ACI Concrete Field-Testing Technician Grade I – Exam Questions and Verified ASTM C1064, C172, and Slump Test Answers

Description: This exam prep document provides 100% verified ACI Grade I questions and answers. It covers ASTM standards such as C1064 (temperature), C172 (sampling), and detailed slump test procedures. Other topics include air content determination, curing, rodding, vibration, and equipment requirements. Designed for technician certification candidates, it ensures comprehensive coverage of field testing methods. The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. - answer3 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 _____. - answer1 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 _____. - answerAnnually, accuracy The temperature of concrete Page1 may be measured in a wheelbarrow. True or False? - answerTrue The temperature of concrete may be measured in a wall form. True of False - answerTrue A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False? - answerFalse What must be done to the sample container prior to sampling the concrete? - answerDampen (with water) What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete. - answerGently 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? - answerAt least 2 minutes but not more than 5 minutes After the temperature of the concrete is read, what is required? - answerReporting of temperature The temperature of concrete is reported to the nearest _____ degrees F [_____ C] - answer1 degree F [0.5 C] According to ASTM C1064, what is one reason to take the temperature of concrete? - answerVerify conformance to a specified requirement for temperature of concrete A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False? - answerFalse The sample of concrete used for temperature determination must be rodded 25 times. True or False? - answerFalse Sampling by this method is required when tests are to be made to determine _____ with specification requirements. - answerCompliance This method covers sampling from four types of mixtures Page2 which are _____, _____, _____, and _____. - answerStationary 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. - answer15 Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True of False? - answerTrue 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. - answer5 The molding of strength test specimens shall begin within _____ minutes after fabricating the composite sample. - answer15 The concrete sample must be protected from contamination and _____. - answerRapid evaporation The minimum size sample for making strength test specimens is _____. - answer28 L (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 - answer2 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. - answer5 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. - answer2 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? - answerFalse The composite samples from a truck mixer must be obtained from the _____ portion of the batch. - answerMiddle When the