CHICAGO | St. Regis Chicago (Vista) | 1,191 FT | 101 FLOORS

[BVictor1]

I'm guessing they'll finish the second mini mat before there's a concrete pour?

[Bombardier]

Originally Posted by BVictor1

I'm guessing they'll finish the second mini mat before there's a concrete pour?

The mat slab pour is scheduled for this Saturday.

[Kngkyle]

Originally Posted by Bombardier

The mat slab pour is scheduled for this Saturday.

Do you know what volume we are talking about for this one? Looks like an incredibly thick mat.

[Bombardier]

Originally Posted by Kngkyle

Do you know what volume we are talking about for this one? Looks like an incredibly thick mat.

I heard around 4,000 CY

[Rocket49]

Originally Posted by Bombardier

I heard around 4,000 CY

Which is about 400 cement trucks?

Wow.

[Skyguy_7]

Originally Posted by Bombardier

The mat slab pour is scheduled for this Saturday.

Attn BVic, Solar, Harry, Schell, JMT. Calling all photogs. I just don't want anyone to miss this. We need all angles.

[KWILLSKYLINE]

Originally Posted by Skyguy_7

Attn BVic, Solar, Harry, Schell, JMT. Calling all photogs. I just don't want anyone to miss this. We need all angles.

Can we make a kickstart or donation page for all these photographer's so we can at least get them some lawn chairs, pizzas and a case of beer for the time they spend for a pour this size. It's going to be epic, thanks in advance fellas.

[Skyguy_7]

^Haha yes! Just realized I forgot to include the creme de la creme, NICK! Apologies to anyone else I neglected to mention in the call to mass. God speed, brethren

[danielschell]

Originally Posted by Skyguy_7

Attn BVic, Solar, Harry, Schell, JMT. Calling all photogs. I just don't want anyone to miss this. We need all angles.

Sadly, I can't be there. (took more pics yesterday, because....well, I had to. http://wp.me/p7uLxw-2aP )

[Rocket49]

As someone who knows very little about cement, I was wondering if cement pours ever have to be rescheduled because of super cold weather.

Obviously, tomorrows forecast weather should present no major issues.

But if we were in the middle of a polar vortex, would everything go smoothly if the temperature were 10 or 20 below zero?

[F1 Tommy]

Originally Posted by Rocket49

As someone who knows very little about cement, I was wondering if cement pours ever have to be rescheduled because of super cold weather.

Obviously, tomorrows forecast weather should present no major issues.

But if we were in the middle of a polar vortex, would everything go smoothly if the temperature were 10 or 20 below zero?

They poured 150 N Riverside when it was well below zero so yes they can do it when it is very cold. Additives have to be added to the cement.

[jc5680]

Originally Posted by Rocket49

As someone who knows very little about cement, I was wondering if cement pours ever have to be rescheduled because of super cold weather.

Obviously, tomorrows forecast weather should present no major issues.

But if we were in the middle of a polar vortex, would everything go smoothly if the temperature were 10 or 20 below zero?

Weather can affect the curing but there are additives that can be used to help counteract the temperature. (Both hot and cold) These additives help speed or slow the curing process to offset temperature influence

For a pour of of 4000cy, the concrete curing will produce a fair amount of heat. The conditions will be more problematic for the people and machines working in them.

That said, rain or snow is more problematic than temperature. A batch of ready mix concrete is usually has a specific amount of water that can be added before it is no longer viable. Heavy rains for large element pours are show stoppers.

And, sorry to be pedantic, but they pour concrete not cement. Cement is a powder, but an ingredient in concrete.

[LouisVanDerWright]

In extreme weather they tend not to pour, but I think the limiting factor is is more worker safety and comfort than the concrete not setting properly. Concrete hardening is actually a exothermic calcification reaction and therefore creates quite a bit of its own heat. I think they run into more problems in extreme heat where they actually have to douse the concrete with water for days afterwards to keep it cool enough for the reaction to continue evenly.

[SteelMonkey]

Those are some righteous pics!

Drone?

[BVictor1]

Originally Posted by SteelMonkey

Those are some righteous pics!

Drone?

He's just utilizing all the elevated roadways in the surrounding area.

[Skyguy_7]

Phenomenal update, Solar. I like the one where you caught One Bennett in the frame.

[maru2501]

some of the biggest pours since Trump i suppose

which is weird because since Trump there have been a lot of big pours at my apartment also.

[scalziand]

Do they remove the scaffolding supporting the upper layers of rebar before the pour, or does it get incorporated into the mat?

[deebirch]

I'll likely make it down armed with an iPhone 7. Not the best camera, but hopefully someone with real equipment can make it down as well

[Rocket49]

Would a pour of this size typically take 5 or 6 hours?