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Building small objects out of concrete

Hi all,

I was wondering if i could get any pointers on mixing concrete, I have gone through the concrete mixing instructables already and have not found anything suitable and hence I am asking her. I want to formulate an open recipe to make concrete objects like the ones in the following links,

http://fancycrave.com/concrete-desk-accessories/
http://www.ledindon.com/en/objets-design/9029-stylo-plume-beton-arme.php
http://www.designboom.com/design/concrete-rollerball-pen-by-22-design-studio-at-designboom-shop/

They are mostly small objects where the wall thicknesses are quite small (maybe a few mm). I think it will be interesting to see a DIY approach to making a concrete composition that is strong in small thicknesses, i think a lot of cool objects can be made from it .

I have tried the normal concrete mix with cement and sand but i am not able to get it strong enough at those small thicknesses. Can anyone please some suggestions or advice on how to go about this ? 

Thanks in advance, please see attached files for some images taken from around the web, i do not own any of them.

Picture of Building small objects out of concrete
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CaseyG395 months ago

This is what I use! ShapeCrete, plays like clay works like concrete.

1c896e440ef54879fa4eb3e74502d31a.jpg

I'll have to have a look at that stuff, looks interesting!

varun2021 (author) 3 years ago
I am also looking to add powdered glass, and steel wool bits to the concrete mixture, would that be of any help ?
Oh, that sounds promising. You'd have to seal the concrete to stop the iron rusting, but with enough glass in the fill, the concrete could become translucent...
varun2021 (author)  Kiteman3 years ago
That sounds interesting, ill post an instructable with my findings, i am going to try out : glass powder, glass wool, steel wool, silica and nylon powder/fibers.
MarkW11 varun20215 months ago

Hi, wondering if you came up with a solution since I'm exploring this at the moment.

Cool.

Remember to take plenty of photos, and record how much of each substance you add.
varun2021 (author)  Kiteman3 years ago
Sure will do...
mikeasaurus3 years ago
There's a few GFRC (fiber-reinforced concrete ) that might be what you need, here's a project that was recently done with GFRC: https://www.instructables.com/id/Fabric-Formed-Tea-Table-in-GFRC/#step6
varun2021 (author)  mikeasaurus3 years ago
Thanks for the link, but unfortunately I asked around and GFRC is not available to purchase where I live
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