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

The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. Correct 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 _____. Correct 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 _____. Correct Answer Annually, accuracy The temperature of concrete may be measured in a wheelbarrow. True or False? Correct Answer True The temperature of concrete may be measured in a wall form. True of False Correct 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? Correct Answer False What must be done to the sample container prior to sampling the concrete? Correct 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. Correct 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? Correct Answer At least 2 minutes but not more than 5 minutes After the temperature of the concrete is read, what is required? Correct Answer Reporting of temperature The temperature of concrete is reported to the nearest _____ degrees F [_____ C] Correct Answer 1 degree F [0.5 C] According to ASTM C1064, what is one reason to take the temperature of concrete? Correct 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 False? Correct Answer False The sample of concrete used for temperature determination must be rodded 25 times. True or False? Correct Answer False