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

ACI Concrete Field Testing Technician- Grade I Exam Questions with Answers Section 1: Temperature of Freshly Mixed Hydraulic-Cement Concrete - Answer- C1064 The end of the temperature sensing portion of the temperature measuring device is submerged a minimum of _____ into the freshly mixed concrete. - Answer- 3 inches The temperature measuring device shall be capable of accurately measuring temperature of freshly mixed concrete to _____, throughout a range of _____. - Answer- +/- 1 °F 30 °F to 120 °F The temperature measuring device shall be verified _____, 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 _____. - Answer- 1 °F 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 False? - Answer- False Section 2: Sampling Freshly Mixed Concrete - Answer- C172 The sample of concrete used for temperature determination must be rodded 25 times. True or False? - Answer- False Sampling by this method is required when tests are to be made to determine _____ with specification requirements. - Answer- Compliance This method covers sampling from four types of mixtures which are _____, _____, _____, _____, and _____. - Answer- Stationary mixers, Paving mixers, Revolving Drum mixers Continuous mixers, and Open Top mixers