ACI written exam questions and answers

ACI written exam questions and answers False. Relatively dense - Answer- The method of determining air content of concrete containing lightweight aggregate is the pressure method True - Answer- 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. Disregard the test and retest on another portion of the sample. - Answer- 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? Determination that at least 8 hours has elapsed since final set. - Answer- Preparation of specimens for transport includes: 4.8% - Answer- 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? Protected from jarring, moisture loss, and freezing - Answer- Strength test specimens transported from the field to the testing laboratory must be: 5 MInutes - Answer- Tests for slump and air content must be started within ________ after obtaining the final portion of the composite sample. 1 cubic foot - Answer- The minimum size for samples to be used for strength test is: