Rock Sculpted from Concrete Experiment

FoldedFrog

Mame
Messages
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Location
Central Georgia
USDA Zone
7b
I’ve always liked the penjing style rock plantings. If the right rock is found, it can be a beautiful sight to behold. The problem I’ve always had is finding the right rock, the right size, the right shape. Where I live, we have mostly granite that seems to come in three sizes & shapes, big round boulders, smaller round river rocks and gravel. Lots of granite in Georgia.

I want to create something that reminds one of the tall karst in China - steep with lots of eroded cliffs. Or maybe the decaying sandstone of the American southwest. I've been studying for a while and finally decided that it might be best to try my hand at sculpting exactly what I have in mind but was a little skeptical about how the “false rock” would be perceived. Then I saw where Masahiko Kimura made some (abstract) rock formations from concrete and thought, “If it’s good enough for him….” :)

I've done some sculpting before but not to this scale. I was fortunate enough to find a very good instructional video of making realistic concrete sculptures of rock. This past weekend I had four days off work and decided to give it a try. I had made some preliminary sketches and had in mind the size that I wanted so I set to work. Holy Cow! It took pretty much all four days what with making the armature, the base, the outer sculpting then coloring but I’m pretty happy with the result.

The last pic is a Photoshop experiment with adding the trees. There are three openings for trees.

Opinions: Should this be in a clay tray, on a slab or free standing? This baby is heavy! Even though it is hollow, it still weighs about 75lbs and I'm afraid it might break a tray. Any opinions as to tree species that might look best? Cascading junipers on rock plantings seem a little ubiquitous.
 

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You did real well....Looks better than the rocks at the Atlanta Aquarium.....How big is it, hard to tell from the pics....?

Brian
 
You did real well....Looks better than the rocks at the Atlanta Aquarium.....How big is it, hard to tell from the pics....?

Brian

Thank you! Its 22" tall and 13" X 16" at the base.
 
That is pretty damn impressive! How about a link to the instructional video if possible?
 
That is pretty damn impressive! How about a link to the instructional video if possible?

Thanks. The guy's name is Mark Van Wickler and I think he works exclusively with the Houston Zoo now. You actually have to order the DVD. If you look on this page, it links to how you order. The first project in the video is a little simplistic, but the second is where he describes how to make craggy, sharp rock and it's very detailed.

http://www.makingrock.com/Iron_Orca_Studios/Making_Rock_Videos.html
 
Very nice. I mite have to order that DVD too. You did great on yours I could only hope to do that.
 
Very nice. I mite have to order that DVD too. You did great on yours I could only hope to do that.

Thank you. The greatest advantage is that, with some thought and planning, you can get the exact size and shape to match your vision. Nearly impossible when hunting for natural stone.
 
Nicely done. Impressive!

My head is spinning of the possibilities.

Thanks for sharing!
 
Thank you! Any ideas as to how much weight the average clay pottery might hold? With the rock being flat on the bottom, I thought I might be able to pour some strong epoxy in the pot and set the rock gently in place. I thought that, once the epoxy set, it would more or less become one with the tray and wouldn't crack but I just don't know.
 
Thank you! Any ideas as to how much weight the average clay pottery might hold? With the rock being flat on the bottom, I thought I might be able to pour some strong epoxy in the pot and set the rock gently in place. I thought that, once the epoxy set, it would more or less become one with the tray and wouldn't crack but I just don't know.

Depends on lots of things/variables.

Bottom line is, the weight on the top (rock and all) will be transmitted down. How close it will be to the support/legs matter, shape of the pot matter, material of the pot matter, etc. Note that what the pot can support while on a flat surface may change if you lift it up. Lack of balance can transmit most of the stress to one side which can also lead to failure.
 
Was that made with regular concrete?
Outstanding job!

Joedes
 
Really nice and natural looking, reminds me a lot of the rockbluffs where I go to look for trees! I especially like the color variations looking like lichen growth on an old cliff side.
 
Picking my jaw up off the ground...I can hardly grasp that you created this piece and it wasn't the act of nature around us. Thanks for sharing...

Thank you, Darlene! I think that if you can somehow "capture the chaos" it looks more natural.
 
Depends on lots of things/variables.

Bottom line is, the weight on the top (rock and all) will be transmitted down. How close it will be to the support/legs matter, shape of the pot matter, material of the pot matter, etc. Note that what the pot can support while on a flat surface may change if you lift it up. Lack of balance can transmit most of the stress to one side which can also lead to failure.

Right on all accounts. I think that in the end I can just try to implement the best unnoticeable reinforcement to cover the worse case scenario.
 
Was that made with regular concrete?
Outstanding job!

Joedes

The base structure underneath, and encapsulating the armature, is a mix of 1 part cement and two parts sand with a latex bonding agent added (all from HD). The outer, sculpted layer is a richer blend of 1 part portland cement and 1 part sand (with bonding agent added). The higher percentage of cement allows for more detail.

Thanks,
Stan
 
Really nice and natural looking, reminds me a lot of the rockbluffs where I go to look for trees! I especially like the color variations looking like lichen growth on an old cliff side.

COOL! That's the exact feel I was looking for!
 
Nice work!Have you thought perhaps of using a slate?
 
Nice work!Have you thought perhaps of using a slate?

Thanks, Neli. I have thought of slate and, in fact, there is a very nice mulch and stone supply place that specializes in slate just about a half a mile from my home. I have a very nice tray that I purchased this summer from the monastery near me. I would prefer to use that. But, it was very expensive and I would hate to break it from the weight of this "rock". So, if I can find a really nice piece of slate that complements this design, I think I may go with that. Thanks for the suggestion.
 
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