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Re: Substitute concrete for grout?

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Keep in mind that technically grout is concrete.  It is just concrete with
a large slump and thus rather high water to cement ratio.

To my knowledge, there is nothing that specifically disallows the use of
concrete in filling reinforced CMU cells (if so, then technically grout
would not be allowed either).  The MSJC specification (ACI 530.1/TMS
602/ASCE 6-05) does state in Article 2.6B.2:

"Unless otherwise required, mix grout to a consistency that has a slump
between 8 and 11 in."

Article 2.6B.1 states:

"Unless otherwise required, proportion and mix grout in accordance with
the requirements of ASTM C 476."

In the end, grout is just concrete that is "flowable" enough to properly
fill voids without undue segregation.  This is typically done with high
slumps.  Thus, grout is just typically a VERY wet concrete (but with
typically smaller aggregate than "typical" concrete...i.e. rare to get
aggregate greater than 3/8" for course grout).


Adrian, MI

On Mon, 26 Feb 2007, Will Haynes wrote:

> I seem to remember that ACI does not allow you to substitute concrete for
> grout when filling reinforced cmu cells, having something to do with the
> water absorption from the grout into the units. But I can't find where this
> is stated. Does anyone know if this is correct?
> Will Haynes, P.E.

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