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I am an engineer with a question about biotite and its effect in aggregates used in concrete.

0 votes
I am an engineer with a question about biotite and its effect in aggregates used in concrete. I haven't found any real evidence that its 'bad' but apparently it can be if the overall volume in the aggregate is too much. The question is, what is too much? Any help would be greatly appreciated. As a reference, I was questioned about a concrete mix design that had 5-10% biotite in the aggregates. Thanks again.
asked Nov 13, 2015 by KUssery (120 points)

1 Answer

0 votes
Your question is overly technical, but my presumption would be that too much biotite would indeed be a problem in concrete due to its crystal habits. Biotite is a phyllosilicate, meanting its tetrahedral structure forms in parallel sheets. These sheets can leave open voids with a crystal layer and aborb. So I would assume to much absorption could lead to a problem.
answered Nov 24, 2015 by hershel (47,740 points)
Thank you very much for your response!
 


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