Egon
Epic Contributor
Are you going to add any colour to concrete when you cast your posts Lloyd?:thumbsup:
Concrete Posts.
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forgeblast
Elite Member
I was thinking, as i was driving to work, about a sculpture class i took.
You could buy one wooden post with the cut outs, and then use a mold material,
like smooth on 40, or some other casting material to make a flexable mold. This mold would pick up the grain of the wood and if you added the right color it would be stained during casting, making it look like a wooden post.
You could buy one wooden post with the cut outs, and then use a mold material,
like smooth on 40, or some other casting material to make a flexable mold. This mold would pick up the grain of the wood and if you added the right color it would be stained during casting, making it look like a wooden post.
EddieWalker
Epic Contributor
I don't think I would put anything in the post for holes. It's makes it too hard to get the post at the right height. It's real easy to drill holes in concrete with an SDS Rotary Hammer or a SDS Max. I have both, and for smaller holes under an inch, they either will do. You can even get cordless SDS Rotary Hammers that will do the job easily.
Set your posts and then drill where you need the holes.
Depending on how good you are at measuring depth of holes to set your posts, I might also make them about six inches longer then you need them, and cut them off after they are set. Just make sure not to put the rebar all the way to the top so you don't have to cut through it. A diamond masonary blade will go through it easily. It's loud and dusty, but real easy to cut. Then you can polish off the ends to look real nice with a grinding masonary grinding wheel on a 4 or 4 1/2 inch grinder. Might even bevel the edges for a real custom look.
Eddie
Set your posts and then drill where you need the holes.
Depending on how good you are at measuring depth of holes to set your posts, I might also make them about six inches longer then you need them, and cut them off after they are set. Just make sure not to put the rebar all the way to the top so you don't have to cut through it. A diamond masonary blade will go through it easily. It's loud and dusty, but real easy to cut. Then you can polish off the ends to look real nice with a grinding masonary grinding wheel on a 4 or 4 1/2 inch grinder. Might even bevel the edges for a real custom look.
Eddie
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Lloyd_E
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Thanks all...
I will do a drawing and get back to you. Eddie sounds like too much work
!
Later...
I will do a drawing and get back to you. Eddie sounds like too much work
!Later...
forgeblast
Elite Member
Just wondering would you cast them with rebar sticking out and then throw cement in the hole, or cast it as one unit and then just dirt back fill.
Also how would you support the rebar so that it doesnt sink through?
Also how would you support the rebar so that it doesnt sink through?
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Lloyd_E
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Forgeblast,
I just plan to back fill. I will probably need to put wire in concrete so I can haul them out. I am looking at release agents also. I assume the rebar will not sink due to the stiffness of the mix.
Mold Release Agents, Mold Release Agent Innovators, Releasing Agents, Compounds, Huron Technologies, Detroit, MI, Michigan
The attached pdf shows the followingage1 rough layout of 2x6 on 4"x8" plywood; Page2 showing portion in ground - large gray block - plus fence rails; Page3 fence rails only.
Dan, how big of a slot? My thoughts are if I am going to make a mould for smaller slots shouldn't I just enlarge them for the rails to go through? I assume on the back side of the slots would be a large backing plate or washer...
Not sure if I should add colour of not...
Do you think a heavy coat of rubber cement or contact cement would act as a release agent?
Or several coasts of varnish and maybe spray with oil...
The four circles represent 4 1/2" pvc pipe ganged together. This will give me a 2" vertical adjustment.
I am going to walk property and count posts but I think initially I will need around 180.
If I could cast 12 every 2 days it will take me 30 days to do the job.
I just plan to back fill. I will probably need to put wire in concrete so I can haul them out. I am looking at release agents also. I assume the rebar will not sink due to the stiffness of the mix.
Mold Release Agents, Mold Release Agent Innovators, Releasing Agents, Compounds, Huron Technologies, Detroit, MI, Michigan
The attached pdf shows the following
age1 rough layout of 2x6 on 4"x8" plywood; Page2 showing portion in ground - large gray block - plus fence rails; Page3 fence rails only.Dan, how big of a slot? My thoughts are if I am going to make a mould for smaller slots shouldn't I just enlarge them for the rails to go through? I assume on the back side of the slots would be a large backing plate or washer...
Not sure if I should add colour of not...
Do you think a heavy coat of rubber cement or contact cement would act as a release agent?
Or several coasts of varnish and maybe spray with oil...
The four circles represent 4 1/2" pvc pipe ganged together. This will give me a 2" vertical adjustment.
I am going to walk property and count posts but I think initially I will need around 180.
If I could cast 12 every 2 days it will take me 30 days to do the job.
Last edited:
Precast is the way to go. It is surprisingly cheap, and you could probably get the local home depot, or home hardware to bring them in to save on shipping.
Like these.
Woodcrete Rail - Artisan Precast
Like these.
Woodcrete Rail - Artisan Precast
Egon
Epic Contributor
2 mil plastic would make for a pretty good release agent.:thumbsup:
Note: Commercial made posts would probably be made with no slump concrete and pressed into the mold under high pressure. Then cured in a temperature moisture controlled environment.
Note: Commercial made posts would probably be made with no slump concrete and pressed into the mold under high pressure. Then cured in a temperature moisture controlled environment.
forgeblast
Elite Member
Concrete | Eliminating Surface Voids in Concrete | Smooth-On - Mold Making and Casting Materials | Silicone Rubber, Urethane Rubber, Liquid Plastic, Casting Resin, Lifecasting, Epoxy Resin, Rigid and Flexible Foam
I have used this product before, so i can say it does work.
I have also cast about 60 lawn edgers, to cast them i used spray on veg oil. We also used on more porus things 3 coats of murphys oil soap.
that precast webpage has some products really like their rail fence.
I have used this product before, so i can say it does work.
I have also cast about 60 lawn edgers, to cast them i used spray on veg oil. We also used on more porus things 3 coats of murphys oil soap.
that precast webpage has some products really like their rail fence.
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I've seen this product in the City of Livermore CA... they use it to separate the bike paths from traffic lanes along the landscaped median.