Three new business items from the June 2017 C09.45 are being addressed as follows: 1.Replace gently jar the meter with tap the bowl with the mallet. 2.Note where the volume of the measuring bowl is determined. 3.Revise the bias statement to state that there is no reference material available. Additionally, the standard will be revised to limit its use to a MSA of 2 inches. The standard currently determines air and density for RCC containing aggregate that passes the 2 inch sieve. It only estimates the air content for larger aggregate RCC. The significance and use section states the following. 4.2 If the concrete being tested contains aggregate that would be retained on a 50-mm (2-in.) sieve, the air content of the total mixture is only approximated by the test. 4.3 The test determines the density of freshly mixed RCC containing aggregate with a maximum size not greater than 50-mm (2-in.). This is confusing and the calculations necessary for estimating the air for plus 2 inch aggregate RCC adds another level of confusion. The paving industry doesnt use plus 2 inch aggregate and plus 2 inch aggregate mixtures are rarely seen on water resources projects. Therefore, the change will simplify the standard and not significantly limit its use.
Developed by Subcommittee: C09.45
Staff Manager: W Scott Orthey
Date Initiated: 10-26-2017
Technical Contact: Edward Deaver
Ballot: C09 (21-06)
Status: Will Reballot Item