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panlid
Senior Member
Joined: 16 Jan 2006
Posts: 3536
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 Posted: Thu Jun 21, 2007 7:25 am Post subject: Cap stone |
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need to make a cap stone to replace a damaged one. they are painted so i am not worried about colour etc.
i have never done this before so would appreciate any advice.
i was going to make a mould with ply and fill it with concrete. do i need to line the ply with anything to help getting it out. do i need to add anything to the conc?
any ideas welcome.
thanks.
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tim'll fix it
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Joined: 18 Jan 2006
Posts: 2137
Location: Leicestershire
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| Posted: Thu Jun 21, 2007 7:42 am Post subject: |
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I made some for some pillars in my garden, as I couldnt find anything the right size once I had rushed ahead and built the pillars 
I used some hardboard at the time and screwed 2x2 round the edges with planned sides to get a chamfer on the edges. Screwed them together and then poured a sharp sand and cement mix in and tamped flat. It worked a treat.
I wanted a coloured mix so added cememtone to the mix.
I would screw the mould together so you can, unscrew it once its set, rather than prising it apart
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panlid
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Joined: 16 Jan 2006
Posts: 3536
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| Posted: Thu Jun 21, 2007 7:49 am Post subject: |
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hi tim.
good idea to screw. i was going to add something like 8mm stone. sounds like it could be a bad idea though in terms of getting a smooth finish.
did yours end up smooth?
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sparkydude
Approved Electrician
Joined: 13 Aug 2005
Posts: 942
Location: Staffordshire
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| Posted: Thu Jun 21, 2007 2:30 pm Post subject: |
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The best idea, is to use a mould as said before, then put i mix of sharp sand and cement in for the first layer, the one you will see when the mould is released, then add your mix with the stones in to the rest of the mould, I would also add some chicken wire to mixture to add some reinforcement. You can coat the inside of the mould with vegetable oil to act as a realease agent.
Nick
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tim'll fix it
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Joined: 18 Jan 2006
Posts: 2137
Location: Leicestershire
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| Posted: Thu Jun 21, 2007 2:51 pm Post subject: |
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not perfectly smooth but no holes in the faces,
then I didnt want perfectly smooth
I am amazed how well they have lasted been in 6 years this summer and no cracking or anything
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handyman
Senior Member
Joined: 16 Jan 2006
Posts: 2863
Location: Alderley Edge, Cheshire
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| Posted: Thu Jun 21, 2007 3:20 pm Post subject: |
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tim, have you never heard of a jet washer 
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skiking
Senior Member
Joined: 13 Sep 2006
Posts: 3086
Location: Cheshire
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| Posted: Thu Jun 21, 2007 3:42 pm Post subject: |
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Its the rustic look 
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panlid
Senior Member
Joined: 16 Jan 2006
Posts: 3536
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| Posted: Thu Jun 21, 2007 4:55 pm Post subject: |
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will try the vegatable oil and sharp sand mix.
would you recomend a 3-1 mix?
tim they look good and i like the moss. dont you dare clean em!
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jason123
Senior Member
Joined: 16 Dec 2006
Posts: 1239
Location: Stellaville
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| Posted: Thu Jun 21, 2007 8:27 pm Post subject: |
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Its cement and sharp sand in the ratio, not vegetable oil 
We had to build a step some time ago, I knew the importance of a vibrating poker, made one with a bit of 15mm copper pipe and stop end, inside Id welded a nut onto a bit of round bar, worked a treat. If the mortar mix is vibrated you can add aggregates no problem.
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tim'll fix it
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Joined: 18 Jan 2006
Posts: 2137
Location: Leicestershire
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| Posted: Fri Jun 22, 2007 9:08 am Post subject: |
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yes I like then moss too :grin:
I dont live in surburbia so I dont feel the need to jet wash everything within an inch of its life
I wouldnt go for such a strong mix (more cement is not better I was always told) 4 : 1 sharp sand to cement and I would put some frost proofer or plasticiser in the mix
jasons vibrating idea is a good one
I spent a lot of time stir the mix in the molds and bashing them with a hammer, but then my molds werent very deep. You could use an sds on hammer only as a vibrating poker
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panlid
Senior Member
Joined: 16 Jan 2006
Posts: 3536
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| Posted: Fri Jun 22, 2007 12:30 pm Post subject: |
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good tips.
will get my drumsticks out and give em a bash :grin:
anyway i live in surburbia and dont even own a jetwash 
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handyman
Senior Member
Joined: 16 Jan 2006
Posts: 2863
Location: Alderley Edge, Cheshire
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| Posted: Fri Jun 22, 2007 1:58 pm Post subject: |
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jesus..........we have strong jetwash opinions now
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panlid
Senior Member
Joined: 16 Jan 2006
Posts: 3536
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| Posted: Fri Jun 22, 2007 5:02 pm Post subject: |
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i dont and never will own one!!!!!!!!1
i use my father in laws
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marksson
Senior Member
Joined: 12 Feb 2007
Posts: 436
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| Posted: Sat Jun 23, 2007 10:17 pm Post subject: |
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The mix should be a stiff as possible
Use the largest aggregate practicable
Use the optimum ratio of fines to coarse aggregate.
A low water to cement ratio is the number one issue that affects concrete quality. Do not add too much water.
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My 8ish year old jet wash has seen the light of day maybe twice.
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