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Concrete Compressive Strength Predictions

Concrete Compressive Strength Predictions

Concrete Compressive Strength Predictions

(OP)
I am wondering if anyone knows how to predict the 28 day compressive strength of concrete, without using a 7 or 14 day break to guide you along.  I am most interested in trying to use differential equations to model the behavior of concrete as several variables change from batch to batch.  The variables I am most interested in are slump, air entrainment and the temperature of the mix.

RE: Concrete Compressive Strength Predictions

There are so many variables, dleonard, I think this would be an exercise in futility.  Consider first the aggregate.  In order to have good compressive strength strength, one must have competent aggregate.  There is a soundness test, gradation, possibly LA abrasion, clay content, elongate particles...you get the idea- there are just so many possible variables.  Not to mention the water content, type of cement...egads.  
On the other hand, , I had an...associate, that over the course of a summer tracked exactly the variables you speak of v. compressive strength on one project with a single supplier.  I don't remember the specifics, but I do believe there were some general trends.  I could get you in touch with him.  A good general rule is higher air, lower compressive strength- the others I could only guess.  Let me know if you're interested.  These would be, of course, for only one plant and one locality.  I remember thinking at the time that it was, if nothing else, extremely good record-keeping.             :)

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