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Old January 25th, 2013, 05:02 PM   #5441
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I don't typically get to watch core pours in action, but this looks messy. Is it supposed to look like that? Are they going to be able to level that out? Do they add rebar or something to this so that the next pour joins? I need answers dammit.
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Old January 25th, 2013, 05:20 PM   #5442
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Busy core pouring right now. I wonder when the core forms will jump again
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Old January 25th, 2013, 05:26 PM   #5443
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they are using the 57st crane a lot today unloading plywood from trucks on 57...for decking the third tower floor...now we see the efficiency of having cranes on both sides
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Old January 25th, 2013, 06:29 PM   #5444
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Busy core pouring right now. I wonder when the core forms will jump again
Probably early next week. The concrete will set during the weekend.
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Old January 25th, 2013, 07:22 PM   #5445
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removal of metal forms for columns and beams on 56th side ongoing..
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Old January 25th, 2013, 07:44 PM   #5446
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removal of metal forms for columns and beams on 56th side ongoing..
yup left hand corner forms are off...so is this finish color? ...looks like it is still wet...so darker than when dry
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Old January 25th, 2013, 07:45 PM   #5447
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Probably early next week. The concrete will set during the weekend.
I saw on this thread that they are using 14 000 psi concrete but approximately how much psi will it be strong once they start pouring the next floor? How long does this mixture settle?
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Old January 25th, 2013, 07:46 PM   #5448
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Yep, white concrete visible now on the 56th street. I have to say I expected it to be a little bit more whiter, but I guess it's still needed to get its full color through the next few days.
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Old January 25th, 2013, 07:50 PM   #5449
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Actually, a single pump is used to move concrete from the lobby level to the placing boom perched on the top of the super climber.

Check out the link below for a write up about the Putzmeister 14000 trailer pump that will be utilized for this project - actually 2 of them which just came off WTC-4.

http://www.putzmeisteramerica.com/ne....cfm?sr_id=232
Wow, so they will use the same as pumping the Burj Khalifa. Powerful stuff. Thanks man.
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Old January 25th, 2013, 07:51 PM   #5450
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Originally Posted by DinoVabec View Post
Yep, white concrete visible now on the 56th street. I have to say I expected it to be a little bit more whiter, but I guess it's still needed to get its full color through the next few days.
It takes about 2-3 weeks to get to the white color. The darker shades you see are from the slower curing slag in the mix. It actually gives the concrete a bluish green tint initially.
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Old January 25th, 2013, 08:13 PM   #5451
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Originally Posted by L.A.F.2. View Post
I'm 99.9% positive they took that into account. They wouldn't say, "Oh, it would take 4-5 days, but we'll let the concrete dry well and go about 20 days/floor." Just food for thought.
Of course the engineers and the construction managers on site took that into account when formulating the construction schedule.

I didn't post that for them, I posted that for people here.
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Old January 25th, 2013, 10:21 PM   #5452
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yup left hand corner forms are off...so is this finish color? ...looks like it is still wet...so darker than when dry
Here it is:
[IMG]http://i49.************/2iv00g7.jpg[/IMG]
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Old January 25th, 2013, 10:30 PM   #5453
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It takes about 2-3 weeks to get to the white color. The darker shades you see are from the slower curing slag in the mix. It actually gives the concrete a bluish green tint initially.
Maybe I missed the answer, but how do you prevent marks from the forms or lines between the layers of concrete on the surface?
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Old January 26th, 2013, 12:34 AM   #5454
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I'm still always surprised just how far those concrete pumps can reach from the streets. They always look like they'd want to tip over.
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Old January 26th, 2013, 01:49 AM   #5455
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Yeah, but the pump truck has a weighted base and adjustable arms for support.
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Old January 26th, 2013, 02:11 AM   #5456
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Quote:
Originally Posted by Kanto View Post
I saw on this thread that they are using 14 000 psi concrete but approximately how much psi will it be strong once they start pouring the next floor? How long does this mixture settle?
I know they are using 14,000 for the first 6 floors. I'm pretty sure it switches to 12,000 toward the top ~500 feet, and maybe even 10,500 or something along those lines for the top ~150-~250, I can't remember exactly what.
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Old January 26th, 2013, 03:35 AM   #5457
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Quote:
Originally Posted by Eric Offereins View Post
Maybe I missed the answer, but how do you prevent marks from the forms or lines between the layers of concrete on the surface?
That's a very good question. My guess is they use some type of sanding, grinding, or polishing to remove any marks or lines.
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Old January 26th, 2013, 03:55 AM   #5458
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That's a very good question. My guess is they use some type of sanding, grinding, or polishing to remove any marks or lines.
The main thing, is that they have to be very careful when they pour the concrete and it has to have an adequate consistency for not to leave that marks. Those prefabricated formworks also help a lot, since they offer a seamless surface to pour.

I guess that if the marks happen anyway, then they have to fix them someway, like you say by polishing or something.

But I think that only would be necessary for the first floors, who would notice such a mark, 100 meters or more above the street?
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Old January 26th, 2013, 08:51 AM   #5459
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But I think that only would be necessary for the first floors, who would notice such a mark, 100 meters or more above the street?
everyone with a zoom lens, also the people who buy the apartments provided the line of sight is right
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Old January 26th, 2013, 03:11 PM   #5460
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Suddenly, there was snow. The few workers on site are busy with snow removal. And removing more formwork.
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