ACI Concrete Written Exam @ 2024

ACI Concrete Written Exam @ 2024 Collecting a representative sample of concrete to be tested is as important as exec uting the test methods to obtain BLANK - Answer Accurate Results This practice covers sampling from four types of equipment, which are: BLANK, BLANK,BLANK, and BLANK - Answer Stationary Mixers, Paving Mixers, R evolving Truck Mixers, Continuous Mixers The Elapsed time between obtaining the first and final portions of a composite sample shall not exceed BLANK - Answer 15 minutes Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. True or False? - Answer True Start the tests for slump, temperature, and air content within BLANK after obtaining the final portion of the composite sample? - Answer 5 Minutes Start molding specimens for strength tests within BLANK after fabricating the compos ite sample? - Answer 15 Minutes The concrete sample must be protected from contamination and BLA NK - Answer Evaporation The minimum size sample for making strength test specimens is BLANK - Answer 1 Cubic ft or 28 litres When sampling from a stationary mixer, the batch must be sampled at BLANK or more regularly spaced intervals during discharge of the middle portion of the batch - Answer 2 When sampling from a paving mixer, obtain samples from at least BLANK different portions of the pile and combine them into one composite sample for test purposes - Answer 5 When sampling from a revolving truck mixer, sample the concrete by collecting BLANK or more portions taken at regularly spaced intervals during discharge of the middle portion of this batch. - Answer 2 Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. True or False? - Answer False When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be BLANK before making the test. - Answer We t Screened The stem of the thermometer is submerged a minimum of BLANK into the freshly mi xed concrete. - Answer 3 Inches (75 mm) The thermometer shall be capable of accurately measuring the temperature of freshly mixed concrete to BLANK throughout a range of BLANK - Answer 1 Deg. Fahrenheit (+/- 0.5 C), 30 to 120 Deg. Fahrenheit (0-50 C) The thermometer shall be verified within BLANK - Answer At least 1 year of current use The temperature of concrete may be measured in the wheelbarrow. True of False? - Answer True The temperature of concrete may be measured in a wall form. True or False? - Answer True A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True or False? - Answer False What must be done to the sample container prior to sampling the concrete? - Answer Dampened (With water) What must be done to the concrete surrounding the thermometer after the device is submerged in the fresh concrete? - Answer Push concrete around the stem to ensure the concrete is in full contact with the stem. How long must the thermometer remain in the freshly mixed concrete? - Answer 2- 5 minutes After the temperature of the concrete is read, what is then required? - Answer Reco rd the temperature