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I want to build desk objets out of concrete, such as the ones in the images below ( i don't own any of them, they have been taken from around the internet).

http://www.designboom.com/design/concrete-rollerball-pen-by-22-design-studio-at-designboom-shop/

enter image description here

and

http://fancycrave.com/concrete-desk-accessories/

enter image description here

The walls of these objects are not more than 4mm thick, what kind of mix would i need to make such objects so that they are durable ?

I have tried the normal sand, cement mixes but they don't seem to good enough at the thickness I am using. I have heard about GFRC and admixtures but i don't get to buy them where i live. So i am trying for a DIY solution from scratch.

Has anyone tried to build such objects ? If so what do you recommend. I am new to using concrete, so please help me out...

Thanks in advance...

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The 'Hobby project' police will be coming for you.. try to incorporate a home improvement angle, such as concrete repair. Allowable topics: diy.stackexchange.com/help/on-topic –  HerrBag Aug 31 '13 at 12:44
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closed as off-topic by Niall C., Tester101 Sep 4 '13 at 16:45

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Arts, crafts and decorating advice are off-topic as they have little in common with the other home improvement tasks discussed here." – Niall C., Tester101
If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer

Two elements will help in casting small concrete parts.. A plasticizer, such as a latex admix and vibration of your mold, to cause bubbles to rise.

If you really can't get a latex admix, you might try latex paint, as a guess (keep the percentage low, <10% of your water)

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Thanks for the suggestion, i will try mixing in some latex paint and see what the results are like. What does the plasticizer do in this mix? –  cpv Sep 1 '13 at 2:48
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Plasticiser improves the workability of the concrete, without adding excess water (which will reduce the ultimate strength of the conrete). See en.wikipedia.org/wiki/Plasticizer#For_concrete –  John Sep 2 '13 at 7:38
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