ACI Concrete Field Testing Technician Exam Questions With Correct Answers Latest Updated 2024/2025 | Graded A+

The end of the temperature sensing portion of the temperature measuring device is submerged a minimum of __mm [__in.] into the freshly mixed concrete. Answer - 77mm /3in. The temperature measuring device shall be capable of accurately measuring the temperature of freshly mixed concrete to +- __C [+__F] throught a range of __. Answer - 0.5 C / +-1F / 0-50 Decrees C The temp. measuring device shall be verified __, or whenever there is a question of __. Answer - Annually / accuracy The temp of concrete may be measured in a wheelbarrow? T/F Answer - True The temp. of concrete may be measured in a wall form. T/F Answer - True A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temp. T/F Answer - False What must be done to the sample container prior to sampling the concrete Answer - It must be dampened with water What must be done to the concrete surrounding the temp measuring device after the device is submerged in the fresh concrete? Answer - Gently press the concrete at the surface around the measuring device. How long must the temperature measuring device remain in the freshly mixed concrete? Answer - At least 2 min., no longer than 5 min. ACI Concrete Field Testing Technician Exam Questions With Correct Answers Latest Updated 2024/2025 | Graded A+ After the temperature of the concrete is read, what is then required? Answer - Reporting of temp. The temp. of concrete is reported to the nearest __. Answer - 1 degree F According to ASTM C1064, what is one reason to take the temperature of concrete? Answer - to verify conformance to a specific requirement. A max. temp. of freshly mixed concrete is specified in ASTM C1064. T/F Answer - False The sample of concrete used for temperature determination must be rodded 25 times. Answer - False Sampling by this method covers procedures or obtaining representative samples, on which test are to be performed to determined __ with quality requirements of the specifications under which the concrete is furnished. Answer - Compliance This method covers sampling from four types of mixers, which are __, __, __, and __. Answer - Stationary mixers / Paving mixers / revolving drum mixers / open top mixers The elapsed time between obtaining the first and final portions of a composite sample shall not exceed __ min. Answer - 15 min. Portions of a composite sample shall be thoroughly mixed before beginning test on the sample. T/F Answer - True Start tests for slump, temp, and air content within __ min. after obtaining the final portion of the composite sample. Answer - 5 min. start molding specimens fr strength tests within __ after fabrication the composite sample. Answer - 15 min. The concrete sample must be protected from contamination and __. Answer - Rapid evaporation The maximum size sample for making strength test specimens is __ ft cubed Answer - 1 foot cubed. When sampling from a STATIONARY mixer, the batch must be sampled at __ or more regularly spaced intervals during discharge of the middle portion of the batch. Answer - 2