ACI Grade 1 Field Testing Certification Practice Test Questions & Answers Solved 100% Correct!!

For concrete with aggregates less than 3 inches, the thermometer must remain in the fresh concrete sample a minimum of 5 minutes or until the temperature reading stabilizes. (True or False) - AnswerFalse The temperature measuring device must be accurate to within 0.1 degrees. (True or False) - AnswerFalse The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete throughout a range of ______ to ______ Fahrenheit ( - AnswerA composite sample is not needed if only the temperature test is being run. (True or False) - Answer-True The temperature of fresh concrete in a placement must be measured by inserting a thermometer into the top six inches of concrete. (True or False) - Answer-False The temperature of the concrete is recorded to the nearest _______ Fahrenheit (______ Celcius). - Answer-2, 0.5 ASTM C1064 states the container used to measure temperature of concrete must be large enough to provided at least 5 inches of concrete around the sensor. (True or False) - AnswerCalibrate the temperature measuring device at least _________, or at least whenever there is a question of accuracy. - Answer-Annually After the thermometer is placed in the concrete: - Answer-Gently press concrete around the thermometer According to ASTM C1064, what is one reason to take the temperature of concrete? - Answer-Verify conformanceIt is allowable to remove the temperature measuring devices from the freshly mixed concrete to read the temperature if you cannot see the reading. (True or False) - AnswerThe maximum allowable time between obtaining the first and last portions of the composite sample may not exceed 5 minutes. (True or False) - AnswerStart molding specimens for strength tests within 30 minutes after fabricating the composite sample. (True or False) - AnswerThe composite concrete sample must be protected from sun, wind, contamination, and rapid evaporation. (True or False) - AnswerIf the concrete contains aggregates larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test. (True or False) - AnswerThe composite sample should not be remixed before beginning any tests. (True or False) - AnswerSampling should normally be performed, as the concrete is discharged from the mixer. (True or False) - AnswerASTM Method C172 includes sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment. (True or False) - AnswerAfter sampling is completed, start the tests for slump and air content within: - AnswerIn any case, do not obtain samples until: - AnswerNo samples shall be taken before _________ or after _________ of the batch has been discharged. - AnswerWhen strength tests are to be made, the minimum size of the composite sample shall be: - AnswerSample the concrete from the chute of a truck mixer by: - AnswerFresh concrete to be tested at the job site should be sampled from: - AnswerThe elapsed time between obtaining the first and final portions of the composite sample, according to ASTM C172, shall not exceed: - AnswerThe sides of the slump cone should be tapped with the mallet to consolidate the concrete in the mold. (True or False) - Answer-False For the slump test, when rodding the second later and the top layer, the tamping rod should just penetrate into the underlying later. (True or False) - Answer-True According to ASTM C143, it is permissible to use a mold, which clamps to a non-absorbent base. (True or False) - Answer-True When filling the final layer of the slump cone, never heap the concrete above the top of the mold. (True or False) - Answer-False The filling of the slump cone should be done in three layers of equal height. (True or False) - Answer-True The slump test may be done on any flat surface. (True or False) - Answer-False When filling the slump cone, each layer should be rodded 25 times. (True or False) - Answer-True The slump cone is filled in three layers of equal volume. (True or False) - Answer-True Concrete should be removed from around the base before the cone is lifted. (True or False) - AnswerTrueThe slump cone should be raised carefully, vertically upward, in a steady motion in _______ seconds - Answer-3 to 7 The elapsed time between the start of filling the slump cone and the removal of the cone must be no more than: - Answer-2 1/2 minutes The slump should be measured to the nearest - Answer-1/4 inch In order to determine slump, you should measure the vertical distance from: - Answer-Top of the mold to the displaced original center of the top surface The dimensions of the slump cone are: - Answer-Top diameter 4 inches, bottom diameter 8 inches, height 12 inches In the slump test, if a decided falling away or shearing off the concrete from one side or portion of the mass occurs upon raising the slump cone, one should: - Answer-Disregard the test and make a new test on another portion of the sample The slump cone should be struck-off with: - Answer-The tamping rod