ACI Written Exam with Complete Solutions 2023/2024 The sensor of the temperature measureing device shall be submerged a minimum of ____ in - Correct Answer 3 (75mm) The temperature measureing device shall have a capacity of measuring temperature of freshly mixed conrcrete to +-_____ degrees F throught a range of _____ - Correct Answer 1(.5 degrees C), 30-120 (0-50 degrees C) The temperature measuring device shall be calibrated____, or whenever there is a question of _____ - Correct Answer annually, accuracy The temp of concrete may be measured in a wheelbarrow - Correct Answer true the temp of concrete may be measured in a wall form - Correct Answer true A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temp. - Correct Answer false What must be done to the sample container prior to sampling the concrete - Correct Answer dampen (with water) what must be done to the concrete surrounding the temp measuring device after the device has submerged - Correct Answer Press concrete around measuring device How long must the temp device remain in the concrete - Correct Answer at least 2 minutes (but no more than 5) After temp of concrete is read, what then is required - Correct Answer reporting of temp the temp of concrete to be measured to the nearest ____degree F - Correct Answer 1 (.5 degree C) According to the ASTM C1064 what is one reason to take the temp of concrete - Correct Answer verify conformance to a specified requirement for temp A max temp of concrete is specified in ASTM C1064 - Correct Answer False The sample of concrete used for temp determination must be rodded 25 times - Correct Answer False Sampling by this method is required when tests are to be made to determine ____ with specification requirements - Correct Answer compliance 1 / 2
The method covers sampling from four types of mixers which are _____, _____, ____, and _______ - Correct Answer stationary mixes, 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 - Correct Answer 15 Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample - Correct Answer True The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temp, and air content is ______ minutes - Correct Answer 5 the molding of strength test specimens shall begin within ____ minutes after fabricating the composite sample - Correct Answer 15 The concrete sample must be protected from contamination and ____ - Correct Answer rapid evaporation The minimum size sample test specimen is - Correct Answer 28 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 - Correct 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 - Correct 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 the batch - Correct Answer 2 Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site - Correct Answer False The composite sample from a truck mixer must be obtained from the _____ portion of the batch - Correct Answer Middle When the concrete contains aggregate larger than permitted for a particular test method, the sample fo concrete must be ______ ______ before making the test - Correct Answer Wet Sieved The slump test is applicable to plastic concrete with a max aggregate size of ____ in - Correct Answer 1.5 in (37.5 mm)
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