Making Slabs With New Materials

Hartinez

Masterpiece
Messages
4,710
Reaction score
15,589
Location
Albuquerque, NM
USDA Zone
7
Hey everyone. While I have my annual bonsai downtime with my trees mulched in, I’ve decided to try my hand at some slabs.

I recently purchased a natural slab/shell from Bonsai Kreativ out of Europe. I want to know so badly what these are made out of as it’s clearly not ceramic and clearly not concrete. Light weight, strong, but so dam natural.

I tried my hand using a sand mold and countertop concrete, but the results were less than desirable and so dam heavy.

Since I don’t know what the European based material is I thought I’d try something new other than concrete. I’ve decided to try out tile thinset as a material for slabs for its light weight finish and the fact that it has additives to create more flexibility in the freeze/thaw cycle and way lighter than concrete when dry.

I made a ridgid foam base/mold and covered that in plastic. I Applied a thin layer of died thinset over the top, then smooshed some metal screen in that layer, then covered with another layer of died thinset. I then added other dies and colors to give it a natural feel. Applying the thinset was hard even with gloves as the material is very sticky like mud and my gloves were caked with material. But it also has a consistency almost like a thick whipped cream allowing for interesting textures and opportunities to build up layers, because it holds itself up. Because of this stickiness I could also build the pieces in stages allowing each stage to dry before applying another layer

I do really like the aesthetics of them and they are much lighter than concrete and feel Very strong. Not sure how well they will hold up with trees in them but we’ll see. I’m going to pot them up this spring so I will report back.
 

Attachments

  • IMG_9951.jpeg
    IMG_9951.jpeg
    410.7 KB · Views: 93
  • IMG_9962.jpeg
    IMG_9962.jpeg
    95 KB · Views: 89
  • IMG_9961.jpeg
    IMG_9961.jpeg
    568.3 KB · Views: 81
  • IMG_9959.jpeg
    IMG_9959.jpeg
    476.8 KB · Views: 75
  • IMG_9958.jpeg
    IMG_9958.jpeg
    440 KB · Views: 68
  • IMG_9957.jpeg
    IMG_9957.jpeg
    518.6 KB · Views: 64
  • IMG_9956.jpeg
    IMG_9956.jpeg
    555 KB · Views: 64
  • IMG_9955.jpeg
    IMG_9955.jpeg
    523.9 KB · Views: 62
  • IMG_9954.jpeg
    IMG_9954.jpeg
    549.4 KB · Views: 60
  • IMG_9953.jpeg
    IMG_9953.jpeg
    566.8 KB · Views: 58
  • IMG_9952.jpeg
    IMG_9952.jpeg
    474.4 KB · Views: 62
  • IMG_9960.jpeg
    IMG_9960.jpeg
    527.9 KB · Views: 82
Better photos. With a photo of the mold next to a piece.
 

Attachments

  • IMG_6490.jpeg
    IMG_6490.jpeg
    545.3 KB · Views: 75
  • IMG_6491.jpeg
    IMG_6491.jpeg
    680.3 KB · Views: 74
  • IMG_6489.jpeg
    IMG_6489.jpeg
    477.4 KB · Views: 72
  • IMG_6488.jpeg
    IMG_6488.jpeg
    364 KB · Views: 69
  • IMG_6487.jpeg
    IMG_6487.jpeg
    438.8 KB · Views: 64
  • IMG_6486.jpeg
    IMG_6486.jpeg
    384.3 KB · Views: 57
  • IMG_6485.jpeg
    IMG_6485.jpeg
    351.4 KB · Views: 53
  • IMG_6484.jpeg
    IMG_6484.jpeg
    328.7 KB · Views: 65
Looks like your mold is convex, not concave, and you're draping the mortar over?

Do you wait for it to dry a bit before adding texture to the inner lip?
 
Looks like your mold is convex, not concave, and you're draping the mortar over?

Do you wait for it to dry a bit before adding texture to the inner lip?


Exactly. I made it convex so I could texture the bottom of the slab to my liking during the first pass and for ease of pulling the mold. Once that dries, I remove the mold then add the thinset to the inside and edges, building up material where I see fit. Adding colors and dies along the way.
 
Hey everyone. While I have my annual bonsai downtime with my trees mulched in, I’ve decided to try my hand at some slabs.

I recently purchased a natural slab/shell from Bonsai Kreativ out of Europe. I want to know so badly what these are made out of as it’s clearly not ceramic and clearly not concrete. Light weight, strong, but so dam natural.

I tried my hand using a sand mold and countertop concrete, but the results were less than desirable and so dam heavy.

Since I don’t know what the European based material is I thought I’d try something new other than concrete. I’ve decided to try out tile thinset as a material for slabs for its light weight finish and the fact that it has additives to create more flexibility in the freeze/thaw cycle and way lighter than concrete when dry.

I made a ridgid foam base/mold and covered that in plastic. I Applied a thin layer of died thinset over the top, then smooshed some metal screen in that layer, then covered with another layer of died thinset. I then added other dies and colors to give it a natural feel. Applying the thinset was hard even with gloves as the material is very sticky like mud and my gloves were caked with material. But it also has a consistency almost like a thick whipped cream allowing for interesting textures and opportunities to build up layers, because it holds itself up. Because of this stickiness I could also build the pieces in stages allowing each stage to dry before applying another layer

I do really like the aesthetics of them and they are much lighter than concrete and feel Very strong. Not sure how well they will hold up with trees in them but we’ll see. I’m going to pot them up this spring so I will report back.
Very nice!
 
Very cool. I made one out of mortar once, but I didnt use a mold, I free formed it over hardware cloth. A mold is much better.

I always had a feeling those european guys were using glass fiber reinforced concrete. Much lighter and stronger.
 
Very cool. I made one out of mortar once, but I didnt use a mold, I free formed it over hardware cloth. A mold is much better.

I always had a feeling those european guys were using glass fiber reinforced concrete. Much lighter and stronger.

Yeah I’m so curious what their process is. I understand they are trying to make a buck so I get not sharing.
 
At some point I will make another and take photos during the process. It's really hard to do this because of how messy the process is.
So true, always mixing small amounts and cleaning up between applications. I have used small grain pumice to replace the sand normally used in the mix. This saves quite a bit of weight. The drawback is having to dye the pumice prior to use to avoid a speckled look to the finished product.
 
So true, always mixing small amounts and cleaning up between applications. I have used small grain pumice to replace the sand normally used in the mix. This saves quite a bit of weight. The drawback is having to dye the pumice prior to use to avoid a speckled look to the finished product.

With this thinset mortar there is no added materials! One of the things I like. It’s got a smooth feel that you can shape and add texture to. It’s so dam sticky though. I’ve even tried putting oil on my nitrile gloves to prevent it from sticking. Doesn’t work very well.
 
With this thinset mortar there is no added materials! One of the things I like. It’s got a smooth feel that you can shape and add texture to. It’s so dam sticky though. I’ve even tried putting oil on my nitrile gloves to prevent it from sticking. Doesn’t work very well.
Sounds promising, wish we knew the epoxies being used by Kimura. The product is very strong and lightweight! looks very natural when finished.
 
I've started using fibreglass for added strength, mucked around with perlite, keen to try polystyrene balls at some stage.
I'm gonna try and stay away from steel reinforcing as rust expands.
This is the mold I used for my thermal pot pool, cone of cardboard covered in plastic.
Fibreglass/mortar mix
IMG_20230323_191621_edit_791165839261564.jpg
 
Yeah, I would love that recipe. I was surprised at how lightweight the rock was.
Vey lightweight and natural in appearance with texture similar to smooth rock, absent the fissures that roots explore. This was one that really caught my eye when visiting his display garden. It was set aside for curing just outside his smaller greenhouse that housed all the beautiful maples with outstanding nebari that were under development. I noted that they were being formed on natural rock slab, I assumed this was for needed weight to balance the completed planting. The structure itself was very lightweight with the base broader for balance, Still a very slim natural rock base. Photo taken February 2024.
IMG_2297.jpeg
 
Back
Top Bottom