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Recipe for lightweight concrete? Answered

I am looking for a recipe for concrete that is light weight and fine enough to be cast into detail, i.e. no bubble or big gaps.

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rickharris

Best Answer 7 years ago

Assuming you don't need the normal strength of concrete try filling it with Vermiculite There are so many variables here it makes your question hard to answer

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hardlecrickharris

Answer 7 years ago

I am replacing pink or blue insulation foam sheets, the most common material usually used for this purpose.
I am looking to make many copies by casting, and to make something more recyclable.

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DadS1

3 months ago

I have tried liquid egg whites, you need to use a mixer and whip until it looks like a merange for a pie, really stiff. Then separately, take the cement mixture add water and mix. Now add the merange to it . The whole thing will be lite and fluffy. WARNING: do small samples to make sure you get the right consistence. This is important--- find the correct cement, water qty, merange to cement mix ratio, you must do samples to get the best cement that is lite and hard. The oldest concrete in the world had eggs mixed into it. I have been working on a Graphene cement battery for 5 years and I plan to do a video using this mixture , because the bubbles are so consistant that the graphene will disperse so evenly. the storage capacity show be greatly improved. My 5 year old cement battery still charges and holds the charge and powers an LED for days. It also can be charged from a wireless power source.

Stay Tuned for Results.

ED

cement battery.jpg
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crasch

2 years ago

I know you're probably not looking any longer, but for anyone else who may find this ible, look into EPScrete. It's made by mixing ground styrofoam with concrete. It can be made light enough to float on water. For fine detail, use the finest grade sand you can find, and add a plasticizer (Kongcrete) and fly-ash for workability. You can increase the detail by spraying a face coat with straight concrete, then filling the rest of the volume with EPSCrete. Consider adding basalt or fiberglass fibers for added strength and flexibility, and maybe laminate in fiberglass/basalt scrim for additional strength.

http://norishouse.com/archives/582

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gabdab

6 years ago

Google search for lightweight concrete diy .
They basically made a 'foam' machine (foam like in shaving foam) that gets mixed with concrete 50% I guess .

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Thaikarl

6 years ago

what you want is... PaperCrete! google it, and you'll find a lot of information. there is a papercrete yahoo group also. it's basically recycled paper, water and cement. can be very light, yet strong, and with the right technique, you can make nice molded surfaces without voids.

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Burf

7 years ago

Try white portland cement and marble dust.
Start with a two parts marble to one part cement. Add water to the mix slowly until you reach the desired consistency for your casting.

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mikeasaurusBurf

Answer 7 years ago

+1
Marble dust as the aggregate, not too sure about 'lightweight' though. There's going to be a trade-off between the fineness of the aggregate and the weight.

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Burfmikeasaurus

Answer 7 years ago

Marble dust is available in various screened sizes from almost a fine powder up to small chips but judging by his requirements for detail casts and no bubbles, I'd guess he can't use air entrainment or light weight aggregate such as vermiculite.

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hardlecBurf

Answer 7 years ago

Cement and sand or stone dust is VERY heavy. It is even heavier than coarse aggregate. Think "Floats" as a criteria.

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Burfhardlec

Answer 7 years ago

Concrete can float, steel can float. You need to be a little more precise in what it is you need and the answers can too be more precise.

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hardlecBurf

Answer 7 years ago

24 inch square tile, about 2 inches thick.
The "top" surface will be decorated with flock, trees, and railroad layout type stuff.
I want to lay tiles together with a barely noticeable seam.
The bottom must lay stable on a table top, and be "level"
I am not savvy as to making a hollow tile, but an egg crate pattern on the bottom might be possible.

PS: I know how to ignite water, and put out a match with diesel fuel. I usually don't apply anecdotal exceptions to a general rule unless it is necessary: it makes communication more complex, not more precise.

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orksecurity

7 years ago

I presume you've already considered materials other than concrete...?

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hardlecorksecurity

Answer 7 years ago

I am also looking at paper machie, which lacks strength and ability to cast.

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orksecurity

7 years ago

Lightweight _might_ be achievable by mixing in glass bubbles -- that's what's used for the lightweight spackle, if I remember correctly. But as I remember it, that's nasty stuff to work with...