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[TowerTalk] To grout or not to grout (tower leg bolts)

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Subject: [TowerTalk] To grout or not to grout (tower leg bolts)
From: (Terry Dunlap)
Date: Tue, 01 Apr 1997 22:18:40 -0700
At 09:59 PM 4/1/97 -0500, wrote:
>Grout is used frequently in commercial construction, there are several types
>available, I remember metallic and non-metallic as existing but forget why
>you want one or the other .  What grout is, is basically a very fine
>concrete, which will flow very the mixed grout will pour/run
>under your metal "feet" easily - it won't need to be forced to occupy the
>cavity under the steel.  It will take the weight once it sets up and serve to
>transfer it to the slab below it - rather than having your leg up on a
>"stilt." as it is now on the bolts.  Frequently grout is used under heavy
>machinery, the equipment is placed as you have done, onto threaded bolts -
>levelled, and then: its grout time.

The main structural difference between grout and concrete is that grout is
a non-shrink cementitous product.  This is true whether or not the grout is
metallic or non-metallic.  This allows the grout to be "installed" in it's
final position without it shrinking back during the setting process.  Most
grouts can be mixed so that they can be "flowed" under the baseplate or mixed
so that it can be "dry-packed" under the base plate or leveling fixture.  The
choice depends on your particular application.  Normally, metallic grout is
used in "repetitive motion" applications such as machinery with considerable
vibration.  I don't believe that a tower would require this type.

73 de Terry KK6T

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