the mixture can be retained on a 1.5in. sieve. - Correct Answer-
  4. The bowl of the volumetric meter is filled in ______ layers of equal depth. - Correct Answer-
  5. The excess concrete above the rim of the bowl is struck off using - Correct Answer- strike off bar
  6. Prior to adding any isopropyl alcohol to the meter, it is necessary to add at least ____ of water. - Correct Answer-1 pint
  7. The meter should be inverted and agitated for at least - Correct Answer-45 sec . The rolling process should be continued for a minimum of - Correct Answer-1min
  8. The liquid level in the neck of the meter is stabilized when - Correct Answer-the liquid level does not change more than 0.25% within a 2 minute period
  9. Whenever a reading of the liquid level is taken, the reading is rounded to the nearest - Correct Answer-0.25%
  10. If the foam in the neck of the meter is equivalent to ______ percent air content divisions, or more, the sample must be discarded and test rerun. - Correct Answer- Confirmation of the initial meter reading is obtained when the difference between the initial and final meter readings are within ________ of each other. - Correct Answer- 0.25% If the concrete found in the bottom of the bowl is found to be undisturbed and tightly packed, adhering to the bowl of the volumetric meter when emptied, - Correct Answer-b. the test is invalid and the sample should be discarded. The final meter reading from the neck is found to be 5.5%. Three pints of alcohol were added with the water, given a correction factor of 0.3. The final air content for this test is________. - Correct Answer-. 5.5 - 0.3 = 5.2, rounded to 5.25%. UNIT WEIGHT YIELD AND AIR CONTENT - Correct Answer-

The size of the measure used in determining the density of fresh concrete _______. - Correct Answer-c. is based on the nominal maximum size aggregate ****. It is not allowable to use the bowl from the volumetric air meter test to determine the density of fresh concrete, when the NMAS is 1 inch or less. - Correct Answer-

  1. The appropriate method of consolidation, when the slump of the fresh concrete is less than 1 inch, is to use _______. - Correct Answer-a vibrator
  2. The rod should __________________________when rodding the second and third layers of concrete in the measure. - Correct Answer-c. penetrate the underlying layer about 1 inch. When a vibrator is used to consolidate the concrete in the measure, fill the measure in ______ equal layers. - Correct Answer-
  3. After completing the consolidation portion of the test, it is optimal to have approximately 1/8 inch of excess concrete above the rim of the measure. - Correct Answer-T It is allowable to add a small quantity of concrete to the measure to correct a deficiency.
  • Correct Answer-T
  1. To insure that the measure is completely full with concrete and the surface is level, strike off the top surface of concrete using ________. - Correct Answer-only strike off plate In order to determine the density of fresh concrete, it is necessary to determine __________. - Correct Answer-the weight and volume of the filled measure as well as the weight of the empty measure. Yield represents the ________. - Correct Answer-d. volume of concrete produced per batch MAKING AND CURING CONCRETE - Correct Answer-
  2. The standard sized flexural strength specimen has cross-sectional dimensions of - Correct Answer-6in. x 6in
  3. The standard sized compressive cylinder and flexural beam molds are used for concrete with nominal maximum sized coarse aggregate up to _________. - Correct Answer-2 in

A flexural beam is filled in ______ layer(s) of approximately equal depth. - Correct Answer- ACI Field Testing Technicians, Grade I or equivalent certification is not required is required when testing for slump, air content, and density, but not for making test specimens.. - Correct Answer-F When test specimens are to be molded, it is not necessary to determine the slump, air content, and temperature of fresh concrete. - Correct Answer-F

  1. Single-use cylinder molds that are susceptible to damage when tapped with a rubber mallet should instead by tapped 10 to 15 times with - Correct Answer-with an open hand
  2. Concrete test specimens with a specified compressive strength less than 6,000psi, should be initially cured in a temperature range from - Correct Answer-60 to 80 Initial curing must continue for a period - Correct Answer-up to 48 hours Test specimens shall not be transported until at least ______ hours after initial set has occurred. - Correct Answer- ****Specimens made for determining when a structure can be placed in service shall be removed from their molds at the same time the formwork is removed. - Correct Answer- T
  3. The concrete used to mold test specimens should not be sampled before any on- site adjustments in water or admixtures are made. - Correct Answer-T
  4. Specimens cured following field curing requirements may be used - Correct Answer- to determine the density of fresh concrete The diameter of a cylinder mold shall be at least _______ times the nominal maximum size of the coarse aggregate used in the concrete mixture. - Correct Answer-
  5. When vibration is used to consolidate concrete in a standard cylinder mold, ___________ layers of concrete in the mold should be used. - Correct Answer- When vibration is used to consolidate concrete in a standard cylinder mold, the number of insertions of the vibrator per layer of concrete should be used. - Correct Answer-