ACI Written Exam|133 Complete Questions and Answers The sensor of the temperature measureing device shall be submerged a minimum of ____ in - -3 (75mm) -The temperature measureing device shall have a capacity of measuring temperature of freshly mixed conrcrete to +-_____ degrees F throught a range of _____ - -1(.5 degrees C), 30-120 (0-50 degrees C) -The temperature measuring device shall be calibrated____, or whenever there is a question of _____ - -annually, accuracy -The temp of concrete may be measured in a wheelbarrow - -true -the temp of concrete may be measured in a wall form - -true -A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temp. - -false -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 temp measuring device after the device has submerged - -Press concrete around measuring device -How long must the temp device remain in the concrete - -at least 2 minutes (but no more than 5) -After temp of concrete is read, what then is required - -reporting of temp -the temp of concrete to be measured to the nearest ____degree F - -1 (.5 degree C) -According to the ASTM C1064 what is one reason to take the temp of concrete - -verify conformance to a specified requirement for temp -A max temp of concrete is specified in ASTM C1064 - -False -The sample of concrete used for temp determination must be rodded 25 times - -False -Sampling by this method is required when tests are to be made to determine ____ with specification requirements - -compliance 1 / 2
-The method covers sampling from four types of mixers which are _____, _____, ____, and _______ - -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 - -15 -Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample - -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 - -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 test specimen is - -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 - -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 - -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 permitted for a particular test method, the sample fo concrete must be ______ ______ before making the test - -Wet Sieved
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