From: "Laurence B. Oeth III" <viacalx(--nospam--at)europa.com>
Date: Sun, 27 Jun 1999 12:40:24 -0500
Hasan Hindawi wrote:
> I've used guniting in several relatively small scale domes. The problem is
> that the procedure does not give you the specified concrete design strength.
> Therefore, samples should be taken and tested prior to guniting the actual
> -----Original Message-----
> From: Laurence B. Oeth III <viacalx(--nospam--at)europa.com>
> To: seaint(--nospam--at)seaint.org <seaint(--nospam--at)seaint.org>
> Date: Sunday, June 27, 1999 2:28 AM
> Subject: Re: Shotcrete Loading
> >Roger Turk wrote:
> >> A. Yango,
> >> Shotcrete = Pneumatically Placed Mortar (PPM) = Gunite (TM)
> >> The method where mortar (concrete) is blown against earth/forms using
> >> compressed air. The mortar can be a wet mix or a dry mix where the water
> >> inserted at the nozzle. Most commonly used in construction of in-ground
> >> residential swimming pools and slope protection at bridge abutments.
> >> A. Roger Turk, P.E.(Structural)
> >> Tucson, Arizona
> >> A. Yango wrote:
> >> I just would like to ask what is shotcreting. We might have an equivalent
> >> term for that here in PI. Thanks.
> >NOTE: Shotcrete and gunnite are not the same. Shotcrete is a concrete
> >mixture which is mixed and pumped and sprayed out the nozzle. With
> >gunnite, water and cementitious materials are mixed at the nozzle.
> >(...or did I get those two reversed? Never can remember) Anyway, both
> >have advantages and disadvantes and are sensitive to the experience of
> >the applicator. Perhaps more for the gunnite.
> >Laurence B. Oeth, P.E.
What design strength were you specifying? Did the applicator have a
track record of achieving your specified strength on other jobs?
It can be done, but shotcrete and gunnite for structural purposes is
definitely a specialty and needs to be approached that way in design.
Laurence Oeth, P.E.