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Re: Gas Tight Seal[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: Gas Tight Seal
- From: jannett(--nospam--at)gpu.com
- Date: Fri, 23 Oct 1998 16:31:13 -0400
I agree with your thoughts that you will essentially need to create an expansion joint with a flexible sealant cap that will be air-tight. ACI 504 provides details of typical joints. I don't have my caulking literature anymore but there were a number of silicone caulks that would be suitable for adhesion between old and new concrete surfaces. I think that you'll probably end up with a filler material (it could probably double as the bearing pad you mentioned originally) and a bond breaker. Whenever I've called a caulk manufacturer they have had a lot of data. You should also know how much movement and rotation that may occur at the joint for selecting the material as well as sizing the joint. A number of caulks have been qualified in the nuclear industry for penetration sealants when subjected to differential pressures after a steam line break. "Randy Russ" <rruss(--nospam--at)eatel.net> on 10/22/98 07:58:47 PM Please respond to seaint(--nospam--at)seaint.org To: seaint(--nospam--at)seaint.org cc: (bcc: James H Annett) Subject: Re: Gas Tight Seal The deck will be cast against the wall as a cold joint (i.e. simply connected). I have a good coating system for the new concrete, I am concerned about gas escaping through the cold joint. The digester does produce gases and therefore a pressure differential across the joint. The purpose of the seal is for odor control. I am considering notching the top of the existing concrete wall and applying a flexible sealant. I am searching for a product or products to use. Randy Russ, P.E. ---------- > From: jannett(--nospam--at)gpu.com > To: seaint(--nospam--at)seaint.org > Subject: Re: Gas Tight Seal > Date: Thursday, October 22, 1998 1:38 AM > > > How will the slab edge will be placed against the top of the wall? How are > you defining gas tight, e.g., is there a difference in pressure across the > seal and how much leakage is acceptable? > > If the differential pressure is significant and if the allowable leakage is > supposed to be small, it will be difficult to do this with only concrete. > I've had enough trouble with air tight seals on steel doors & airlocks with > rubber gaskets. > > > > > > > "Randy Russ" <rruss(--nospam--at)eatel.net> on 10/21/98 10:02:28 PM > > Please respond to seaint(--nospam--at)seaint.org > > To: "Structural Chat" <seaint(--nospam--at)seaint.org> > cc: (bcc: James H Annett) > Subject: Gas Tight Seal > > > > > I am putting a concrete roof on an existing wastewater digester. I am using > a center column for the roof and am simply resting the slab edge on the top > of the esisting wall on a bearing pad. > > I am concerned with gas escaping. Do I need to provide any type of gas > tight seal or is the weight of the 18 inch roof slab enough.Has anyone > encountered this situation? > > Randy Russ, P.E. > > > > > > > > > >
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