ACI Concrete Field Testing Technician - Grade I Questions with Correct Answers

The end of the temperature sensing portion of the temperature measuring device is submerged a minimum of __mm [__in.] into the freshly mixed concrete. Correct 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 __. Correct Answer 0.5 C / +-1F / 0-50 Decrees C The temp. measuring device shall be verified __, or whenever there is a question of __. Correct Answer Annually / accuracy The temp of concrete may be measured in a wheelbarrow? T/F Correct Answer True The temp. of concrete may be measured in a wall form. T/F Correct Answer True A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temp. T/F Correct Answer False What must be done to the sample container prior to sampling the concrete Correct 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? Correct 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? Correct Answer At least 2 min., no longer than 5 min. After the temperature of the concrete is read, what is then required? Correct Answer Reporting of temp. The temp. of concrete is reported to the nearest __. Correct Answer 1 degree F According to ASTM C1064, what is one reason to take the temperature of concrete? Correct Answer to verify conformance to a specific requirement. A max. temp. of freshly mixed concrete is specified in ASTM C1064. T/F Correct Answer False The sample of concrete used for temperature determination must be rodded 25 times. Correct 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. Correct Answer Compliance