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

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ACI Exam Questions With 100% Correct

Answers 2023-

This test method covers sampling from stationary, paving and truck mixers, and from agitating and non agitating equipment used to transport central mixed concrete - Correct Answer-True When the concrete contains large aggregate, the testing technician should wet sieve the sample before making unit weight tests for use in yield computation - Correct Answer- False - cant wet sieve unit weight Samples should be taken before 10% or after 90% of the batch has been discharged. - Correct Answer-False Samples smaller than 28L (1 cu.ft.) are allowed on routine air content, temperature, and slump tests - Correct Answer-True Tests for slump and air content must be started within ___ after obtaining the final portion of the composite sample - Correct Answer-5 minutes Start molding strength test specimens within ___ after fabricating the composite sample

• Correct Answer-15 minutes How do you regulate the rate of discharge of the batch from the revolving truck drum mixer or agitator - Correct Answer-By the rate of revolution of the drum The mold of the shaper of a ___ - Correct Answer-Frustum of a cone The top diameter is ___ and the diameter at the base is __ - Correct Answer-4",8" While the technician is checking the slump of the concrete, there is a decided falling away or shearing off of the 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 The mold is filled in three equal layers by volume, which makes the first third at __ and the second third at ___ - Correct Answer-2 5/8, 6 1/ The maximum size of aggregate allowed for slump test is - Correct Answer-1 1/2" When ridding the second and third layers the rod should penetrate through the layer and into the previous layer ___ - Correct Answer-1"

The slump of the concrete was determined to be 4 5/16 what should be recorded as the slump - Correct Answer-4 1/4 - closest quarter What's is the maximum amount of time to complete the slump test - Correct Answer-2. minutes The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold - Correct Answer-False When ridding the final lift additional concrete must be added to keep excess concrete above the top of the mold at all times - Correct Answer-True ASTM C 1064 defines the maximum recommended temperature for concrete - Correct Answer-False - test standard not a specification standard What temperature test method must be complete within ___ after obtaining the sample - Correct Answer-5 minutes Each temperature measuring device should be calibrated ___ or whenever there is a question of ___ - Correct Answer-Annually, accuracy When determining the temperature of fresh concrete what is the minimum amount of concrete cover in all directions around the sensor of the TMD - Correct Answer-3 inches When the concrete contains a minimal maximum size of aggregate greater than 3 inches it may require ___ before the temperature is stabilized after mixing - Correct Answer-20 minutes After strike off of the measure used to determine density, a small quantity of concrete may be added to correct a deficiency - Correct Answer-True If using any strike off plate the plate must be at least 1 in greater than the diameter of the measure with which it is being used - Correct Answer-False - 2 inches If rodding is the method of consolidation being used, the measure must be filled in how many layers? - Correct Answer-3 layers What is the required shape at the end of the tamping rod - Correct Answer-Rounded to a hemispheric tip After consolidation of the final layer the concrete is 1/2" above the top of the measure what should be done? - Correct Answer-Remove excess concrete with a scoop or trowel According to ASTM C138 what is the density of the following concrete batch - Correct Answer-D= m/v

According to ASTM C 138 what is the yield of the following concrete batch in cubic yards - Correct Answer-Y= m/dx According to ASTM C138 what is the relative yield - Correct Answer-Ry=y/cubic yard According to ASTM C 138 what is the air content - Correct Answer-AC= Dt-Da/Dt The definition of yield can be described as - Correct Answer-The total mass of materials batched divided by the density Test method ASTM C 231 is intended for use with all concretes and aggregates for which an aggregate correction factor can be determined - Correct Answer-False - only normal weight The peacocks are closed before pumping any air into the chamber on the type b meter - Correct Answer-False Rodding of the second and third layers should penetrate the previous layer 1" - Correct Answer-True The sample is obtained in accordance to ASTM C __ - Correct Answer- Correction factor - Correct Answer-Air reading - air correction factor Over vibration of concrete can lead to what - Correct Answer-Both loss of intentionally entrained air and segregation If the sample is vibrated the duration of vibration should last ___________. - Correct Answer-Until the surface concrete is smooth The maximum size aggregate for the test is - Correct Answer-1 1/2" If the aggregate is too large it must be - Correct Answer-Wet sieved over 1 1/2 sieve The minimum size of the measure is - Correct Answer-Dependent upon the nominal maximum coarse aggregate size At the end of the pressure method procedure how is the pressure released from the type b meter - Correct Answer-Opening both petcock ASTM 173 specifies that the bowl is filled 3 lifts - Correct Answer-False - only 2 layers ASTM 173 specifies a minimum time requirement for inverting and agitating the meter to free concrete from the base - Correct Answer-True

ASTM 173 is appropriate for testing concretes containing ightweight aggregates - Correct Answer-True - all aggregates ASTM 173 specifies that at the very end of the test the tester must make sure that there are portions undisturbed in the bottom of the bowl if so the test is valid - Correct Answer-False The maximum size aggregate for this test is - Correct Answer-1 1/2" If the second reading after rolling and rocking differs by more than 0.25% from the first ___ - Correct Answer-Rock and roll the meter again You added 2 pints of alcohol to the roll a meter before you started your final reading after completing the test is 5.5% air what is the recorded air reading - Correct Answer- Final air reading - correction factor + water added When making a test cylinder from concrete being used in construction the field technician must also measure the slump of the concrete - Correct Answer-True Unless otherwise specified strength test specimens molded from the concrete having a slump less than 1" must be consolidated by vibrations - Correct Answer-True Field cured specimens can be used to determine wether a structure is capable of being put into service and can take the place of standard cured specimens - Correct Answer- False - cant take place but can be compared with Preparation of specimens for transport includes - Correct Answer-Determination that at least 8 hours has elapsed since final set Strength test specimens transported from the field to the testing laboratory must be - Correct Answer-All of the above The minimum size sample for making strength test specimens is _____. - Correct Answer-1 cuft For concrete mixtures with a specified strength greater than 6000 psi the initial curing temperature should be - Correct Answer-68- If the specimens are standard cured, the resulting strength test data when the specimens are tested can be used for the following purposes. - Correct Answer-All of the above When the specified strength of concrete is under 6000 psi what temperature should they be stored in for the first 48 hours - Correct Answer-60 - 80