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Re: Concrete Boonding Agent (was: Caisson cold joint)

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If there is a risk of messing up with the use of bonding agent, don't use it.

If water is trapped, pump it out.  In uncased caisson, jetting would only remove loose concrete from the edges etc. It is difficult to foresee the collapse of the entire caisson.


Roger Davis <sds_rdavis(--nospam--at)> wrote:
A bonding agent becomes a method of ensuring there is no bond if done incorrectly and it is easier to do incorrectly than correctly.  I would worry about using a water jet on a caisson. If it is cased, the water will be trapped and if it is not cased, it might cause the soils around the partially completed caisson to collapse.
Roger Davis
SDS Architects, Inc.

Paul Ransom <ad026(--nospam--at)> wrote:
> From: Padmanabhan Rajendran

> I don't have a problem with the suggested method of caisson construction.
> I would stipulate, however, that top of the first stage concrete is
> cleaned with water jet(to remove all loose material and to expose coarse
> aggregate) and a concrete bonding agent applied, before placing concrete
> for the last 4' of caisson.

I have encountered a concrete bonding agent specified on one project in
my career. Nobody on the site could explain to me why it was being used,
except that it was in the spec. Technically, I know what they do and I
know what characteristics they can develop across the interface. Perhaps
somebody can fill me in on the primary application and marketed purpose
of the product (the two may not be the same). Pros and cons? Anecdotes?

R. Paul Ransom, P. Eng.
Burlington, Ontario, Canada

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Roger Davis
SDS Architects, Inc.

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