ACI Certification Practice Questions – Concrete Field, Strength, and Aggregate Testing Exam Prep

Description: This file contains a wide range of verified practice questions and answers for multiple ACI certifications, including field testing, strength testing, and aggregate testing. Topics include ASTM standards, slump tests, air content determination, density calculations, and specimen preparation. It serves as a complete exam prep resource for candidates seeking ACI technician certification across different testing areas. ASTM C1064 - answerStandard Test Method For Temperature of Freshly Mixed Hydraulic Cement Concrete The sensor of the temperature measuring device shall be submerged a minimum of ______ inches into the freshly mixed concrete. - answer3" The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to ± ______ °F throughout a range of ____________. - answer1 degree, 30 degrees to 120 degrees The temperature measuring device shall be calibrated ______ , or whenever there is a question of ______ . - answerAnnually, accuracy The temperature of concrete may be measured in a wheelbarrow. True or False? - answerTrue The Page1 temperature of concrete may be measured in a wall form. True or False? - answerTrue 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? - answerClose off air voids by gently pressing the concrete around the device How long must the temperature measuring device remain in the freshly mixed concrete? - answerminimum of two minutes, maximum of five minutes The temperature of the concrete is reported to the nearest ______ °F - answer1 degree A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False? - answerFalse ASTM C172 - answerStandard Practice for Sampling Freshly Mixed Concrete 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 mixers, 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 before beginning tests on the sample. True or False? - answerTrue The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, Page2 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 _____. - answer1 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. - 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 the 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 sample from a truck mixer must be obtained from the _____ portion of the batch. - answermiddle When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be _____ _____ before making the test. - answerwet sieved What must occur before a sample of concrete can be taken from a revolving drum mixer? (Oral Exam) - answerAll of the water must be added to the mixer Describe the different procedures that can be used to collect a sample of concrete from a stationary or revolving drum mixer. (Oral Exam) - answerRepeatedly pass a receptacle Page3 through the entire discharge stream, Completely divert the discharge stream into a sample container What are the required steps for collecting a sample of concrete from a stationary or revolving drum mixer? (Oral Exam) - answerCollect two or more portions of concrete, Take the portions at regularly spaced intervals, Take the portions from the middle of the batch Describe the procedure for collecting a sample of pavement concrete deposited on grade. (Oral Exam) - answerDischarge the contents of the paving mixer, Obtain samples from at least five different portions of the pile What is the minimum size for a sample when strength test specimens are to be molded? (Oral Exam) - answer1 cubic foot (28 L) What is the maximum allowable time between obtaining the first and final portions of the composite sample? (Oral Exam) - answer15 min. What is required after the concrete sample has been transported to the place where tests are to be performed? (Oral Exam) - answerCombine and remix the sample with a shovel What should be done if the concrete contains aggregate larger than is appropriate for the size of the molds or equipment being used? (Oral Exam) - answerWet sieving Start the