what IS the 28 day compressive strength?? Did rain hit the wet
concrete?? (I assume no frozen temps were encountered)
means core the slab in at least 3 places and observe, plus I think that I
would do a cylinder test on these cores.
this point you get at least 3000 psi, mesh or rebar was Properly placed, then
consult with Master Builders or Sika or similar floor hardener
people. I'm a little
skeptical about trying to "harden" an existing WEAK material as you've
described. You may want to make the contractor post a bond in the case
that it all fails 2 years (or so) down the road; and if he won"t do this, then
just RIP IT OUT and start over.
-----Original Message----- From: T. Eric Gillham PE
[mailto:teric(--nospam--at)gk2guam.com] Sent: Monday, February 26, 2001 1:47
AM To: seaoc list Subject: Concrete
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
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.