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  • CosmicMiami commented on kdac's instructable Concrete Coffee Table4 hours ago
    Concrete Coffee Table

    It's not that you will be sitting on the table or putting weight on it, the concrete brings its own weight."For additional insurance against cracking, some countertop fabricators add tiny synthetic fibers to the countertop mix. These fibers, alone, will not provide structural reinforcement for concrete countertops, but they are effective at controlling shrinkage cracking. Contractors usually use them in combination with steel rebar or wire mesh."

    Understood. Just wanted to give a little advice from somebody who has worked with concrete and also done a similar build with a counter top. Looks great.

    Looks like a decent first build. I think you will find that the slab will crack when you start moving it around. The foam addition doesn't add strength and in fact weakens the slab.I don't see a lot of aggregate in your tabletop. Quikrete makes a countertop mix that is high strength. The fiber material you added will not provide continuous support over any length. Adding wire mesh (at minimum) or small diameter rebar would have been much better.I made an outdoor countertop using Z Counter Forms. It's 2" thick and has a frame underneath. It was cast in place and the durarock bottom stays. Z Forms have some excellent how to videos.Like you, I thought a wetter mix would work better. I was wrong. In fact, a drier mix is better and then use a palm sander on the forms to vibrat...see more »Looks like a decent first build. I think you will find that the slab will crack when you start moving it around. The foam addition doesn't add strength and in fact weakens the slab.I don't see a lot of aggregate in your tabletop. Quikrete makes a countertop mix that is high strength. The fiber material you added will not provide continuous support over any length. Adding wire mesh (at minimum) or small diameter rebar would have been much better.I made an outdoor countertop using Z Counter Forms. It's 2" thick and has a frame underneath. It was cast in place and the durarock bottom stays. Z Forms have some excellent how to videos.Like you, I thought a wetter mix would work better. I was wrong. In fact, a drier mix is better and then use a palm sander on the forms to vibrate everything into place. Additives may help even though it may increase the cost.In essence, you have two slabs with a foam sandwich in between. I'm not sure the minimum thickness for a table of this dimension from an engineering standpoint. I'm guessing you could have eliminated the foam, made it thinner, and used steel bar.Either way, I like the industrial look. Hope it works out for you.

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  • CosmicMiami commented on lonesoulsurfer's instructable Simple Fire Piston1 month ago
    Simple Fire Piston

    Okay pretty cool example of how pressure relates to temperature and such like combustion in a diesel engine.But as one comment says, it's so much easier to carry a butane lighter or two or three. Much less weight.I would have liked to have a narration for the video explaining what was going on instead of the music bed.As mentioned above, a great way to demonstrate the simple pressure/temperature physics relationships. I'm going to build one to show my son.

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  • CosmicMiami commented on SpecificLove's instructable 8 Life Hacks With Steel Wool4 months ago
    8 Life Hacks With Steel Wool

    http://petapixel.com/2016/05/09/steel-wool-photogr...

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