On 10/12/14, 12:23 PM, Ray, W4BYG wrote:
While I don't have detailed specifications, I know from experience
heating drug store sulphur to a liquid and pouring it into such holds
provides an extremely strong bond to the the bolts and concrete. As
the molten sulphur cools, it expands and locks into the hole and around
the bolt.
The process is quite easy although smelly, during the heating. I used
an inexpensive smelting pot and a butane torch. The result was an very
good bond for guy anchors holding up a 70' tower with a Mosley S-402 40
meter beam on top and a CL-36 tribander, 15' below. The cost is
virtually nothing.
I was clued into this by an old time professional machinist who told me
this was how they locked heavy, vibrating, machinery down. They never
had a failure, nor did I.
Ray, W4BYG
I was thinking about this on the drive into work this morning. Sulfur
used to be a way to do things like installing parking meters (which need
to be secure, but also replaceable, because people back over them).
I don't know how strong it is, though.
$50-60 for a 50 lb sack/pail, which makes it substantially more
expensive than redimix concrete in sacks. However, probably a lot
cheaper than epoxy.
$500/metric ton in 10 ton lots..
There are also wedgelock bolts designed to mount in holes.
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