Strength and hardness are diffrent things. Hardness
may be important if the surface is expected to receive
some impact type loading. That does not the appear to
be the case in the situation you have described.
Is the existing concrete sitting on grade? If so, I
don't see strength of concrete being an issue, as long
as it has some strength. Can you talk to the
contractor who placed the concrete and find out the
proportion that was used? That may give you an
indication of the 28 day strength.
If permeability of existing concrete is a matter of
concern, you want to apply XYPEX compound according to
manufacturer's instructions. XYPEX has the ability to
seal the cracks in the concrete and make it
--- "T. Eric Gillham PE" <teric(--nospam--at)gk2guam.com> wrote:
> I would appreciate anyone who can give me some help
> on this one:
> How does one go about hardening and strengthening a
> layer of concrete that
> has already been cast and cured, without removing
> the concrete entirely? In
> other words, is there a product that can be added to
> the surface of the
> concrete to harden it?
> The concrete in this particular case would be
> difficult to remove because of
> embedded piping. The hardened surface would then
> have tile set on it, and
> would form the floor of a hot water wading pool.
> The layer of concrete
> which needs to be hardened was poured over 2 months
> ago, and is quite sandy
> in color with hardly any hint of gray. This would
> seem to me to indicate a
> low cement content.
> Anybody have any ideas on this one?
> T. Eric R. Gillham PE
> PO Box 3207 Agana Guam 96932
> Ph: (671) 477-9224
> Fax: (671) 477-3456
> Cel (671) 687-7115
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