Instructables
Picture of concrete lamp
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this is a lamp in concrete, glass, and steel.

this is a project for futurecraft (blog here)
 
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Step 1: Stuff you'll need

You will need:

concrete (rockite works best). something to mix it in/with
something to make formwork. Plywood or melamine work well. Foam Core can also be used.
16" of 1 1/2" X 1/4" steel bar stock
3 pieces of glass: 1/4" thick: 12" X 4"; 1/8" thick: 12" X 3 1/2"; 1/16" thick: 12" X 3 1/2"
(you can cut these yourself, or easier yet have a glass store cut them. they need to be fairly precise.)
screws, drill, drill bits, driver
foamcore.
glue gun
ceramic lamp socket
4" threaded lamp post
light bulb (bright)
lamp cord
lamp switch
screw driver
space to make a mess
free time.


Step 2: Making the outer formwork

Picture of making the outer formwork
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first, you need to make the formwork. this will make or break (literally) this project. the more precise you can make it, the better.

The inside volume needs to be exactly 4" square. You can use melamine, which will give a smooth surface. You can also use lumber or plywood, with can give the concrete texture.

If you use 3/4" material, you'll need 2 pieces 4" X 14", and 2 at 5 1/2" X 14". And 1 bottom (which is actually the top) at 5 1/2" square.

Again, make this as precise as possible. If you don't have access to a shop, you can use 1/2" foamcore, and a knife and ruler. Use a glue gun to glue it all together. If you coat the inside surface of the foamcore with clear packing tape, the concrete won't stick, and you'll get a smooth, glassy surface on the concrete. The foamcore method is probably easier and less forgiving, and works pretty much in the same way. Just make sure to seal the joints really well, with the glue gun or packing tape. Otherwise, it will leak. everywhere. The concrete will be very liquidy. Like heavy cream. Don't underestimate it's ability to find cracks and leak out of them.
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picbuck6 years ago
Looks great and very clever! Just to prove I have no life, I'll throw in the following: It's cement when it's in the bag, and also when it's in a liquid (or semi-liquid) state. It's only concrete after it's hardened. "Hardened" because cement does not "dry" by evaporating water. It hardens--into concrete--by a chemical reaction. OK, sorry to be such a stickler, back to the lamp. Lamp's cool!
Umm...not to be a jerk, but, that's not what I have been told. I was told that it's cement when it's dry, concrete when it's mixed with the other ingredients that make it concrete, and... My stepfather was a General Contractor, and I have other family that is in construction also... they've always said that you have to wait for concrete to "dry" and that is why it isn't good to lay concrete in wet or cold conditions. Hmm...
It is true that the concrete "cures" and doesn't just dry out. Also are you sure you heard them correctly? In northern Australia (where I am from), it is often too hot for the concrete to set evenly (causing cracks etc.). To combat this, most "pours" are done late in the afternoon when it is cooler, and then once the concrete has begun to set, its given a good spray with the garden hose. I honestly think (though i'm no expert) that being wet and cold are ideal conditions for curing concrete.
Oh and i'm not sure but I remember seeing a documentary on the construction of a huge dam somewhere (maybe in the U.S. or China? pfft) where they actually had to chill the concrete to prevent it from curing too rapidly. 
And I think they actually added ice to the mix when building the Burj Dubai. But that was to stop the mix from seizing under the pressure when being pumped up so high...
well, if the concrete dried to quickly, wouldn't it crack? like mud?
It can but is more likey to spall.
Thats when concrete freezes, or cures too hot, and after curing the top smooth surfaces slake off in chunks, exposing the rough rocky interior, making surface look like broken concrete.
Canoeman
interesting.... might be a design element to take use of. that is if the concrete wouldnt just fall apart or something.
Its the hooover dam.
If it's really cold it can be important to keep the pour warm while it cures, because clearly there would be trouble if the water in the mix was to freeze.

Large pours have to be watered, often for several days after being laid, because the curing reaction is exothermic. Setting concrete actually produces some heat, so a large amount of concrete setting can cause enough heat to be problematic.

I've never bothered with the semantics of concrete vs cement, and I figure nobody will be confused by using set, cure, and dry interchangeably.
I am a division of the state architects structural inspector, and was a general/electrical contractor for 30 years. Cement is a dry powdery ingredient, in concrete When it is mixed with sand, and aggregate (rock) it becomes concrete mix. When you add water, it becomes concrete Cement is made by heating limestone (calcium carbonate) with small quantities of other materials (such as clay) to 1450 °C in a kiln, in a process known as calcination, whereby a molecule of carbon dioxide is liberated from the calcium carbonate to form calcium oxide, or quicklime, which is then blended with the other materials that have been included in the mix. The resulting hard substance, called 'clinker', is then ground with a small amount of gypsum into a powder to make 'Ordinary Portland Cement', the most commonly used type of cement (often referred to as OPC). Portland cement is a basic ingredient of concrete, mortar and most non-speciality grout. The most common use for Portland cement is in the production of concrete. Concrete is a composite material consisting of aggregate (gravel and sand), cement, and water. As a construction material, concrete can be cast in almost any shape desired, and once hardened, can become a structural (load bearing) element. Portland cement may be grey or white. After pouring concrete, it is important to keep the concrete hydrated and above freezing temps. Hot weather will cause the outside of the concrete to begin curing faster then the inside, causing shrinkage cracks, As concrete cures, it produces heat as a chemical reaction. When looking for a smooth outer surface, use a vibrator to remove bubbles and consolidate the concrete. Keep it cool, and if possible cover it with plastic after the surface has cured long enough, so it will not leave plastic fold marks on the concrete. If you are making a lot of concrete objects, a fairly inexpensive cordless drill mounted vibrator that has a phallic shape can be dipped into the concrete to consolidate and remove exterior bubbles or what is referred to as rock pockets. Once you remove the forms, keep it covered for as long as you can to prevent cracking. Vibrators can be rented cheaply at tool supply centers Humidity is concretes friend, when curing. To add a nice touch, quartz, turquoise, minerals and fossils can be imbedded into the mold when pouring, then polished with a hand grinder when finished. The colors really stand out, after grinding, and coating it with a clear concrete sealer, to give that wet river rock look. Hope this info helped. Canoeman
I live in England and when I worked for a leisure company installing patios and conservatories I regularly used to have to lay concrete in the wet or cold conditions; It does set, but it just takes longer, it sets through a reaction withthe lime in its mix.

and to help with the Concrete/ cememnt argument , the English Oxford dcitionary defines the following:

" Cement/ noun/ : a powdery substance made by calcining lime and clay, mixed with water to form mortar or mixed with sand, gravel, and water to make concrete. "
but the weird thing is concrete will set under water and is alot stronger because it cures more evenly
I'm not sure if you said this or not (I couldn't understand what you said exactly), but cement is an ingredient for concrete. Concrete is made up of sand, rocks, cement, etc.
TnT1016 years ago
Waaaay cool. I'd like to know what the weight difference is between that RockStuff and standard cement. Guess I'll find out soon enuff. Great work!!
Canoeman TnT1013 years ago
This could also be done with concrete backer board, and then troweled with grout, to eliminate mixing concrete. Then sanding grinding the outside smooth, to expose the glass.
I have built a few pony walls like that.

(pony wall = A short partition wall about 3 to 4 feet high.)

Canoeman
Sandisk1duo6 years ago
how much does it weigh?
I wonder if you could add the same materials to the concrete/cement mix that is used in making the lightweight "concrete" planters and such? Or, would make it not as heat/fire-proof, I wonder? Although, if the light source was a lower wattage, would that matter?
broken glass added to the mix maybe. if you left glass in a cement mixer with just the sand and let it run for a while it would take the sharp edges of the glass and give sand blasted effect to the glass. i dont know if adding water would help.
This is kind of a new technique used on concrete floors and some wall covering
where nails, screws, glass, and bits of well anything really is added, then ground flat to remove sharp bits using Carborundum Stones. mosaic of bits of crap
http://www.youtube.com/watch?v=ogVYwPcsnqY
I once made some concrete sheres with chunks and strips of aluminum and pewter in the mix. and ground the surface, exposing the aluminum, then polishing the outside, then polishing it again with bees wax, they were beautiful.

Canoeman
Maybe to prevent alot of the light from being absorbed by the grey concrete you could paint the inside white. This would reflect alot of the light and allow more to come out the top, bottum and sides.
Conrete dye is available from any builders supply, in just about any color you can imagine.
It can either be mixed in, or rubbed on soft curing concrete.
It comes in a powder form.
techtable4 years ago
 an interesting idea would be to embed fiber optic cables in the concrete, to make it slightly translucent.
Fiber optic transmission of light through concrete is a good idea that has already been done.

Without the expense of communications grade fiber optics, acrylic rods and fishing line have been used to transport light through concrete in years past.
Ok so I did all the steps but I'm still having trouble getting the light to shine though the concrete.... any suggestions? Btw if it dont let light though it makes a great hat.
lol. 15 lbs hat.....
One of the best lamps on here. Period.
Great work! I'm in the decorative concrete field; counter tops, floor overlays, furniture, vertical stamped and hand carved concrete, and on occasion a dinosaur statue :) This is a design I haven't seen. I will definitely be making one of these. Thanks Concrete Phil
concrete phil i know a concrete pete u 2 should meet up
andybuda5 years ago
I'm thinking of using two pieces of glass and putting a mould on the front to take speaker drivers so the front has the two edges as glass with speakers down the center that would be cool .... the sides could all so have a design in them "its a shame to have all the sides in glass under concrete and not use it" if i get round to doing this ill let u know should work though...let me know what u think... did you use any mould oil on the wood/foam.... or do you think if i used plastic over the inside of the moulds that would work cause i like the very smooth finish it produces...
am I seeing correctly that your wall is also covered in / made of concrete?
otoupalik5 years ago
Very beautiful!
Very stylish, very modern and sophisticated. I love it.
pepsiqueen5 years ago
this project reminded me of something i would have done for a class back in architecture school. then i saw the image with the graphic standards in the background and couldn't help but laugh! Thanks for the post.
gosub5 years ago
Maybe not for everyone to build but yes: Slick.
Aerospaced6 years ago
That is freakn' slick! One thing I learned by casting metal, porcelain, wax and plaster: use a release agent. I find petroleum jelly works best. It's messy, but it will fill any little voids that the material will get into and cause your mold to stick. I think I'll try this one with a twist. I want to put colored glass on top of the large panes in a pattern. Sort of like a stained glass effect. Or maybe a T.A.R.D.I.S. !
hands_on (author)  Aerospaced6 years ago
To answer a few questions: It's 16" tall, 4" square. Probably weighs about 15 pounds. Walls of the shade are 1/2" thick. Yes, your formwork needs to be able to release. I used packing tape which works well on flat surfaces and leaves a smooth finish. Petroleum jelly works well but can leave marks. The glass is smooth enough so no concrete will stick to it. The design is intentionally restrained. There's a lot you could do with this technique. Please, modify and experiment. I'd be curious to see how it goes. Thanks for all the nice comments.
This is a GREAT design! I love the "Industrial" qualities, but also that it looks Modern, Sleek, and totally Fresh! I really, really do love it! I might try this, but, I might think about adding that material(s) that they add when making Planters, in order to make it more lightweight and less costly. I don't know. I've been thinking, though, of adding lamps, one of a kind and others, to my list of "products" to sell once I get my website up and running. Even if I altered this design a little, I think I'd feel that I would have to credit it's original design to YOU. How could I go about doing that? Would you have a problem with that?
charonme6 years ago
Stick tinfoil on the outside of the glass (between the glass and concrete) so that a bit less light is absorbed by the inside concrete walls. This might make the overall light output a tiny bit brighter and reduce heat buildup a little.
Or, what about using Copper-Foil Tape, as is used in Stained Glass Constructions? Just a thought. It might be a little less work and a little neater. If anybody else already suggested this, sorry, I haven't read the whole thread yet, and I am new here.
Abhorsen5 years ago
That's pure genius. I love it 5.0! I'm soooo gonna do this!
Thats awesome. This would cost ALOT in a store. Remember: BE PEACEFUL BE ZEN BE SIMPLE Great job!
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