ACI Certification - Concrete Field Testing Technician - Grade 1 - Test Sample Written Exam Questions - CP-1(17) 100% Correct

ACI Certification - Concrete Field Testing Technician - Grade 1 - Test Sample Written Exam Questions - CP-1(17) 100% Correct The Method of determining air content of concrete containing lightweight aggregate is the pressure method. True or False? False When making a test cylinder from concrete being used in construction, the field technician must also measure the slump of the concrete. True or False? 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 Determining that at least 8 hours has elapsed since the final set If the aggregate correction factor for a given source of fine and coarse aggregate is found to be .2% in a pressure air meter, and an air content value of 5.0% is read on the gage of the same air meter containing concrete with the same aggregate, what is the correct air content in %. 4.8% = 5.0 - 0.2 Strength test specimens transported from the field to the testing laboratory must be Protected from jarring, moisture loss, and freezing. Test for slump and air content must be started within __ after obtaining the final portion of the composite sample. 5 mins The minimum size for samples to be used for strength tests is __. 1 ft^3 = 28 L After strike off of the measure used to determine density, a small quantity of concrete may be added to correct a deficiency. True or False? False For normal strength concretes, what temperature range must be maintained for test cylinders during initial curing? 60-80 deg F When the concrete contains large aggregate, the testing technician should wet-sieve the sample before making density (unit weight) tests for use in yield computations. True or False? False When determining the temperature of fresh concrete, what is the minimum amount of concrete cover in all directions around the sensor of the temperature measuring device? 3 in = 75 mm The sides of the slump mold should be lightly tapped to consolidate the concrete in the mold. True or False? False Unless specified otherwise, strength test specimens molded from concrete having a slump less than 1 in. (25mm) must be consolidated by vibration. True or False? True Test cylinders may be capped with a thin layer of portland cement paste which is permitted to harden and cure with the specimen. True or False? True