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Tool Talk Discussion Forum

Dobies

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Slowpoke

10-03-2003 14:07:54




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I want to make the 3x3x3 concrete blocks (Dobies) that support rebar when pouring concrete. I didn't notice any stones in the commercialy made blocks. It looks like the material used in 16" building blocks.
Does anyone know the mix formula for the blocks (either kind)?
Thanks in advance
Slowpoke




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RJ-AZ

10-03-2003 18:22:53




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 Re: Dobies in reply to Slowpoke, 10-03-2003 14:07:54  
For what you want to do use 7 sand to 1 portland cement. How are you going to form them. I have used broken concrete block for supporting rebar or remesh. You can even bulk pour them and score them out with a trowel and crack em out when the cement sets.



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Slowpoke

10-03-2003 21:27:48




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 Re: Re: Dobies in reply to RJ-AZ, 10-03-2003 18:22:53  
RJ....I've made a 70 block form with 16ga dividers between tapered 2x3s. They will be slightly wider at the bottom and have wire ties in the top. I'll have to use old engine oil to keep them from sticking. Current price is about 35� ea at the yard. I need about 1000-1500.
I will try your idea of a bulk pour. Maybe I can figure out a way to cut them with lengths of mig wire. Thank for the help

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big fred

10-04-2003 17:25:26




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 Re: Re: Re: Dobies in reply to Slowpoke, 10-03-2003 21:27:48  
If you can make them cheaper than 35 cents, you're making way less than minimum wage. When I poured my foundation I used brick, and could make two outa one brick. Bricks cost about 25 cents at that time. Building inspector approved it, in fact he's the one that gave me the idea.



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Slowpoke

10-07-2003 11:01:15




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 Re: Re: Re: Re: Dobies in reply to big fred, 10-04-2003 17:25:26  
How can the brick be fastened to the rebar/wire?
With people walking over it to place the cement I would think the bricks would get knocked out of place. My base is sand and things move easily on it when hit with a foot. My dobies will have wire ties in them.



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big fred

10-08-2003 07:33:24




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 Re: Re: Re: Re: Re: Dobies in reply to Slowpoke, 10-07-2003 11:01:15  
In my case I was pouring footings, so it wasn't an issue, but if you used 3-hole bricks you could easily wire the rebar to it. You'd have to add the cost of the wire to the cost of the brick, though. Regardless how you do it, good luck with your pour, sounds like you got a huge job ahead of you. I never did like concrete work.



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Slowpoke

10-08-2003 12:56:58




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 Re: Re: Re: Re: Re: Re: Dobies in reply to big fred, 10-08-2003 07:33:24  
42x80 floor, 6" deep. The plans called for 4" with wire mesh, but I thought it would be too difficult to put the mesh down by myself and also I've heard that mesh seldom is pulled up to the center of the concrete. So I had the plans changed to 6" with fiber reinforcement.
After considering the weight of my forklift, I decided to go the 6" fiber with 1/2" rebar @ $2.63 ea. Two-three weeks ago the rebar shot up to $3.90 ea. I need 340 pcs. just for the floor.
Now I'm reconsidering the wire mesh, @ $82/1400 sq '. If I go with the rebar, I can use a couple thousand dobies.
I'm not sure if dobies are used with wire mesh.

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