[TowerTalk] Concrete Fiber
TexasRF@aol.com
TexasRF at aol.com
Mon Oct 17 12:25:28 EDT 2005
This sounds like a version on concrete mix sold around here called
"Maximizer" I notice on the bag it claims to yield a somewhat higher volume of
concrete per bag of mix. This higher volume comes at a cost of less weight per cubic
foot of concrete. Since we are basically using the weight of the concrete to
keep the tower base in place, it seems to be a good idea to use the original
mix and get all of the expected concrete weight.
73,
Gerald K5GW
In a message dated 10/17/2005 11:16:33 A.M. Central Daylight Time,
kr7x at comcast.net writes:
Doug:
Fiber reinforced concrete is not, in my professional opinion, going to
provide any advantage in real terms for its additional cost for a tower
foundation. The biggest benefit it would provide in foundation usage is improved
shrinkage crack control.
It does provide some benefit when used in slabs and floors. It really does
not improve the load resistance of a tower type foundation whether a spread
footing, drilled pier or other.
Regards
Lonberg Design Group, Ltd.
Hank Lonberg, P.E.,S.E. / KR7X
President
-------------- Original message --------------
> I'm about to order concrete for a tower base. The concrete company offers
> fiber reinforcement mixed into the concrete for about $10 per cubic yard.
> I've researched concrete fiber and found nothing on Tower Pro and only one
> comment here by K7LXC saying it wasn't needed.
>
> It appears that the fiber adds 5-10% additional compressive strength and
> about results in a 50% reduction in cracking. (it is touted as a
replacement
> for embedded steel mesh in slabs.)
>
> I have been unable to find any literature indicating that it is
> inappropriate for tower bases or even any negative consequences of its use
> for such. For less than a 10% increase in the cost of the concrete, it
seems
> like it may be worth it- even if only for a belt and suspenders approach.
>
> Does anyone have any experience with concrete fiber use in tower
> foundations?
>
> Tnx,
> Doug
> K4DDR
>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather
> Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions
> and ask for Sherman, W2FLA.
>
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_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
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