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Re: High Strength barrier?

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Dear Jay,
First of all, we live in the Caribbean on a rather small island, so
getting special admixtures and pozzolans other than Super or retarder
is hard to come by.

We have a spec that requires 10 ksi.  Have mixes been made with just
cement and super, aggregates and water, and perhaps a retarder that
reach this strength?  Or what is the maximum that can be reached with
just these components?

This is my question.  I am not sure about the aggregate type, but lets
assume we have a good aggregate.

On 10/30/06, Jay Shilstone <j.s(--nospam--at)> wrote:

 All concrete mixes are "special" mixes, since they are tailored to a given

 Certain aggregates can't be used for high strength concrete, since they are
too dirty, have fracture planes, are too smooth or are too soft.

 Using straight cement limits your strength. Adding fly ash, slag or silica
fume will improve strengths.

 Admixtures can improve strengths.

 I believe the "barrier" you refer to from ACI is 6000 psi. Over that is
often considered high strength.

 The highest strength concrete used in production that I have heard of is
about 18,000 psi, but I have heard that some people have achieved on the
order of 30,000 psi in the lab. There is another entire class of concrete
made with special cements and processes that can achieve 70,000 psi.

 What is your purpose in asking this? Give us some more information and we
can give you a better response.

 Jay Shilstone

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