ACI written exam Questions With Correct Solutions, Already Passed!!

The method of determining air content of concrete containing lightweight aggregate is the pressure method - False. Relatively dense Is 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. - True While 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? - Disregard the test and retest on another portion of the sample. Preparation of specimens for transport includes: - Determination that at least 8 hours has elapsed since final set. If 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? - 4.8% Strength test specimens transported from the field to the testing laboratory must be: - Protected from jarring, moisture loss, and freezing Tests for slump and air content must be started within ________ after obtaining the final portion of the composite sample. - 5 MInutes The minimum size for samples to be used for strength test is: - 1 cubic foot Is 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 For normal strength concretes, what temperature range must be maintained for test cylinders during initial curing? - 60 to 80 degrees f (16 to 27 degrees C)Is 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 When 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? - 3 inches ( 75MM) Is the following statement true or false? The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. - false Is 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 Is 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 The tamping rod should not be: - Flat, tapered, or pointed Start molding strength test specimens within _______ after fabricating the composite sample. - 15 minutes Is 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 Is 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 Is 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