ACI Grade 1 Field Testing Certification Practice Test - Irving Questions and Answers 100% Solved correctly

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. (T or F) - Answer-False (2-5 minutes) The temperature measuring device must be accurate to within 0.1 degree. (T or F) - AnswerThe temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete throughout a range of _____ to _____ degree F ( ______ to ______ degree C) - Answer-30 to 120 degree F ( 0 to 50 degree C) A composite sample is not needed if only the temperature test is being run. (T or F) - Answer-True The temperature of fresh concrete in a placement must be measured by inserting a thermometer into the top six inches of concrete. (T or F) - Answer-False (3 in.) The temperature of the concrete is recorded to the nearest ______ degree F (______ degree C) - Answer-1 degree F (0.5 degree C) ASTM C1064 states the container used to measure temperature of concrete must be large enough to provide at least 5 inches of concrete around the sensor. (T or F) - AnswerCalibrate the temperature measuring device at least __________, or 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. (T or F) - Answer-False The maximum allowable time between obtaining the first and last portions of the composite sample may not exceed 5 minutes. (T or F) - Answer-False Start molding specimens for strength tests within 30 minutes after fabricating the composite sample. (T or F) - Answer-False (15 mins) The composite concrete sample must be protected from sun, wind, contamination and rapid evaporation. (T or F) - Answer-False (Contamination and rapid evaporation) If 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. (T or F) - Answer-False (wet screened) The composite sample not be remixed before beginning any tests. (T or F) - Answer-False Sampling should normally be performed, as the concrete is discharged from the mixer. (T or F) - AnswerTrue ASTM Method C172 includes the sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment. (T or F) - Answer-True After sampling is completed, start the tests for slump and air content within: - Answer-None of the above (5 mins) In any case, do not obtain samples until: - Answer-All the water and admixtures have been added to the concrete No 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: - Answer-1 cubic foot Sample the concrete from the chute of a truck mixer by: - AnswerFresh concrete to be tested at the job site should be sampled from: - Answer-Two or more regularly spaced intervals during discharge of the middle portion of the batch The elapsed time between obtaining the first and final portions of the composite sample, according to ASTM C172, shall not exceed: - Answer-None of the above The sides of the slump cone should be tapped with the mallet to consolidate the concrete in the mold. (T or F) - Answer-False For the slump test, when Rodding the second layer and the top layer, the tamping rod should just penetrate into the underlying layer. (T or F) - Answer-True According to ASTM C143, it is permissible to use a mold, which clamps to a non-absorbent base. (T or F) - Answer-True When filling the final layer of the slump cone, never heap the concrete above the top of the mold. (T or F) - Answer-False The filling of the slump cone should be done in three layers of equal height. (T or F) - Answer-False The slump test may be done on any flat surface. (T or F) - Answer-False When filling the slump cone, each layer should be rodded 25 times. (T or F) - Answer-True The slump cone is filled in three layers of equal volume. (T or F) - Answer-TrueConcrete should be removed from around the base before the cone is lifted. (T or F) - Answer-True The 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-Quarter of an 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 The slump cone must be placed: - Answer-On a flat moist, non-absorbent, rigid surface When rodding the second and third layers, the rod should penetrate the preceding layer by about 1 inch. (T or F) - Answer-True The normal ½ cubic foot bucket may not be used to determine Density (unit weight) of lightweight concrete. (T or F) - Answer-False (0.2 bucket) Concrete slump of less than 1 inch should be consolidated using a vibrator. (T or F) - Answer-TrueASTM C138 states, "the minimum capacity of the bucket depends on the maximum slump requirement." (T or F) - Answer-False According to ASTM C138, after rodding each layer, tap the sides of the container, with the rod exactly 25 times. (T or F) - Answer-False The outside of the density bucket should be cleaned before weighing. (T or F) - Answer-True Concrete with a slump less than 1 inch should be rodded 25 times per layer. (T or F) - Answer-False (Use Vibrator) According to C138, concretes with slumps of 1-3 inches may be compacted with the vibrator or the rod. (T or F) - Answer-True The unit weight bucket must be calibrated at least once a month. (T or F) - Answer-False According to ASTM C138, when rodding the bottom layer, the rod shall not forcibly strike the bottom of the measure. (T or F) - Answer-True The strike-off plate must be: - Answer-At least 1/4 inch thick if metal At least 1/2 inch thick if glass or acrylic Flat (All of the above) Given the following: wt of bucket 16.2 lbs, volume of bucket =0.498 cf, wt of bucket and concrete 88.5 lbs. - Answer-177.2 lb/ft^3 What is the optimum amount of the concrete that should be protruding above the top of the mold after the third layer has been tapped by the mallet? - Answer-About a 1/8th inch