A recent ballot and new 5.3.1 and Note 3 to C1670/C1670M to make it explicit that slump/slump flow are tested, but air content is optional. The new Note 3 pointed out that air content can be useful information for correlating with compressive strength, freeze-thaw durability, and other properties.
A comment to that ballot item pointed out that unit weight is also a useful optional test. While unit weight is already optional in C31.C31M, this ballot item proposes to explicitly state in in 5.3.1 and Note 3 to clarify for the user of the standard that unit weight is a useful optional test.
Date Initiated: 01-24-2024
Technical Contact: Nicholas Lang