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

ACI Concrete Field Testing Technician- Grade I Exam Questions with Answers The temperature of concrete may be measured in a wall form. True or False - Answer- True The sensor of the temperature measuring device shall be submerged a minimum of _____ in. into the freshly mixed concrete. - Answer- 3 in. Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True or False? - Answer- True 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, 30 degrees F to 120 F 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 A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True or 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 - Answer- 1 degree 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 or False? - Answer- False This method covers sampling from four types of mixtures which are _____, _____, _____, and _____. - Answer- 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. - Answer- 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. - Answer- 5 The molding of strength test specimens shall begin within _____ minutes after fabricating the composite sample. - Answer- 15 The concrete sample must be protected from sources of _____ and _____. - Answer- contamination and rapid evaporation The minimum size sample for making strength test specimens is _____. - Answer- 1ft^3 When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch - Answer- 2 The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge. - Answer- 5 When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____ regularly spaced intervals during discharge of the middle portion of this batch. - Answer- 2