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Re: High Strength barrier?

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

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

At 04:23 PM 10/30/2006, you wrote:
What is the highest strength concrete without special mix design.  May
use Superplasticizers, and cement, water and aggregate.

Doesn't ACI have a barrier to which they defer to for design in case
of high strength concrete use?

James M. Shilstone, Jr., FACI                 jay2003.shilstone(--nospam--at)shilstone.com
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