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RE: Low Concrete Quality

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Just a question about the use of silica fume. Isn't silica fume an admixture
that increases durability and provides significant strength gains in
concrete?  I thought it was one of the key ingredients in high strength
concrete and would be a bit skeptical of the contractor's claim of use of
this admixture since you're getting concrete in the range of 2000-2500 psi.

Michael Lo, P.E. 
Structural Department
Einhorn Yaffee Prescott - NYC 
440 Park Avenue South 
New York, NY 10016 
Tel:(917) 981-6024 
Fax:(917) 981-6100 

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