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Cement plaster molds3/2/2024 ![]() Important to know: How much concrete do i need? DIY 2: Concrete casting mould made of styrofoam / styrodu The support from the outside ensures that the cardboard walls withstand the pressure of the concrete mass. The protection from the inside ensures that the cardboard form does not soak. Depending on the size of the object to be cast and the amount of concrete required, you should also support the walls of the cardboard mould from the outside. Here, however, it is important to ensure that the cardboard is given a protective layer by means of foil, adhesive tape or other sealing materials. ![]() Of course, you can also make it easier and more individual by pouring the building material of cement, sand and water into cardboard moulds. DIY 1: Moulds for Concrete made of cardboard / Karto There are many different silicone moulds for pouring dough, water, chocolate and other great kitchen utensils – just use them to make concrete figures, concrete moulds, paperweights, etc. The advantage of silicone casting moulds for concrete is that the building material can be flexibly removed from the moulds without these possibly breaking. For example, ice cube or praline moulds as well as cupcake and other silicone baking moulds are ideal for pouring concrete. Silicone moulds have also become indispensable in the household and for the production of concrete decorations. Surely you will find more hollow bodies for such a procedure. So you have the possibility to produce a “concrete bottle” by pouring the building material into a glass bottle and carefully knocking it off after hardening. With other shapes and objects you can be similarly creative. This gives you a solid, hollow hemisphere after the concrete has hardened. ![]() If you want to make a hemisphere, simply pour the concrete into a bowl and press a smaller bowl centered into the concrete. ![]() You can use a standard bowl for soups, muesli, etc. Have fun doing handicrafts! Mold: Concrete in mold casting How to make Concrete Molds? Here you will get answers and learn how to make or improvise a mould for pouring concrete yourself. In this guide we have summarised a few possibilities, tips and tricks that will help you to make your own concrete casting mould. A librarian might help you uncover a hidden gem in the attics.In addition, you can also use everyday objects and perhaps not at first glance intended objects to make casting moulds for concrete. You guessed it, it's in french, but I can imagine that this subject is equally covered in other languages. The books title is "Nouveau manuel complet du mouleur en plâtre, au ciment, à l'argile, à la cire" par Lebrun and Magnier. It's just that old craftsmanship sometimes get lost. Making outdoor plaster sculptures isn't a new thing. There is a reprint of a 1887 book that covers all sorts of recipes to make plaster more resistant to weather and other conditions. Andrew also runs a mailing list of concrete artists where you could drop your specific questions.īut you may not need to give up plaster. A terrific lecture about what works and what doesn't for smaller items. My first trials were a complete failure, and I then bought the book Concrete Handbook for Artists by Andrew Goss. I once looked into concrete, and more specifically making small sculptures from concrete. Trinic has done a lot of instructionals (with almost guarantied poor sound) making GFRC, which is the next logical step up from casting. Forton is another product range that comes up. To get exactly what you want, you do have to learn some recipes/mix designs.īuddy Rhodes makes a lot of products as well as ready made concrete. You can buy ready made products, where you just add water where all, or most of this is already included. It's all amazing stuff and you can spend a long time learning about it. That is the additive called a "water reducer" and it usually comes along with a "super plasticizer". Like fucking magic, you can mix in a powder that turns a dry mix into a runny mess. A good mix is too dry to pour! So this is where additives comes in. Concrete also gets stronger the less water you use (to a point), so you want to use as little as possible. Make the aggregate smaller (so fine sand/marble/other stuff), and you have finer concrete. So there is a limit to how detailed you can go.Ĭoncrete is water + cement + aggregate. Grain size is an issue and if you have small details that sticks out, concrete is actually pretty brittle/weak. Not as weather resistant as concrete, but better than plaster in all ways, kinda, and takes details very well.Ĭoncrete is unforgiving in that it is very hard to work after it has cured, and if you are using with split molds, it always leaves a trace. Concrete is however unforgiving in many regards, so I find that a product like Jesmonite (Aquaresin or Neomatrix for the US) is a good compromise. They won't stay pristine for as long as concrete is more abrasive, but that is not much of an issue.
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