ACI Concrete Field-Testing Technician- Grade I Correct Questions & Solutions.

The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. - ANSWER 3 in. [75 mm] The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. - ANSWER 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C] The temperature measuring device shall be calibrated _____, or whenever there is a question of _____. - ANSWER Annually, accuracy The temperature of concrete may be measured in a wheelbarrow. True or False? - ANSWER True The temperature of concrete may be measured in a wall form. True of False - ANSWER True A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False? - ANSWER False What must be done to the sample container prior to sampling the concrete? - ANSWER Dampen (with water) What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete. - ANSWER Gently press the concrete around the temperature measuring device at the surface of the concrete How long must the temperature measuring device remain in the freshly mixed concrete? - ANSWER At least 2 minutes but not more than 5 minutes After the temperature of the concrete is read, what is required? - ANSWER Reporting of temperature The temperature of concrete is reported to the nearest _____ degrees F [_____ C] - ANSWER 1 degree F [0.5 C] According to ASTM C1064, what is one reason to take the temperature of concrete? - ANSWER Verify conformance to a specified requirement for temperature of concrete A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of F