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My Increasing Interest In Forming.

 
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Old 09-16-2011, 06:45 PM   #1
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My Increasing Interest In Forming.


Greetings, well lately i haven't been doing much framing so ive been looking at lots of highrise forming. any forming for that matter.

Anyway, i started a mini condo if u will, so i formed 4 columns in the corners on a piece of plywood and 2x4. I poured them and they were good. I did not want to build more columns so i went for a beam and slab construction on my slab. So i made it 2" thick on the edges and 1" in the centre. I formed it good and it held up to my pour. And it was easy to strip too.

#1 has to hold concrete
#2 Has to be easy to strip.

Blah blah, but when i got there this afternoon to inspect my new slab i saw some small cracks in the slab at the end by the beams. I thought wtf, maybe it dried to fast or whatever. So i commenced stripping. I wasn't specifically rough but the crack began to grow. I had it all stripped and and then i put a prop underneath the crack on each end. It failed. Just like i thought, i sort of thought that my random spewing of nails in the wet concrete would not be too good as rebar. As you can see from the pictures it did not even grab my columns, i forgot to put pins in the columns that would be used for this reason. I was looking at my peices of slab and it seamed that they were really weak, its weird, i mixed the concrete good and it seams the mix was ****y, my columns were good, But i will hold onto a piece and see if its stronger after 28 days or if it was my ****ty mix, I finished it good, but im going to make a wooden float for final finishing. Man, i have nothing to do now, I was going to build the next floor columns tonight and keep going.

Next time i try i will get some wire coat hangers and make cages
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My increasing interest in forming.-img_9836.jpg  
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Old 09-16-2011, 07:12 PM   #2
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Re: My Increasing Interest In Forming.


How many bags did that take?

Who is that tombstone for?

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Old 09-16-2011, 07:19 PM   #3
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Re: My Increasing Interest In Forming.


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How many bags did that take?

Who is that tombstone for?
i did that with hardly 1 bag



Im just looking for **** to build with concrete, i will fix my curb and if i could find some mouldings i could make a form for a decorative pilaster.

Im so ****ing weird
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Old 09-16-2011, 07:20 PM   #4
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Re: My Increasing Interest In Forming.


The formwork looks fine, it was the engineering that failed, lol, jk. A beam should fully sit on top of a column, Would you ever notch a 2x12 floor joist 6" and seat it in a hanger? That's essentially what ya did right there. It's also common practice to wait about a week before you strip anything that is horizontal and self supporting. For your application I would wait at least a couple days.

Go get some pencil rod, it's cheap and will hold your models together.
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Old 09-16-2011, 07:22 PM   #5
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Re: My Increasing Interest In Forming.


Your beams should terminate on top of the columns. A d your slab on the top of the columns is to thin. 1" of concrete is not structural enough. Next time instead of nails or rebar try chicken wire it should be enough to demonstrate what would happen.
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Old 09-16-2011, 07:26 PM   #6
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Re: My Increasing Interest In Forming.


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The formwork looks fine, it was the engineering that failed, lol, jk. A beam should fully sit on top of a column, Would you ever notch a 2x12 floor joist 6" and seat it in a hanger? That's essentially what ya did right there. It's also common practice to wait about a week before you strip anything that is horizontal and self supporting. For your application I would wait at least a couple days.

Go get some pencil rod, it's cheap and will hold your models together.
yea i noticed that i made a serious shear point, if anything i should have thickend it at that point. I could not wait a week, id probaby die. I was anxous
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Old 09-16-2011, 07:32 PM   #7
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Re: My Increasing Interest In Forming.


They do have fast setting concrete, it's about twice the price but for 9$ a bag I don't think it would break your budget on the build.
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Old 09-16-2011, 07:41 PM   #8
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They do have fast setting concrete, it's about twice the price but for 9$ a bag I don't think it would break your budget on the build.
im cheap , what do you think might have caused my cracks, but this mix seems to have been really ****ty. I mixed it good or so i thought
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Old 09-16-2011, 07:53 PM   #9
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Re: My Increasing Interest In Forming.


Those cracks are probably from no reinforcement. Starting out with concrete it's almost always best to mix concrete as dry as possible. Too much water will cause cracks and strength issues, You want it more like peanut butter then soup.

Easiest way to mix a sack mix is with a wheelbarrow and a mixing hoe, it's like a garden hoe but has two holes in it, or just a shovel folding it over and over. It should be thick enough to where you can't really mix it properly in a bucket with a drill mixer.
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Old 09-16-2011, 09:25 PM   #10
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Re: My Increasing Interest In Forming.


Problem #1, poor consolidation of concrete, you show some honey combing in one of the pics, Problem #2, the thinning of the slab at the main pressure points, 1" over the columns and then thickening the slab to 2" everywhere else. Concrete is heavy man!!! Problem, #3 Columns are too thin, if it were a 3" by 3" columns, with a flared top to let's say 5" by 5" the increased surface area would help support the weight of the slab. Any notches and outcropping are seriously reinforced with rebar and mesh as well as higher MPA concrete with water reducers and such. Neat project, i might give it a go.
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Old 09-16-2011, 09:51 PM   #11
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Re: My Increasing Interest In Forming.


Get your act together and make some garden furniture that won't blow away.

How about some utility poles? Throughout eastern europe they used to have concrete utility poles. Ugly.

As expensive as corner posts are now, and you can't get a decent diameter, it may be nice to make some out of concrete. I figure you could burn your fence rows this way and not worry about your posts.
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Old 09-17-2011, 07:04 PM   #12
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Re: My Increasing Interest In Forming.


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Problem #1, poor consolidation of concrete, you show some honey combing in one of the pics, Problem #2, the thinning of the slab at the main pressure points, 1" over the columns and then thickening the slab to 2" everywhere else. Concrete is heavy man!!! Problem, #3 Columns are too thin, if it were a 3" by 3" columns, with a flared top to let's say 5" by 5" the increased surface area would help support the weight of the slab. Any notches and outcropping are seriously reinforced with rebar and mesh as well as higher MPA concrete with water reducers and such. Neat project, i might give it a go.
i was did not flare the top because i was lazy to cut those mitres and it was on corner. Yea im going to get my sander put it in a bag and use it as a vibrator. I think it cracked because it was loaded for whatever reason before it cured
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Old 09-17-2011, 07:27 PM   #13
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Re: My Increasing Interest In Forming.


Rebar bud...It does wonders
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Old 09-17-2011, 07:30 PM   #14
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Rebar bud...It does wonders

whats rebar , see i am interested in forming
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Old 09-17-2011, 07:31 PM   #15
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Re: My Increasing Interest In Forming.


Freakin' amazing watching this kid. It's like reliving my past. He's going to be a cabinet maker any day now
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Old 09-17-2011, 07:32 PM   #16
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Re: My Increasing Interest In Forming.


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whats rebar , see i am interested in forming
rebar is the golden egg.
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Old 09-17-2011, 07:35 PM   #17
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Re: My Increasing Interest In Forming.


Great men aren't afraid to make mistakes. They're smart enough to learn from them!
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Old 09-17-2011, 07:39 PM   #18
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Re: My Increasing Interest In Forming.


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whats rebar , see i am interested in forming
Head downtown after school, Dupont & Davenport starting footings on the 27th
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Old 09-17-2011, 07:45 PM   #19
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Head downtown after school, Dupont & Davenport starting footings on the 27th
on a house?
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Old 09-17-2011, 07:45 PM   #20
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Re: My Increasing Interest In Forming.


look for a cattle panel at a farm store, or maybe some scrap 6-6/10-10

Make your mom a nice bench or table

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