Density (Nuclear Gauge) Questions And Answers With Verified Solutions

Before using a nuclear density gauge on a job, a ___________ __________ must be taken daily to determine if the gauge is operating correctly. - Answer-Standard count A suitable location for conducting a standard count is an ____________ surface, __________ feet away from large objects and _________ feet away from other nuclear gauges. - Answer-asphalt, greater than 10', greater than 60 The use of a nuclear density gauge for determining density of an asphalt pavement requires the determination of a ____________ correction factor for each gauge, mix, and every job. - Answer-Job _________ core correction factors are needed to compute each job correction factor. - Answer-5 In determining each core correction factor, four _________ density readings are taken within ___________ foot of the core location. - Answer-WD, 1 When using the backscatter method on a cold asphalt mat to determine density, set the time to ________ minute(s) and the depth to _____________. - Answer-1, backscatter To determine the density of an asphalt pavement using a nuclear density gauge, ________ random test locations are required for each sublot or lot of material. - Answer-3 Report % compaction to the nearest __________%. - Answer-0.1 A job correction factor eliminates possible gauge errors from ____________ voids or _________ irregularities. - Answer-Surface, base If the JCF is less than ______ a JCF should not be used. - Answer-1 If the JCF is greater than 1 then add the JCF to all __________ density readings before calculating % compaction. - Answer-WDBackscatter densities should be taken at the same time interval (laydown to test) as the ______ - Answer-JCF ______ densities is reported for each sublot according to ARDOT 461. - Answer-1 Report the average of all compaction tests if: A. At least ____ of the 3 are greater than or equal to ______ % and less than or equal to _____% and any remaining result is not more than ____% above or below the specification limits B. All are above or below the specification limits and no result is more than ______% above or below the limits. C. If all are outside the specification limits (different direction) and none are more than ______% out - Answer-A. 2, 92, 96, 2 B. 2 C. 2 If ______ tests are outside the specification limits (same side), and one is within the specification limits: Average only the ______ non-complying results. - Answer-2, 2