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Post  Nigel Parke on Mon May 15, 2017 10:19 am

Khaimraj,

Many Thanks. I will check it out and let you know how I get on.

Regards,
Nigel
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Post  Kevin S - Wisco Bonsai on Tue May 16, 2017 6:02 pm

and there is this too, posted on the AAC blog by our man Brian Soldano (R2B2)

http://arborartscollective.blogspot.com/2017/05/concrete-pot-project-from-winter-2016.html

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Post  stoneage on Wed May 17, 2017 4:37 pm

i did some concrete pots 3 weeks ago..biggest 70x40 cm 12 cm deep
fun nice and cheap... rabbit Left for Nigel, concrete pots --------- how to. Img_0511
Left for Nigel, concrete pots --------- how to. Img_0510
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Post  Kevin S - Wisco Bonsai on Wed May 17, 2017 6:35 pm

a reminder to all:

LEACH THESE POTS BEFORE USING !!!

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Post  Khaimraj Seepersad on Thu May 18, 2017 12:56 pm

Good point Kevin,

normally leave them in a tub soaking for 6 weeks.
Also supposed to take 6 weeks for full concrete mix strength,

Have one pot in concrete in full use since 1993 or so.
Was a gift from a friend.
He used the technique shown on your site.
Laters.
Khaimraj
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Post  bilbo on Sun May 21, 2017 9:01 pm

The six weeks for curing (really it's 28 days for most mixes) can also be spent underwater leaching.
In other words, it need not be 6+6.
In fact, water curing actually increases the hardness and cure rate dramatically.
By City inspection standards, concrete which has been water cured for 28 days should test out at 97% of required strength but seldom would fail absent other contributing factors.

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Post  Kevin S - Wisco Bonsai on Mon May 22, 2017 5:55 pm

good advice mr. baggins !

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Post  Nigel Parke on Thu May 25, 2017 6:42 pm

Kevin, Khaimraj, Bilbo,

Thanks for the additional info.

@Stoneage Can you describe/show your process? I'm especially interested in how you make the moulds for the pots with curves. What materials did you use?

Thanks in advance,
Nigel
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Post  stoneage on Thu May 25, 2017 9:00 pm

hi nigel
i use just sand ..put fine little wet sand on a board ...like a table
and form it or put it in a tray and turn it upsidedown on the table
there is your mould...cover it with cement and form it..
i use a curved metal piece as forming tool..some vietnamese guys
on youtube do it much better than me...so the princip is that you do
the pot upsidedown feets up....Left for Nigel, concrete pots --------- how to. Img_0516
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Post  stoneage on Fri May 26, 2017 1:33 pm

Left for Nigel, concrete pots --------- how to. Img_0517
Left for Nigel, concrete pots --------- how to. Img_0518
Left for Nigel, concrete pots --------- how to. Img_0520
Left for Nigel, concrete pots --------- how to. Img_0519
Left for Nigel, concrete pots --------- how to. Img_0521
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Post  Kevin S - Wisco Bonsai on Fri May 26, 2017 2:44 pm

the "stoneage" method !

simple ways are best !

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Post  bilbo on Fri May 26, 2017 4:22 pm

If I may offer a couple suggestions...

It looks to me like your mix is a little dry.
I know you want it slightly dry so it will not run down your mold, but I'd try a bit more water if possible.
This may reduce the patching necessary to fill gaps.
In this usage, those gaps will never fill in completely and may retain water in hidden pockets.
You may not have a problem with that in tropical climates but if this happens where temperatures go below freezing, the pot may crack from the expansion of the water in the hidden pockets.

Then, after you reach the stopping point of your final picture:
1. use a spray bottle to lightly mist the surface to keep it wet
2. use your tool to resurface the concrete
3. As you resurface the concrete, giggle the tool ever so slightly
4. repeat other sections as necessary

With practice, you may find you'll get a smoother outer surface on finished result.


Last edited by bilbo on Fri May 26, 2017 8:30 pm; edited 1 time in total

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Post  Nigel Parke on Fri May 26, 2017 6:26 pm

Stoneage & Bilbo,

Thank you for the finer details.

@Stoneage Is your mix just sand and cement? Or have you added anything else?

I'm definitely going to try this. It looks like a fun project regardless of the outcome.

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Post  stoneage on Fri May 26, 2017 6:33 pm

just normal sand and cement..for ready mix - fine cement if you want to color it i use oxid pigment coulor
ex iron oxid- black, red oxid..... the oxid powder is mixed in dry cement 5 %
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