Return to index: [Subject] [Thread] [Date] [Author]

Re: Shotcrete Loading

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Hasan Hindawi wrote:
> 
> Greetings,
> 
> 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
> structure.
> 
> -----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
> is
> >> 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.