ACI Testing Guidelines and Procedures, Exams of Construction

Download ACI Testing Guidelines and Procedures and more Exams Construction in PDF only on Docsity! ACI Test with Real Questions and 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