Hiya Pat,
Nope. With a slab on grade we didn't need any rebar anywhere other than the
outside 1' of the foundation. Me being the ol' farm boy that I am and doing
the work myself put in rebar on 3' centers anyway.
I figured that with the rebar and the fiber (and I screwed up and ended up with
an average of 5 1/2 to 6 1/2 inches thick) I'd never have to worry about the
base of the house moving!
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message -----
From: Pat Thurman
To: Marlon K. Schafer (509) 982-2181
Sent: Monday, June 19, 2006 8:03 AM
Subject: Re: [TowerTalk] Vibrating Concrete...
Hi Marlon,
Just curious, but were you told that microfiber would replace conventional
reinforcement? By that I mean, were you told that if you used microfiber that
you wouldn't need to use any standard reinforcing bars/mesh for your home
addition slab?
73, Pat K7KR
Marlon K. Schafer (509) 982-2181 wrote:
Grin,
Too true Dino!
I did manage to pour 4 trucks full of concrete last year. All with
microfiber in it.
What I was told was that it would do nothing to stop the cracking. This has
proven to be quite true. My 25x35 slab for a house addition is cracked all
over. Pouring in 100* weather is bad. Not leaving a sprinkler on it for a
week is worse!
Next time I'll try the "more concrete" idea.
What the fiber did do (and was claimed by the concrete guys) was to hold the
concrete together. This tendency was quite clear with little chunks that
were left on tools or forms. Hunks would come off but still be stuck
together nicely. It was actually quite impressive.
We did have a bit more trouble getting the finishing done as the fiber would
stick to the tools. Once the concrete set up a bit though, that problem
mostly went away and we were able to finish it just fine. And power
troweling worked just like normal. One note I'd make though, when you want
a nice smooth floor (like in a house) don't be afraid to run that power
trowel about twice as long as you'd think you'd have to. We should have hit
the floor 2 or 3 more times. I guess I'll have a nice surface for flooring
to stick to though :-).
laters,
Marlon
(509) 982-2181 Equipment sales
(408) 907-6910 (Vonage) Consulting services
42846865 (icq) And I run my own wisp!
64.146.146.12 (net meeting)
www.odessaoffice.com/wireless
www.odessaoffice.com/marlon/cam
----- Original Message -----
From: "Dino Darling" <dino@k6rix.com>
To: "K8RI on Tower talk" <k8ri-tower@charter.net>
Cc: <towertalk@contesting.com>
Sent: Sunday, June 18, 2006 10:07 PM
Subject: Re: [TowerTalk] Vibrating Concrete...
Roger asked;
What are your recomendations for vibrating "high fiber" concrete.
Hey Roger, I'm not a professional concrete guy, but I play one on TV,
AND slept at a Holiday Inn Express last night! :-) To answer you
question, "Add more water!"
I sold concrete tools for a few years and did all the demos. According
to the concrete guys, they saw no advantage to the fiber and it made
everything "furry". They still got cracks, etc. The old timers would
say, "Use more concrete if you want more strength."...or something to
that affect.
To be fair, the "engineers" state that FIBER is the best thing for
concrete and makes a world of difference! I have yet to be on a pour
where an engineer was ankle high in the mud or riding on the concrete
trowel machines with me. YMMV!
Dino - K6RIX
dino@k6rix.com
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