ACI Certification Practice Exam

A tamping rod, flow, or trowel can be used to produce a smooth flat level surface on top of the cylinders - answer-Tamping rod, flow, trowel, all the above All of the above is correct When a strength specimen is used for acceptance testing, quality control testing, or trial batching a mix design, which type of curing method should be used - answer-Standard lab cure when a strength specimen is used to determine when a structure can be put in the service or when shoring can be removed, which type of curing should be used? - answer-Field cure Which three tests must always be performed when making test specimens? - answer-Temperature, slump, air content Concrete should cover________ inches around the temperature sensor? - answer-3 When inserting the sensor into the sample, gently press concrete around the sensor. - answer-True The temperature reading must be complete between _______ and ______ minutes - answer-2 and 5 Read the temperature measurement to the nearest ______ Fahrenheit - answer-1 degree The temperature sensor should be removed when reading it? - answer-False The temperature measuring device shall be calibrated _________or whenever there is a question of_____________ - answer--Annually -Correctness or accuracy The temperature device should be accurate to the nearest_______ fahrenheit and have a range of _____farenhite to _______ fahrenheit. - answer-1 30 120 The maximum allowable sampling time between attaining the first and final portions of a composite sample is ____________ - answer-15 minutes Concrete samples must be obtained before any water or admixtures are added to the mixer at the job site - answer-False When sampling from a paving mixer, obtain samples from at least ________ different portions of the pile and combined them into one composite sample for test purposes - answer-5 When sampling from a revolving drum truck, how many portions should be collected? - answer-Two or more Samples for strength should be taken before 10% or after 90% of the batch has been discharged in a revolving drum track? - answer-False The concrete sample must be protected from contamination and _____________ - answer-Rapid evaporation Portions for a composite shall be combined and thoroughly remixed before beginning test on the sample - answer-True While a minimum of 1 ft.³ is required for strength testing, smaller samples than 1 ft.³ are allowed on routine air