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Posted by marson on October 28, 2007, 9:06 pm
> What will be the penalty to pay if adding a bit more water to the
> screed mix to make it more workable? When passing a straight edge
> between screeds it tends to drag some of the material and leaves
> blemishes. Also, the very dry material is difficult to get all around
> the underfloor heating pipes. I am only following the advice they give
> that says to mix the sand and cement quite dry.
>
> Another one: if lifting the screed guides buried in the screed after
> levelling the top they leave a hollow. When is the right time to fill
> these hollows?
You should tell us what you are doing. Basement floor slab? Mud bed
for tile? Do you need a smooth finish? The wetter concrete will
give you more shrinkage and the concrete will not be as strong.
However, even weak concrete can be strong enough for some
applications, and wetter concrete is easier to move around in the
forms and to finish to a smooth surface. On the other hand, if you
are doing a thin layer as a setting bed for tile, you want it fairly
dry since the finish doesn't matter but strength and shrinkage does.
Holes from screed guides should be filled as soon as you pull the
pipes and before bull floating (if you are bull floating that is).
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