ACI Certification- Concrete Field-Testing Technician Grade 1 CP-1 (12) 100% Correct Answers | Verified | Latest 2024 Version

ACI Certification- Concrete Field-Testing Technician Grade 1 CP-1 (12) 100% Correct Answers | Verified | Latest 2024 Version The sensor of the temperature measuring device shall be submerged a minimum of ______ inches into the freshly mixed concrete. - 3" The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to ± ______ °F throughout a range of ____________. - 1 degree, 30 degrees to 120 degrees The temperature measuring device shall be calibrated ______ , or whenever there is a question of ______ . - Annually, accuracy The temperature of concrete may be measured in a wheelbarrow. True or False? - True The temperature of concrete may be measured in a wall form. True or False? - True 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? - Close off air voids by gently pressing the concrete around the device How long must the temperature measuring device remain in the freshly mixed concrete? - minimum of two minutes, maximum of five minutes The temperature of the concrete is reported to the nearest ______ °F - 1 degree A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False? - False ASTM C172 - Standard Practice for Sampling Freshly Mixed Concrete Sampling by this method is required when tests are to be made to determine _____ with specification requirements. - Compliance This method covers sampling from four types of mixers, 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 Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. True or False? - True 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 The molding of strength test specimens shall begin within _____ minutes after fabricating the composite sample. - 15 The concrete sample must be protected from contamination and _____. - Rapid evaporation The minimum size sample for making strength test specimens is _____. - 1 cubic foot 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. - 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. - 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 the batch. - 2 Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. True or False? - False The composite sample from a truck mixer must be obtained from the _____ portion of the batch. - middle When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be _____ _____ before making the test. - wet sieved What must occur before a sample of concrete can be taken from a revolving drum mixer? (Oral Exam) - All of the water must be added to the mixer