"Joseph Meehan" wrote in message
Somehow I get the feeling this is a poor idea. I don't think anyone
will be able to answer authoritatively as I doubt if anyone has, or will,
try it.

BTW the amount of water in the mix is not, or should not, be dependent
on desired workability, There are specific ratios and messing with them
will reduce the strength of the final product. Water becomes part of the
concrete. With a proper mix very little evaporates.

Detergents contain surfactants so, in theory, the water would mix easier
with the cement and aggregate. Would I try it? No.