ACI Grade 1 - Written Test 2024 with Complete Solutions

ACI Grade 1 - Written Test 2024 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) -Answer-Compliance This practice covers sampling from five types of equipment which are... (C172/C172M- 17 = Sampling Freshly Mixed Concrete) -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) -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) -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) -Answer-5 Start molding specific ends for strength tests within ___ after fabricating the composite sample (C172/C172M-17 = Sampling Freshly Mixed Concrete) -Answer-15 The concrete sample must be protected from contamination and ... (C172/C172M-17 = Sampling Freshly Mixed Concrete) -Answer-Rapid evaporation (also sun and wind) The minimum size sample for making strength test specimens is ... (C172/C172M-17 = Sampling Freshly Mixed Concrete) -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) -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) -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 portion of the batch. (C172/C172M-17 = Sampling Freshly Mixed Concrete) -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) -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) -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) -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) -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) - 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) -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) - 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) -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) -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) - 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) -Answer-Gently press the concrete 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) - 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) -Answer-Reporting of temperature The temperature of the concrete is reported to the nearest... (C1064/C1064M-17, Temperature of Freshly Mixed Hydraulic-cement concrete) -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) -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) - 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) - 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) -Answer-1.5 in (37.5 mm)