ACI Concrete Field-Testing Technician - Grade I Exam Guide 2024

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