ACI Grade 1 - Written Test Questions with Complete Solutions Sampling by this practice covers procedures for obtaining representative samples, on which tests are to be performed to determine ___ with quality requirements of the specifications listed under which the concrete is furnished (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer Compliance This practice covers sampling from five types of equipment which are... (C172/C172M- 17 = Sampling Freshly Mixed Concrete) - Correct Answer Stationary, paving, revolving drum, continous, and open top mixers The elapsed time between obtaining the first and final portions of a composite sample shall not exceed... (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer 15 mins T or F: Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer True Start tests for slump, temperature, and air content within ___ after obtaining the final portion of the composite sample (C172/C172M-17 = Sampling Freshly Mixed Concrete)
- Correct Answer 5
Start molding specific ends for strength tests within ___ after fabricating the composite sample (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer 15 The concrete sample must be protected from contamination and ... (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer Rapid evaporation (also sun and wind) The minimum size sample for making strength test specimens is ... (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer 28 L (aka 1 ft3) 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 (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer 2 When sampling from a paving mixer, obtain samples from at least ___ different portions of the pile and combine them into one composite sample for test purposes (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer 5 When sampling from a revolving drum truck mixer, sample the concrete by collecting ___ or more portions take at regularly spaced intervals during discharge of the middle 1 / 3
portion of the batch. (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer 2 T or F: Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer F The composite sample from a truck mixer must be obtained from the ___ portion of the batch (C172/C172M-17 = Sampling Freshly Mixed Concrete) - Correct Answer Middle When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be _____ before making the test. (C172/C172M- 17 = Sampling Freshly Mixed Concrete) - Correct Answer Wet Sieved The end of the temperature sensing portion of the temperature measuring device is Submerged a minimum of ____ into the freshly mixed concrete (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer 75 mm (3 in) The temperature measuring device shall be capable of accurately measuring the temperature of freshly mixed concrete to ____ throughout a range of ____.(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer +/- 0.5 C, 0 to 50 C (30 to 120 F) The temperature measuring device shall be verified ___, or whenever there is a question of ___. (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer Annually, accuracy
T or F: The temperature of concrete may be measured in a wheelbarrow
(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer True T or F: The temperature of concrete may be measured in a wall form. (C1064/C1064M- 17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer True
T or F: A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temperature. (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer False What must be done to the sample containers prior to sampling the concrete?(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer Dampened (with water) What must be done to the concrete surrounding the temperature measuring after the device is submerged in the fresh concrete? (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer Gently press the concrete 2 / 3
around the temperature measuring device at the surface of the concrete (to remove air voids) How long must the measuring device remain in the freshly mixed concrete?(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer At least 2 mins, but not more than 5 minutes After the temperature of the concrete is read, what is then required? (C1064/C1064M- 17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer Reporting of temperature The temperature of the concrete is reported to the nearest... (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer 0.5 C (1 F) According to Test Method C1064/C1064M, what is one reason to take the temperature of concrete? (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer Verify conformance to a specified requirement for temperature of concretely T or F: A maximum temperature of freshly mixed concrete is specified in ASTM C1064.(C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer False T or F: The sample of concrete used for temperature determination must be rodded 25 times. (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) - Correct Answer False (not rodded at all) The slump test is applicable to plastic concrete with a maximum size aggregate of _____. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) - Correct Answer 1.5 in (37.5 mm) When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _____. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) - Correct Answer Removed by wet surfing the sample over 1.5 in (37.5 mm) sieve The mold for making the slump test is in the shape of _____. (C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) - Correct Answer The frustum of a cone The height of the slump mold is _____. (C143/C143M - 15a, Slump of Hydraulic- Cement Concrete) - Correct Answer 12 in (300 mm) T or F: The interior surface of the slump mold is allowed to have minor irregularities. - Correct Answer False
- / 3