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Re: Treatment for potentially expansive soils (was RE: Have[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: Re: Treatment for potentially expansive soils (was RE: Have
- From: "Alexander Sasha Itsekson" <sasha(--nospam--at)engstruc.com>
- Date: Wed, 20 Nov 2002 09:04:01 -0800
Samir, That is NOT what I was describing. It isn't an active steel corrosion protection system for steel piles but rather a Electro-Chemical Soil Treatment System developed to provide for strengthening of cohesive and non-cohesive soils including foundations sub base, hillside slope and slide stabilization, temporary pavement, etc. It is not an active system - in other words once the soil is treated once, no further treatment is required. It works especially well with expansive clays where the addition of binding element to the water solution to boreholes is minimal. I hope I clarified my original post. Sasha Itsekson, SE Enginious Structures Oakland, CA PS My father worked developing and implementing this technology in Russia in 1980's --------------------------------------------------------------------------- To: <seaint(--nospam--at)seaint.org> From: Samir Ghosn <sghosn(--nospam--at)harris-assoc.com> Subject: Re: Treatment for potentially expansive soils (was RE: Have What you are describing is a system of steel piles driven into soil that is likely to have wet and dry cycles and therfore, to protect the steel piles against corrosion, you use a cathodic reaction to eliminate the rusting that otherwise would take place. There is some problems with this system just like many others, first and foremost, this system does not yield any lateral stability when used to support foundations for the purposes of settlement or differential settlement. Furhter, the depth of system is critical in that if it does not penetrate into rock, it will have a tendency to move downward and outward,laterally, depending on the soil condition especially if it is used in fill condition as I have experienced. Note, this pile system is somewhat comparable to Chance anchors in terms of utilization to support foundation that are subject to differential settlement. If there are no issues with hillside condition and lateral expansion of fill soils, the system might work well if maintained. Remember, you are counting on electrical wires to propmote the cathodic reacation provided you have a controlled environment not subject to damage by others or other factors. Hope I answered your question. Samir Y. Ghosn, PE Harris & Associates At 10:53 AM 11/19/2002 -0800, you wrote: >Have you heard of the electro stabilization of soils? Apparently the rows >of small diameter holes are drilled into the ground and are filled with a >special solution, then cathodes and anodes are inserted in them and the >pulsating and sign alternating current is released. Basically, charged soil >particles (ions) travel between cathodes and anodes and various chemical and >electro-chemical processes occur (if memory doesn't fail me - electrolysis, >eletrosomosis and electrophoresis (sp?)). As a result, the soil around and >between cathodes and anodes becomes practically watertight and rock hard >with compressive strengths of up to 5 - 7 MPA > >I remember that in rural areas of Russia they used this method for parking >lots where they stored heavy agricultural equipment (no concrete or asphalt >paving). The area stayed rock hard and dry through months of heavy rains. > >Sasha Itsekson, SE > >-------------------------------------------------------------- >From: "Eric Green" <EGreen(--nospam--at)walterpmoore.com> >To: <seaint(--nospam--at)seaint.org> >Subject: RE: Have you heard of watering your foundation? > >This is a multi-part message in MIME format. > >----=_NextPart_ST_16_04_43_Monday_November_18_2002_20411 >Content-Type: text/plain; > charset="us-ascii" >Content-Transfer-Encoding: quoted-printable > >I have heard it as gospel that lime does not work for structural >foundations, despite the fact that the highway guys seem to think it >works quit well. I think the real issue might be cost rather than >performance. The depth to constant moisture content in Houston is >typically 8-14 feet, but of you could stabilize the upper 5-6 feet you >would get rid of most the movement. The clay itself goes down 4000 - >6000 feet (in Houston), so piles to bedrock are a relatively expensive >option. > >=20 > >Eric Green=20 ******* ****** ******* ******** ******* ******* ******* *** * Read list FAQ at: http://www.seaint.org/list_FAQ.asp * * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to: * * http://www.seaint.org/sealist1.asp * * Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********
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