Can decomposed granite be mixed with cement for use as structural concrete?

We have a mountainous property with no sand and very little rock other than granite. Can I use decomposed granite (as fine as sand and small pebbles) as aggregate, instead of river gravel and or sand?

Asked by MikeT107 2 years ago


Concrete? Answered

Can these molds be cast with concrete?

Asked by testerin 5 months ago


Concrete kiln? Answered

What's the best concrete to use in fabricating a kiln?

Asked by RonW45 1 year ago


want to cover cracking concrete on drive way? Answered

Is it safe to use concrete over concrete

Asked by TaylorD44 1 year ago


Concrete ? Answered

How can you finish concrete to make it look like marble

Asked by MarkD376 11 months ago


IDEAS TO UPDATE A CONCRETE FLOOR IN AN ARIZONA ROOM.

Ideas for personalizing an indoor concrete floor

Posted by cinderellato 5 years ago


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.

Asked by hardlec 7 years ago


Concrete and styrofoam object

Just had this idea and would like to hear from someone with experience with concrete. Can I make an object - a concrete shape ( box) which which has inside full of styrofoam? I am thinking about the posibility to make staircase from concrete with styrofoam inside - the role of styrofoam is to make the the box lightweight.

Posted by sasham 8 years ago



How do I level a concrete floor?

I removed a wall down the middle of my basement.  It had a concrete footing which came out with the curb when it was removed, but the concrete floor on one side of this area is one inch higher than one the other side.  How do I level this so I can install a floating laminate flooring?

Asked by Shirley Harrison 8 years ago



Has anyone tried to stain concrete with shoe polish, hair dye, or other household substances? Answered

I am casting small concrete panels for Xmas presents. I like the look of stain more than integral color, and am wondering if there are options to stain the pieces outside of commercial acid stains. The pieces will be decorative only, and not need to stand up to wear and tear like floors, countertops, or even coasters would. Would like to hear about unsuccessful attempts as well. Thanks!

Asked by Owlman76 8 years ago


"concrete smell"

Some 20 years ago, I built an addition onto my house. It is built on a concrete slab with 42 inch block foundation. I have a completely finished room in which I have installed ceramic tile flooring. Under the ceramic tile I used Ardex to level the concrete before tiling.  For the last 20 years I have never noticed what now appears to be a "wet mortar joint" smell. I have become increasing alarmed about the slab leaching moisture into the room. There is no visible sign of moisture. The tile is not exceptionally cold; it's just that smell.  Can anyone put my mind at rest, or suggest to me what this might be and how to remedy it. I definitely can not destroy the floor. Please advise. Thank you.

Posted by moea 3 years ago


Tool for vibrating concrete? (DIY?)

So I've been thinking of making some homemade concrete stuff with different molds I plan on making. Since I'm not a big expert on concrete and such I've been reading all over the Internet for how-to guides and what not. And something that seems to be a really good idea is to use a tool to vibrate out the bubbles and air pockets from the molds before they set... and so far I've not found any instructable here on how to make such a tool ( because it's a bit expensive to buy one, and hey.. why not make it myself) So my question is simply if any one know of a good idea of such a tool, how to make one or whatever.. (maybe modifying something, making one from an electric motor?) I need ideas!  

Posted by Mr_And3rsson 6 years ago


type of cement for building concrete benches?

I recently bought a bench mold so I could build a cement garden bench   The mold has some delicate designs in it.   I tried using quikrite 5000 and other cements with basic aggregates already premixed, but it did not come out crisp. The designs were pitted by aggregates I think.   I am wondering if a simple Portland cement with only sand would work? I also incorporate rebar as well?

Asked by JamesP250 2 years ago


How do I pour a concrete slab between other slabs and add an anchor to the new slab?

I have a space out the front of my house that I want to turn into a chain anchoring spot for my husband's scooter. I've included a photo of the spot for reference's sake (I really need to clean it out and excavate >. Most of the area is already concreted in but there's a space about six feet by three feet under the kitchen window that I want to fill in. I watched a few videos on how to do it and the information given was great but it showed how to pour new slabs in areas that aren't already concreted so now I turn to you guys. I also, as part of the slab, want to install a heavy duty anchoring point for the scooter that can't easily be pulled from the ground and will take a heavy duty steel chain through it. Any advice?

Asked by PaigeGrel 6 years ago


Building a fence

I am going to construct a fence between my garage and my house. 20 ft or so long, To keep my too small dogs contained. Here in lies the rub, I have already built one fence. it's still up and working fine, however in the construction I discovered how dense the crete is, ramset doesn't work, drilling? I would never get deep enough. So I have decided to use cement piers and 4x4 posts and sit the fence right on the concrete, with enough weight I am praying the fence will not move much, I only need to contain two 5# dogs its mostly ornamental. If anyone has attempted anything along these lines, please contact me with your triumphs and failures, or any advice you may have thanks!

Posted by colurblinde 9 years ago


concrete powder type? Answered

What type or specification of concrete powder you are using? is this different with concrete powder using on house or building structure?

Asked by aeroadrian 5 months ago


will concrete cure when in a sealed container? Answered

If the container is completely full of concrete, or possibly has a small air space?

Asked by theRIAA 8 years ago


how do I replace a badly broken concrete step? Do I use rebar with the new concrete ?

What kind of concrete and how would I hold the concrete in place till it sets up? This is a top step

Asked by markslanding 6 years ago


What can I do with broken concrete, concrete in small slabs?

I have a lot of concrete from an old driveway that I got rid of with a sledgehammer. I dont have a truck to dispose of the concrete somewhere. So need to do something with it around my house.

Asked by DELETED_nuwave 9 years ago


concrete mixing? Answered

I would like to know how I show pebbles inside a concrete mix.

Asked by OctaviaC1 1 year ago


Taking boot off of the concrete? Answered

Does the whole boot ever come off of the concret?

Asked by Doreene1946 8 months ago


Will concrete stick to PVC?

I'm thinking about making a concrete tube, and I was wondering if I used two different diameter pvc pipes as the mold if I could remove the concrete without damaging it too badly.

Asked by PathogenLabs 7 years ago



2 part resins incompatible with concrete???

While researching patch kits for pebble and resin coating for concrete stairs, one supplier claimed that ONLY their resin would not eat concrete.   Is it true that some resins will eat the concrete? Will fiberglass resin work for this? The pebbles are about 1/8"

Posted by Toga_Dan 4 years ago


Water to Concrete Ratio? Answered

How do you know that you are using a proper water to concrete ratio? Is it shown on the bag?

Asked by RAllenV 1 year ago


Best way to cast concrete? Answered

I need to know how many ways there are to cast concrete. I heard of silicone used in concrete casting but I would like to know if there are other ways. Thank you very much for your help.

Asked by blkhawk 6 years ago



How do I lift and repair a concrete slab in a walk? Answered

How do I lifta broken coner of a concrete slab in the walk at the front of my house?

Asked by 8 years ago



How do I anchor a handrail into old concrete?

Cement is an ingredient of concrete. I'm trying to put a small grab-rail onto my Mom's front patio, which has concrete aggregate rocks of about 0.5cm-2.5cm. It's classic, old concrete slabs. IT IS NOT PURE CEMENT. My question is: What's the best way to anchor, say, a handrail, into it. It appears to be fragile. Thanks.  

Asked by erik.gelhar 3 years ago


Transparent concrete!

OK, maybe not properly transparent, but an inclusion of fibre-optics makes it light transmitting. It's a German product, and, from their website: LUCCON translucent concrete is manufactured in large volume top layer concrete blocks with embedded webbed fiber optic cables, making the stone appear comparably massive as well as transparent. By cutting the blocks elements of variable size and thickness are obtained. Upon request LUCCON is available in special colors, dimensions or surface treatments, just ask us! . I'd love to see what our members could make with this stuff, or see them replicate the idea with their own techniques. Concrete lampshades?  Concrete windows?  Transparent concrete canoes? Video from YouTube will not embed. Luccon website via NOTCOT

Posted by Kiteman 7 years ago


WILL CONCRETE STICK TO CAST IRON OR ENAMEL as in bathtub

Hi everyone.  This is my very first Instructables experience - I've just found you guys.  I'm wanting to know if I could resurface my old cast iron enamel bath with concrete??  Would it stick???

Posted by CraftyCarolyn 3 years ago


Concrete stepping stones

I have made some concrete stepping stones (for decorative use in flower beds mainly) and have painted them to give them a detailed look. I used exterior paint,  Now I'm wondering what I should use to seal them to protect the paint from chipping and fading?

Posted by Gdlucas 3 years ago


fiber reinforced concrete $$$

Online i can see that a 60 lb bag from quickcrete is about $5. ok. easy.   Shipping----$20 to----$50----- ouch. so .   where to find it?      gotta be someplace that has 1000s of lbs of it on the shelf, and sells it at 5 or 10 bucks.

Posted by Toga_Dan 3 years ago


how do i make a column with concrete?

Molds, iron/wire gauge, how deep I must sink them in the dirt (semi-soft soil) and how it is supposed to be the foundation. Also the "specifications" for the concrete like which and how much sand and gravel to use with the cement note: they must have out side the ground 3 to 3,5 meters in height, that is about 10 to 12 feet in height

Asked by lidiarichiniti 9 years ago


I have never used concrete. After you purchase it, how do you mix the components correctly in small amounts?

I only need to mix about 8 ounces of the stuff at a time for an art project. The project requires putting concrete on cardboard sculptures that are essentially cardboard cutouts of a dog. So, the sculpture is pretty thin. What can I do to put the concrete on just the back of the cutout properly? The sculpture is about 20 inches tall and 3-5 inches wide.

Asked by coolcarl89 1 year ago


Do I need to use a metal box for an outlet?

I'm making a concrete art piece and want to insert an electrical outlet inside it.  Is it okay if I embed the outlet in the concrete or is there a reason I need to use the metal outlet box like is used in the wall?

Posted by mazelady 1 year ago


Raise Sunken Concrete?

Hello. I have a 5x5 concrete porch that has sunk 6-8 inches. The porch consists of a top surface with an 18 inch skirt, and a step. I believe it was a single pour.  The porch itself is in good condition, so I am seeking methods of raising it. I have looked into slabjacking, and pressure-fill lifting, but was actually looking for a pneumatic solution. any thoughts, comments, anecdotes, would be greatly appreciated. Thanks

Asked by sgunkler 6 years ago


How can I remove candle wax from a concrete floor?

A while back I spilled roughly one candle's-worth of melted wax on my rough concrete shop floor. It's not causing any problems, but it's ugly and feels weird when I step on it. I've thought of a wire brush and a lot of heat, neither of which are really practical. Any suggestions for removing it?

Asked by CameronSS 7 years ago


Invisible concrete cube

This concrete cube made by Daniel Franke and Markus Kison has the amazing ability to turn invisible. Thanks to eye-tracking and a video projector for each face of the cube, the cube has the view behind it projected onto its faces. The result is like looking through a glowing window instead of a cube. You can see the effect in the video. It's not entirely smooth yet, but a very cool idea. Augmented Reality Renders Concrete Block Invisible Related: Death Becomes Her Halloween Costume photo: Durchsehen, Exp. 01 (augmented perspective) by Markus Kison, on Flickr

Posted by fungus amungus 7 years ago


has anyone experimented with a homemade gunnite (concrete applied with air pressure) machine?

It cant be too different from drywall texture spray rigs.

Asked by firehazrd 9 years ago


How to clean a concrete hearth?

We're moving into a place with a non-functional fireplace and a stained hearth. I haven't touched it yet and have no idea what the stains are.  A guess for the circular ones is wine or some other dark drink.  Any ideas for a relatively non-toxic clean up? It turns out a lot of it is wax.

Asked by mole1 1 year ago


Can I sharpen a machete with concrete? Answered

Hi, so I bought a machete in Costa Rica, but it's not very sharp at all. I want to be able to cut open a coconut with it, so I need it to be relatively sharp. I found a video of a guy sharpening his blade on a regular, large, flat stone using only water. I can't find a large flat stone to sharpen it with, but I happen to have a large, flat, concrete surface, conveniently located in my basement (it's the floor). Using water, can I sharpen my machete on the concrete surface, much like the guy in the video did on the rock? He pretty much just moved it in a circular pattern, at an angle to the rock. I don't want to invest any money on this, so please let me know if this is possible.

Asked by Hadokendude 8 years ago


Cleaning up 60+ years of oil furnace chimney soot? Answered

The chimney is gone, leaving a large (about a bushel sized ) heap of oil soot on a concrete floor.    Some has been shoveled up along with the mortar dust.  There remains about a bucketful spread around a 1.5 meter square area... plus foot and paw prints over a larger area of new concrete. (I will be checking soon to make sure everyone and the dog are OK.) So what is the right way to contain this mess and get it safely out of the house?  

Asked by mole1 1 year ago


How can I lay cobblestone type paving over a pre-existing concrete slab??

We have this ugly patio slab mid yard and thought to dress it and its ajoining pathways up with cobblestone style paving such as we saw in Spain. I'd use river rock or round stones from the home DIY stores but do I lay cement and set the stones in or some sort of outdoor thinset and grout? How should I prepare the slab surface (its plain old cement/concrete and too big to smash and remove)? Please advise.

Asked by Knitwitch 9 years ago


Instructables? or advertisements??

I just noticed an "instructable" on patching cracks in concrete, posted not by an individual, but by a corporation, Sackrete, which advertises on this website. I happen to like Sackrete products, and appreciate that this company produces videos to instruct its customers, BUT... this seems to violate the spirit of this website! Is it not dubious to allow advertisers to promote their products in the same format as those videos contributed by regular folks? Anybody want to enlighten me on this?

Asked by mrchuck2000 6 years ago