ACI Written Exam Questions & Answers 2024 Edition. Already Graded A+., Exams of Material Engineering

Download ACI Written Exam Questions & Answers 2024 Edition. Already Graded A+. and more Exams Material Engineering in PDF only on Docsity! ACI Written Exam Questions & Answers 2024 Edition. Already Graded A+. 1 cubic foot - ANSThe minimum size for samples to be used for strength test is: 15 minutes - ANSStart molding strength test specimens within _______ after fabricating the composite sample. 3 inches ( 75MM) - ANSWhen determining the temperature of fresh mixed concrete, what is the minimum amount of concrete cover in all directions around the sensor of the temperature measuring device? 4.8% - ANSIf the aggregate correction factor for a given source of fine and coarse aggregate is found to be 0.2% in a pressure air meter, and an air content value of 5.0% is read on the gauge of the same air meter containing concrete with the same aggregate, what is the correct air content? 5 MInutes - ANSTests for slump and air content must be started within ________ after obtaining the final portion of the composite sample. 60 to 80 degrees f (16 to 27 degrees C) - ANSFor normal strength concretes, what temperature range must be maintained for test cylinders during initial curing? Determination that at least 8 hours has elapsed since final set. - ANSPreparation of specimens for transport includes: Disregard the test and retest on another portion of the sample. - ANSWhile the technician is checking the slump of the concrete, there is a decided falling away or shearing off of concrete from one side of the sample. What should the technician do? False - ANSIs the following statement true or false? After strike off of the measure used to determine density, a small quantity of concrete may be added to correct a deficiency. False - ANSIs the following statement true or false? It is acceptable to fabricate a test specimen from the same concrete used for the air contest test. false - ANSIs the following statement true or false? The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. False - ANSIs the following statement true or false? When concrete contains large aggregate, the testing technician should wet-sieved the sample before making density (unit weight) tests for use in yield computations. False. Relatively dense - ANSThe method of determining air content of concrete containing lightweight aggregate is the pressure method Flat, tapered, or pointed - ANSThe tamping rod should not be: Protected from jarring, moisture loss, and freezing - ANSStrength test specimens transported from the field to the testing laboratory must be: True - ANSIs the following statement true or false? Representative samples are required for use in test conducted for the purpose of determining compliance with the specifications for concrete quality. True - ANSIs the following statement true or false? Test cylinders may be capped with a thin layer of portland cement paste which is permitted to harden and cure with the specimen true - ANSIs the following statement true or false? Test method c173/c173m specifies a minimum time requirement for inverting and agitating the meter to free concrete from the base. True - ANSIs the following statement true or false? Unless specified otherwise, strength test specimens molded from concrete having a slump less than 25mm (1 inch) must be consolidated by vibration. True - ANSIs the following statement true or false? When making a test cylinder from concrete being used in construction, the field technician must also measure the slump of the concrete. A) - ANSThe maximum allowable depth of depressions in the ends of cylinders that need not be sawed or ground in: a) 5 mm [0.20 in.] b) 6 mm [0.24 in.] c) 8 mm [0.31 in.] d) 9 mm [0.35 in.] A) - ANSThis test method consists of applying a compressive axial load to molded cylinders or cores at a rate which is within a prescribed range until failure occurs: a) True b) False B) - ANSPractie C1231/C1231M contains step-by-step procedures for aligning the specimens in the testing machine through initial application of the load: a) True b) False B) - ANSThe percent error for loads used in the testing machine should not exceed ___ percent of the indicated load: a) +/- 0.05% b) +/- 1.0% c) +/- 0.5% d) +/- 1.5% e) +/- 2.0% B) - ANSTo determine the average width, depth, and line of fracture location of the specimen, you should take ___ measurements across each dimension: a) 2 b) 3 c) 4 d) 5 C) - ANSThe final report should include both the average width and depth to the nearest: a) 25.4 mm [1 in.] b) 12.7 mm [0.5 in.] c) 1 mm [0.05 in.] d) 6.4 mm [0.25 in.]