[Greenbuilding] Passive solar home--concrete overlay re thermal mass
RT
archilogic at yahoo.ca
Mon May 13 08:16:08 CDT 2013
On Mon, 13 May 2013 01:07:56 -0400, KTOT (g) <ktottotc at gmail.com> wrote:
> 2 in. concrete slab
> the slab and stain/sealer are completely defective and most likely have
> to be replaced,
> putting a concrete overlay product atop the existing slab. This overlay
> product consists of two parts--1) Portland cement, aggregate, and a
> stain, and 2) a modified acrylic latex resin. My believe is this product
> is not good thermal mass (atop the concrete)
My belief is that your belief is incorrect.
The modified acrylic latex resin is an admixture which during the mixing
process simply replaces some of the water used in the mix. The amount of
the thermal mass materials (sand and stone aggregate) remains the same
whether the admixture is used or not.
The function of the admix is to improve the bond between the new layer and
the old ... as well as improving some of the properties of the new layer.
You don't mention what it is about the 2 inch concrete slab that is
"completely defective" that necessitates its replacement.
My guess is that it was poorly finished (ie screeding,floating,trowelling
done at the wrong times resulting in poor-quailty concrete ... perhaps too
much water in the mix as well), cured improperly and too thin (if not just
a thin mass overlay atop a structural floor).
However, these "problems" are fairly common in many if not most new
developer-built small residential projects where the concrete slab is
usually just a sub-floor with something slapped over top for the optical
finish.
--
=== * ===
Rob Tom AOD257
Kanata, Ontario, Canada
< A r c h i L o g i c at Y a h o o dot c a >
(manually winnow the chaff from my edress if you hit "reply")
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