ACI Concrete Field Testing Technician- Grade I Questions & 100% Verified Answers | Latest Update | Already Graded A+

The temperature of concrete may be measured in a wall form. True or False ☑: True The sensor of the temperature measuring device shall be submerged a minimum of _____ in. into the freshly mixed concrete. ☑: 3 in. Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True or False? ☑: True The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. ☑: 1 degree F, 30 degrees F to 120 F The temperature measuring device shall be calibrated _____, or whenever there is a question of _____. EXCELLENCE 2 ☑: Annually, accuracy The temperature of concrete may be measured in a wheelbarrow. True or False? ☑: True A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True or False? ☑: False What must be done to the sample container prior to sampling the concrete? ☑: Dampen with water What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete. ☑: 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? ☑: At least 2 minutes but not more than 5 minutes After the temperature of the concrete is read, what is required? ☑: Reporting of temperature EXCELLENCE 3 The temperature of concrete is reported to the nearest _____ degrees F ☑: 1 degree F According to ASTM C1064, what is one reason to take the temperature of concrete? ☑: Verify conformance to a specified requirement for temperature of concrete A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False? ☑: False This method covers sampling from four types of mixtures which are _____, _____, _____, and _____. ☑: Stationary mixers, paving mixers, revolving drum mixers, and open top mixers The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes. ☑: 15 The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is _____ minutes. ☑: 5