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what type of cement or mortar harmon 10-28-2006
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Posted by harmon on October 28, 2006, 3:58 pm


my in-laws asked me to do a small repair for an in-ground pool, top suction area.

the pool is a standard gunite diamondbrite finish and the pool cleaner goes into
an
opening cavity on the very top at water level, into a small round pool where the
main
suction line exists (another is on the bottom of pool)

in the small round area, there is a small crack in the cement right above the
water
line or just at the waterline

I have to drain the pool a little but am asking what type of cement to use to
repair
this crack as it will be exposed to the pool chemicals though most of it is
above
water level. none of this is the actual swimming pool, it's the small round hole
outside the pool wall, about 1 foot away from the wall of the pool and exists
only for
the top suction line into the pool pump



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Posted by Jack on October 28, 2006, 8:15 pm



harmon wrote:
> my in-laws asked me to do a small repair for an in-ground pool, top suction
area.
>
> the pool is a standard gunite diamondbrite finish and the pool cleaner goes
into an
> opening cavity on the very top at water level, into a small round pool where
the main
> suction line exists (another is on the bottom of pool)
>
> in the small round area, there is a small crack in the cement right above the
water
> line or just at the waterline
>
> I have to drain the pool a little but am asking what type of cement to use to
repair
> this crack as it will be exposed to the pool chemicals though most of it is
above
> water level. none of this is the actual swimming pool, it's the small round
hole
> outside the pool wall, about 1 foot away from the wall of the pool and exists
only for
> the top suction line into the pool pump

My guess is that you should use Hydraulic Cement. But someone else may
have a different opinion.


Posted by Richard J Kinch on October 29, 2006, 1:25 am


Jack writes:

> My guess is that you should use Hydraulic Cement.

Wrong guess. So-called "hydraulic" cement is just (very) quick-setting
ordinary cement. Not appropriate for this type of repair.

Posted by krw on October 29, 2006, 12:19 pm


kinch@truetex.com says...
> Jack writes:
>
> > My guess is that you should use Hydraulic Cement.
>
> Wrong guess. So-called "hydraulic" cement is just (very) quick-setting
> ordinary cement. Not appropriate for this type of repair.

I thought "hydraulic cement" was designed to set up and cure under
water.

--
Keith


Posted by BobK207 on October 29, 2006, 1:06 pm



krw wrote:
> kinch@truetex.com says...
> > Jack writes:
> >
> > > My guess is that you should use Hydraulic Cement.
> >
> > Wrong guess. So-called "hydraulic" cement is just (very) quick-setting
> > ordinary cement. Not appropriate for this type of repair.
>
> I thought "hydraulic cement" was designed to set up and cure under
> water.
>
> --
> Keith


I'm a little confused by the term Hydraulic cement as well

my understanding of it is:

"Hydraulic cement" is a fast setting cement formulated in such a way
that it expands slightly on setting in contrast to common cement which
does the opposite. As such,"hydraulic cement" is used for watertight
patches of small cracks or holes in concrete.

but I don't know if Hydraulic cement can be placed in small quantities
underwater. The concern would be that the water would wash away the
cement or dilute the mix.

I think the main idea of Hydraulic cement is the expansive nature.


"ordinary" concretes made with portland cement can be placed & will
cure underwater as long as care is taken during placement.

A tremie is used so that the concrete is "piped" down through the
water & the concrete exits the tremie into the "blob" of concrete being
placed. Care is taken such that new concrete always enters the "blob"
so that only the concrete on the surface of the "blob" is subjected to
the water / dilution effects.

The end result is quantity of placed concrete underwater where only the
surface concrete has been subjected to the water / dilution effects.
Typically the concrete item is enlarged to take into effect the lose of
concrete quality at the surface.

cheers
Bob


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