Download ACI Test Guidelines and Procedures and more Exams Construction in PDF only on Docsity! ACI Test with Real Questions and Correct Answers. Already Graded A+. . The rolling process should be continued for a minimum of - ANS1min ****. 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. - ANS ****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. - ANST ****The length of the tamping for the slump test shall be approximately - ANS ****The slump test does not provide an indication of the water content of a concrete mixture. - ANSF 1. The standard sized flexural strength specimen has cross-sectional dimensions of - ANS6in. x 6in 10. The liquid level in the neck of the meter is stabilized when - ANSthe liquid level does not change more than 0.25% within a 2 minute period 11. The concrete used to mold test specimens should not be sampled before any on- site adjustments in water or admixtures are made. - ANST 11. Whenever a reading of the liquid level is taken, the reading is rounded to the nearest - ANS0.25% 12. 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. - ANS2 12. Specimens cured following field curing requirements may be used - ANSto determine the density of fresh concrete 14. When vibration is used to consolidate concrete in a standard cylinder mold, ___________ layers of concrete in the mold should be used. - ANS2 2. The standard sized compressive cylinder and flexural beam molds are used for concrete with nominal maximum sized coarse aggregate up to _________. - ANS2 in 2. The volumetric method measures the volume of air present within - ANSthe paste fraction only 3. The appropriate method of consolidation, when the slump of the fresh concrete is less than 1 inch, is to use _______. - ANSa vibrator 3. The purpose for adding isopropyl alcohol to the volumetric meter is to - ANShelp dissolve the foam that can be created during the test 4. The rod should __________________________when rodding the second and third layers of concrete in the measure. - ANSc. penetrate the underlying layer about 1 inch. 4. 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. - ANS1 5. The bowl of the volumetric meter is filled in ______ layers of equal depth. - ANS2 6. 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. - ANST 6. Single-use cylinder molds that are susceptible to damage when tapped with a rubber mallet should instead by tapped 10 to 15 times with - ANSwith an open hand 6. The excess concrete above the rim of the bowl is struck off using - ANSstrike off bar 6. The exterior of the slump cone is tapped 10 to 15 times after rodding each layer. - ANSF 7. 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 - ANS5.5 - 0.5% = 5.0% 7. Concrete test specimens with a specified compressive strength less than 6,000psi, should be initially cured in a temperature range from - ANS60 to 80 7. Prior to adding any isopropyl alcohol to the meter, it is necessary to add at least ____ of water. - ANS1 pint 8. If the top surface of the concrete falls below the top of the slump cone while rodding the final layer of concrete, - ANSstop, add concrete to maintain an excess, then continue the rod count from where you left off. 8. The meter should be inverted and agitated for at least - ANS45 sec 8. To insure that the measure is completely full with concrete and the surface is level, strike off the top surface of concrete using ________. - ANSonly strike off plate The primary objective of the sampling process is to obtain a representative sample (T or F) - ANST The size of the measure used in determining the density of fresh concrete _______. - ANSc. is based on the nominal maximum size aggregate The slump mold is filled with three layers of concrete - ANSby volume The slump of a mixture is found by - ANSmeasuring the vertical distance to the displaced original center on the top surface of the slumped concrete. The slump test is applicable to concrete having a coarse aggregate up to _______ inch in size. - ANS1.5 inches 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. - ANS1,30to120 The Temperature Measuring Device used for determining concrete temperature must be calibrated ______ or whenever there is a question of accuracy. - ANSannually The temperature of freshly mixed concrete can be measured in - ANSall of the above The temperature of freshly mixed concrete is measured and recorded to the nearest _____ - ANS1 degree 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. - ANS2, 5 The total time allowed between obtaining the first and final portions of a composite sample is - ANS15 minutes UNIT WEIGHT YIELD AND AIR CONTENT - ANS Wet sieving is performed - ANSwhen the concrete contains aggregates larger than appropriate for a test When a vibrator is used to consolidate the concrete in the measure, fill the measure in ______ equal layers. - ANS2 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) - ANSF 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) - ANSF When sampling from a revolving drum truck mixer collect concrete from ______ portions of the batch - ANS2 or more When test specimens are to be molded, it is not necessary to determine the slump, air content, and temperature of fresh concrete. - ANSF When test specimens are to be molded, the minimum size of sample obtained is - ANS28 L (1 ft^3) 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 - ANS1.5 in 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. - ANS2 Yield represents the ________. - ANSd. volume of concrete produced per batch