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Re: seaint Digest for 14 May 2012

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Greg
We are not talking high tech here. Any boob with a drill & a caulking gun can do this.
Chuck Utzman,PE
On 5/15/2012 12:00 AM, admin wrote:
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                        seaint Digest for 14 May 2012

Topics covered in this issue include:

    1: seaint Digest for 13 May 2012
              by "admin"<admin(--nospam--at)seausa.org>
    2: Re: seaint Digest for 12 May 2012
              by Kembcon<engineers(--nospam--at)kembcon.com>
    3: RE: Concrete Crack Repair
              by "Michel Blangy"<mblangy(--nospam--at)satco-inc.com>



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From: "gregory szuladzinski"<ggg(--nospam--at)bigpond.net.au>
To:<seaint(--nospam--at)seaint.org>
Subject: Re: seaint Digest for 13 May 2012

Harold,
Re: Concrete crack repair.

Now I am convinced that epoxy might be a better way.
But not for everybody.
I represent a small project mentality,
because those were the only ones I happened to manage.
Yes, I know you could probably find such specialized
technicians. But it would take a week to get them to site
and the minimum would be $1000, if not more.
It then becomes tempting to use your own labor force,
because of instant gratification.

SIncerely
Gregory from Oz


----- Original Message -----
From: "admin"<admin(--nospam--at)seausa.org>
To:<ggg(--nospam--at)bigpond.net.au>
Sent: Monday, May 14, 2012 5:00 PM
Subject: seaint Digest for 13 May 2012


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                       seaint Digest for 13 May 2012

Topics covered in this issue include:

   1: Concrete crack repair
             by ggg(--nospam--at)bigpond.net.au<BR>To: seaint(--nospam--at)seaint.org<BR>Subject:
Concrete crac=



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1                                Message:0001                            1
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From: Harold Sprague<spraguehope(--nospam--at)hotmail.com>
To:<seaint(--nospam--at)seaint.org>
Subject: RE: Concrete crack repair

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Gregory=2C
=20
The drilling at the ends are good for repairing metals with small cracks
th=
at are primarily induced from fatigue.  The drilling eliminates the stress
=
riser and mitigates crack growth propagation.
=20
High grade construction epoxies for concrete repair have excellent bonding
=
characteristics and very high strengths in compression=2C peel=2C tension=
=2C and shear.  Compression strengths are 15=2C000 psi plus.  Epoxy resins
=
can be used for concrete structural repairs very effectively.  For sealing
=
for water penetration and active cracks=2C it is recommended to use a
polyu=
rethane as opposed to an epoxy. =20
=20
Check out ACI RAP Bulletin 1=2C Structural Crack Repair by Epoxy
Injection.
http://www.concrete.org/general/RAP-1.pdf
and
The US Bureau of Reclamation Guide to Concrete Repair.
http://www.usbr.gov/pmts/materials_lab/repairs/guide.pdf
=20
The US Bureau of Reclamation Guide is good because it provides guidance on
=
when to use epoxy injection and when to use polyurethanes. =20

Regards=2C Harold Sprague
=20



From: ggg(--nospam--at)bigpond.net.au
To: seaint(--nospam--at)seaint.org
Subject: Concrete crack repair
Date: Sat=2C 12 May 2012 17:39:24 +1000




Having a modest building experience=2C let me ask this of our learned
colle=
agues=2C
especially Harold.
=20
Epoxy=2C I understand=2C is good for sealing=2C but does not have a big
str=
ength itself.
Why not=2C instead=2C do the following:
=20
1. Drill thru the ends to prevent further growth.
2. widen the mouth using a small dia grinder
3. Fill with any good putty. They often fuse with parent concrete
and offer almost continuous material.
=20
Sincerely
Gregory from Oz
       =

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<body class=3D'hmmessage'><div dir=3D'ltr'>
Gregory=2C<BR>
&nbsp=3B<BR>
The drilling at the ends are&nbsp=3Bgood for repairing&nbsp=3Bmetals with
s=
mall cracks that are primarily induced&nbsp=3Bfrom fatigue.&nbsp=3B The
dri=
lling eliminates the stress riser and mitigates crack
growth&nbsp=3Bpropaga=
tion.<BR>
&nbsp=3B<BR>
High grade construction epoxies for concrete repair&nbsp=3Bhave
excellent&n=
bsp=3Bbonding characteristics and very high strengths in compression=2C
pee=
l=2C tension=2C and shear.&nbsp=3B Compression strengths are 15=2C000 psi
p=
lus.&nbsp=3B&nbsp=3BEpoxy resins&nbsp=3Bcan be used for concrete
structural=
repairs very effectively.&nbsp=3B For sealing for water penetration and
ac=
tive cracks=2C it is recommended to use a polyurethane as opposed to an
epo=
xy.&nbsp=3B<BR>
&nbsp=3B<BR>
Check out<FONT face=3DHelvetica-Condensed-Oblique><FONT
face=3DHelvetica-C=
ondensed-Oblique><FONT face=3DHelvetica-Condensed-Oblique><FONT
face=3DHelv=
etica-Condensed-Oblique>ACI</FONT></FONT>  RAP Bulletin 1=2C
</FONT></FONT><=
FONT face=3DHelvetica-Bold><FONT face=3DHelvetica-Bold>Structural Crack
Rep=
air by Epoxy Injection.</FONT></FONT><BR>
<A
href=3D"http://www.concrete.org/general/RAP-1.pdf";>http://www.concrete.o=
rg/general/RAP-1.pdf</A><BR>
and<BR>
The US Bureau of Reclamation Guide to Concrete Repair.<BR>
<A
href=3D"http://www.usbr.gov/pmts/materials_lab/repairs/guide.pdf";>http:/=
/www.usbr.gov/pmts/materials_lab/repairs/guide.pdf</A><BR>
&nbsp=3B<BR>
The US Bureau of Reclamation Guide is good because it provides guidance on
=
when to&nbsp=3Buse epoxy injection and when to use polyurethanes.&nbsp=3B
<=
BR><BR>Regards=2C Harold Sprague<BR>&nbsp=3B<BR>
<DIV>
<DIV id=3DSkyDrivePlaceholder></DIV>
<HR id=3DstopSpelling>
From: ggg(--nospam--at)bigpond.net.au<BR>To: seaint(--nospam--at)seaint.org<BR>Subject: Concrete
crac=
k repair<BR>Date: Sat=2C 12 May 2012 17:39:24 +1000<BR><BR>
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<DIV>Having a modest building experience=2C let me ask this of our learned
=
colleagues=2C</DIV>
<DIV>especially Harold.</DIV>
<DIV>&nbsp=3B</DIV>
<DIV>Epoxy=2C I understand=2C is good for sealing=2C but does not have a
bi=
g strength itself.</DIV>
<DIV>Why not=2C instead=2C do the following:</DIV>
<DIV>&nbsp=3B</DIV>
<DIV>1. Drill thru the ends to prevent further growth.</DIV>
<DIV>2. widen the mouth using a small dia grinder</DIV>
<DIV>3. Fill with any good putty. They often fuse with parent
concrete</DIV=
<DIV>and offer almost continuous material.</DIV>
<DIV>&nbsp=3B</DIV>
<DIV>Sincerely</DIV>
<DIV>Gregory from Oz</DIV>
&nbsp=3B<BR></DIV>       </div></body>
</html>=

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2                                Message:0002                            2
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From: Kembcon<engineers(--nospam--at)kembcon.com>
To: seaint(--nospam--at)seaint.org
Subject: Re: seaint Digest for 12 May 2012

Gregory:

The epoxy is generally stronger than the concrete.   The problem with
patching cracks with epoxy it that if the cause of the cracks is
ongoing, the concrete will crack again parallel to the epoxy patch.  So,
fix the cause of the cracks, then the epoxy can seal everything up
"better than new".  Putty ain't structural. / eric

P.S. Note that I deleted all the extraneous junk that this server puts
in to these replys...sure would make it easier to follow the threads if
everyone did this....

On 5/13/2012 12:00 AM, admin wrote:
Topics covered in this issue include:

     1: Concrete crack repair
               by "gregory szuladzinski"<ggg(--nospam--at)bigpond.net.au>



--------------------------------------------------------------------------
1                                Message:0001                            1
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From: "gregory szuladzinski"<ggg(--nospam--at)bigpond.net.au>
To: "Sseaint Org"<seaint(--nospam--at)seaint.org>
Subject: Concrete crack repair

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BlankHaving a modest building experience, let me ask this of our learned =
colleagues,especially Harold.

Epoxy, I understand, is good for sealing, but does not have a big =
strength itself.
Why not, instead, do the following:

1. Drill thru the ends to prevent further growth.
2. widen the mouth using a small dia grinder
3. Fill with any good putty. They often fuse with parent concrete
and offer almost continuous material.

Sincerely
Gregory from Oz







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3                                Message:0003                            3
--------------------------------------------------------------------------
From: "Michel Blangy"<mblangy(--nospam--at)satco-inc.com>
To: "Seaint(--nospam--at)Seaint.Org"<seaint(--nospam--at)seaint.org>
Subject: RE: Concrete Crack Repair

List,

I've written my spec for the crack. Thanks to all who replied. After
speaking with the material supplier's technical representative, I decided on
a lower viscosity gel type epoxy. In addition to specifying that the
supplier's recommended procedures be adhered to, I felt it was important to
specify that a plural component dispensing pump must be utilized, that ports
be spaced no more than the wall thickness, and that the work be carried out
by contractor qualified by the material supplier's representative. I think
this should eliminate the chance of my goofy general bungling the job..

Michel




List,

I'm looking for suggestions on methods of repairing a through crack in the
stem portion of a 6-foot long slot segment of a cantilevered concrete
retaining wall. The 1/8-3/16" wide crack extends the full length at about
mid-height and was caused by an impact near the top from a ginormous
bulldozer on the toe side.

Thanks,

----------------------
Michel Blangy, P.E.



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*   Read list FAQ at: http://www.seaint.org/list_FAQ.asp
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