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Re: Placing Concrete in Vault

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Lehigh University's 3-dimensional ATLSS facility was constructed with
walls 3 and 4 feet thick.   The concrete specs called for 1/2 inch
aggregate and a slump of 9-10 inches.   Water cement ratio was not
compromised by the use of super-plastizer products and technical support
from Master Builders.    Twenty-eight day strengths averaged ~8500
psi.    Steel forms were used with external vibration.   Concrete was
pumped UP into the walls in ten foot lifts through "gate-valve" fixtures
made from modified sections of metal form.  Dr. John E. Bower at the
ATLSS facility in Bethlehem, Pennsylvania can give you more details.


Best Regards,

Peter  De Vere
JSC Houston, Texas