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Re: BOLT- Epoxy Anchors

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Gill Chris wrote:
> SInce I work for Hilti I am, of course, not biased on this subject at
> all.  However, I will throw in my two cents worth.  First, the HVA
> system is just one type of adhesive anchor.  Epoxies are also used as
> adhesive anchors, but the HVA is not technically an "epoxy anchor."
> There are many different materials out there that are marketed for
> anchoring.  Some have very good resistance to temperature changes and
> weathering, others do not.  Many properties of the materials effect
> these charachteristics- Modulus of Elasticity, Heat Deflection
> Temperature, Elongation at break.  Epoxy products, for example, tend to
> have a low heat deflection temperature which may effect their ability to
> withstand higher temperatures.  In order to save everyone from having to
> sort out all of these material properties, ASTM has published "Standard
> Test Methods for Testing Bond Performance of Adhesive -Bonded Anchors",
> ASTM E-1512-93.  Several tests outlined in this standard deal with
> in-service conditions.  Probably the best one for your question is
> section 7.9, Tests for the effects of freezing and thawing conditions.
> The test subjects submerged anchor samples to 50 cycles of a 114 degree
> temperature swing (from -10 F to 114 F.)  The samples are then tension
> tested and compared to baseline (room temperature) samples.
> The bad news is that this standard is that it is a test standard only,
> not a performance standard.  So you or someone else has to evaluate the
> results and decide if they are acceptable.  We have been doing these
> types of tests for a long time on our adhesive anchoring products, and
> have a good feel for their performance.  The HVA system, for example,
> performs very well under freeze-thaw conditions, as well as other
> enviornmental tests like long-term creep at elevated temperatures.
> If you are looking for something more independent, ICBO ES has adopted
> an acceptance criteria for Evaluation Reports for adhesive anchors known
> as AC 58.  Part of the criteria provides pass/fail requirements for the
> various ASTM E 1512 enviornmental tests, including freeze-thaw and creep
> at elevated temperatures.  If a product does not pass, for example, the
> very freeze-thaw requirements, then it will be restricted to interior or
> protected locations.  Unfortunatley, only the very latest reports
> (within the last year or so,) were evaluated under AC 58.
> The bottom line is that any reputable manufacturer should have already
> performed these types of tests before introducing a product to the
> market. They should be able to provide the data.  If they hold an ICBO
> report, you should ask them if it was evaluated in accordance with AC
> 58.  (Our report for HVA, No. 4016 for example, was not, because AC 58
> was not in existence when the report was done.)  ICBO is requiring that
> certain enviornmental tests be done even on existing "old" reports, but
> this process is not complete.  It is probably best to just call the
> manufacturer and ask.  Even if they do not have a new ICBO report, they
> should be able to provide the data.
>         Please feel free to contact me directly if you need more
> inforamtion.
>         Chris Gill
>         Hilti, Inc.
>         Manager of Field Engineering
>         gillchr(--nospam--at)
> > ----------
> > From:         rlewis(--nospam--at)[SMTP:rlewis(--nospam--at)]
> > Sent:         Monday, October 20, 1997 1:24 PM
> > To:   seaoc(--nospam--at)
> > Subject:      BOLT- Epoxy Anchors
> >
> > I haven't seen much in the way of published literature on this subject
> > so I
> > want to pose the question to the list server.  I am considering using
> > epoxy
> > anchor like Hilti's HVA Adhesive System anchors.  The Contractor on
> > one of my
> > projects missed one of the column anchor bolt location by about 9
> > inches.
> > Not much to do now except drill in new anchors.
> >
> > My question concerns the longevity and proposed application of epoxy
> > anchors.
> >  How long are they expected to last.  Specifically, my column is
> > located
> > outside the building and wrapped in masonry.  It will be exposed to
> > the
> > seasonal temperature variations of Dallas, TX.  Does normal seasonal
> > temperature variation affect the anchor bond?  Are there published
> > limitations to the use of epoxy anchors?
> > __________________________________________________
> >
> > Richard Lewis, P.E.
> > Missionary TECH Team
> > rlewis(--nospam--at)
> >
> > The service mission like-minded Christian organizations
> > may turn to for technical assistance and know-how.
> >
> >
> >
Great information!!!!!! Thank you  Jim Adams