>FastSetT Non Shrink Grout by Quikrete at Home Depot.
When I put my tower up 25 years ago, I could'nt find any "non-shrinking
grout" locally. The store sales clerks didn't even know what I was talking
about. I needed only a small amount for the job, so I took some standard
Quickrete concrete mix from a partially used bag I had on hand, and used a
sledge hammer to break up the gravel into small enough pieces to fit easily
under the tower base plate and allow the mix to thoroughly surround the
levelling bolts. I re-mixed the pulverised concrete mix and shoved it in
place with a wooden stick and trowel, which worked perfectly, and after all
this time I see no evidence of shrinkage or deterioration from water getting
under the base plate. There was only about a 5/8" gap under my base plate
and the base plate itself is about 5 inches square - part of the base
insulator assembly salvaged from an old broadcast tower, that I used with my
Rohn 25, so I doubt there would be visible shrinkage in any case. The grout
should do two things: keep water from standing around the bolts, and
eliminate the possibility of the bolts loosening and backing away from the
initial adjustment. I don't think the grout is expected to bear any of the
load on the base plate.
Don k4kyv
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