ASTM D1557-58t ?

[ERC123]

When the modified proctor came out in 1958 did it require 3 layers or 5 layers when pounding soil into the mold. I know that it is currently 5 layers and has been that way at least since 1970 but I do not have a copy of the original method. I also know that the standard proctor, ASTM D698 is 3 layers.

 

[oldestguy]

I have a reference dated 1963 showing five layers. That's provably the original considering how slow committee of ASTM work.

 

[ERC123]

Thanks for the help oldestguy. I figured this was the case but I just needed to be shure.