Additional amounts of water, thrown in under the mistaken impression that it will make the concrete easier to work and to finish, will on the contrary have only the following effects: it will weaken the concrete. It will produce concrete which is more likely to crack because of high shrinkage and reduced tensile strength. It will cause excessive bleeding, which in turn results in poor wearing surfaces, sand streaks and excessive dusting and crazing. It will cause excessive voids in the concrete and thus increase the likelihood of leaking through foundation walls and basement floors. And finally, it will delay finishing operations and thus largely cancel out any labor saved as a result of increased workability.