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I've seen it (on TV) done with sheet acrylic. Exceptionally smooth!!
I'm wondering about the vibration issue.
If the stones (aggregate) in the concrete are more dense than the cement, won't the vibration cause them to sink to what will become the surface?
Again, on TV, it appears they've used high strength cement with a fiber (fiberglass?) mixin for strength, instead of a concrete mix.
A positive attitude may not solve every problem, but it will annoy enough people to be worth the effort.
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The vibration causes the liquid to go to the outside, because it vibrates more than the stones and sand. Because the sand reacts more to the activity of the water, it goes along, giving a layer of what we call "grout".
Me, I'd rather do it with the top upward, for three reasons:
0: You've got more control of the finish (especially if you intend to harris or champher the edges, as stated).
1: You can actually see any imperfections, and give them extra attention.
2: if any cracks form while it's drying, you can rub them out.
There are all kinds of fibres you can mix in, most of which are available at larger hardware stores, but it doesn't hurt to just throw in whatever old bits of iron you've got (long nails, ferrous cables, even wire wool works, if you pull it apart and twist it to make it stringy).
The only difficulty in using fibres is that some of them can end up on or very close to the surface, which can result in ridges and micro-cracks, which "help" the surface to degrade quicker than normal.
I wanna be a eunuchs developer! Pass me a bread knife!
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Just make sure that you've got a working rotary hammer (big SDS drill) handy for the pour. Set it on hammer & no spin, and vibrate the cr@p out of the stuff for a lot longer than you think is enough (finish off by vibrating the shutter from underneath). When you see air bubbles on the surface, burst them, and keep vibrating in the same place for a few seconds.
You want a good quarter-inch grout on the surface of something like that, so that you don't get any eventual surface crumbling (where the surface comes away like sand, and you see the pebbles underneath).
I wanna be a eunuchs developer! Pass me a bread knife!
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Concrete good for compression forces but non the opposite and tends to snap. Hence why reinforcing is used. Concrete is cheap so why not pour a rough test slab about 30" square with some reinforcing and test it to destruction!
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RossMW wrote: test it to destruction
Sounds like fun!..and not a bad idea at all considering a recent DIY misadventure with a water heater...  but I am using the rapid prototyping method for this build...plan carefully and hope for the best!  Thanks for the advice!
"Go forth into the source" - Neal Morse
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Just as an aside, check out this company:
http://www.daviscolors.com/#concrete[^]
I know it's Saturday and this post sounds to me like you might be winging it because it is ...
Good luck!
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"You look so happy, today ... I ... I've never seen you look so happy !"
"Yes," I said, "I finally found one of you that understands me."
"Delightful ! ... you know ... you should get 'Employee of the Month' for this," She said, and she went and told all the others who soon gathered round me to wonder at how I'd changed.
Finally, one of them asked: "Well ... gosh ... who is it ? Which one of us understands you ?"
"You'll find the body in the small storage room near the fire-exit," I said, wiping away the blood that was running down my chin with a florally scented wet-wipe.
I thought it best not to tell them which parts of the body I ate because it was just before lunch-time, and I knew quite a few of them were vegetarians.
«To kill an error's as good a service, sometimes better than, establishing new truth or fact.» Charles Darwin in "Prospero's Precepts"
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I have no idea what this is but I love it.
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Bootking wrote: I have no idea what this is but I love it.
I am so happy that one of you understands me 
«To kill an error's as good a service, sometimes better than, establishing new truth or fact.» Charles Darwin in "Prospero's Precepts"
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I don't know the answer either. Somehow, all of this sounds as if you are also a fan of Hannibal Lecter[^]. I feel sad for the one who understood you.
The sh*t I complain about
It's like there ain't a cloud in the sky and it's raining out - Eminem
~! Firewall !~
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Now I want to read the rest of the book. Do you have a publishing date yet?
- I would love to change the world, but they won’t give me the source code.
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He's still looking for people who understand him inspiration to write about in the final chapter.
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Luckily I don't understand you... 
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BillWoodruff wrote: I thought it best not to tell them which parts of the body I ate because it was just before lunch-time, and I knew quite a few of them were vegetarians.
Which parts of the body would you regard as food suitable for vegetarians? 
If the brain were so simple we could understand it, we would be so simple we couldn't. — Lyall Watson
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Vegetarians eat greengrocers 
I'm a veggie myself, so I would know 
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Bill, you don't know me, but when you do know me, please don't eat me. If you have to eat me, then please sprinkle me with salt and pepper, to taste, first. Easy on the butter.
Much obliged.
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Dear Bill,
While last month's Employee of the Month award may have been a little controversial, nobody really liked Janine from accounts, and so it is with great pleasure that I can confirm our Employee of the Month award, for the second month running!
Once again there was some argument against this decision but as soon as I told the board "nobody understands Bill like I do" they seemed to cheer up immeasurably, and moved to announce the award immediately!
So, congratulations!
The canteen are providing catering in my office this lunchtime, so I would be honoured if you could join me for a bite.
Sincerely
Albert Fish
PooperPig - Coming Soon
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With up-to-date dependencies and all that.
Why? Why Not?
I am currently (as of this post) configuring and building the recently released GCC 5.1.0 with all languages enabled.
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
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In what way "custom"? Please say it is to build a custom FFMPEG because I am having severe difficulties with it using my current MinGW-64 toolchain!
- I would love to change the world, but they won’t give me the source code.
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Hey, looks like you found a code buddy! 
(Exit stage left...)
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Some additional packages and stuff.
No not for FFmpeg.
What kind of errors are you getting?
I am using MSys2[^], which has MinGW builds of FFmpeg. You can also find patches and build scripts on Github[^].
You may want to look at those patches.
What do you get when you cross a joke with a rhetorical question?
The metaphorical solid rear-end expulsions have impacted the metaphorical motorized bladed rotating air movement mechanism.
Do questions with multiple question marks annoy you???
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Dear, Community
I am doing a highschool final right now with computer programming. What do you recommend I do? I have an A- right now. I know some java but is there any other language you would suggest I learn. I am thinking about doing computer programming as a job, I am currently a senior. Please respond back when you are able.
Sincerely,
A pupil of computer programming.
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Its early. Better to stay with one language and take it to a higher level than merely scratch the surface of a second language. JMHO.
Contrary to popular belief, nobody owes you anything.
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