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World Trade Center getting built

World Trade Center getting built

RE: World Trade Center getting built

"Thirteen shear walls had been poured as of last month, with the psi reaching 17,000 on several occasions."

What does the mix design for this strength look like?  I've workde with 10 to 12, but mever this high.

Mike McCann
MMC Engineering

RE: World Trade Center getting built

msquared48, you can read of the properties of these concretes till ove 17000 psi in two leaflets (er, engineering bulletins) by pca

High-Strength Concrete
pca (Portland Cement Association) 1994

Engineering Properties of Commercially Available High-Strength Concretes (Including Three-Year Data)
pca (Portland Cement Association) 1994

RE: World Trade Center getting built

The foundation for Freedom Tower has been going on for a few years. I think they added the columns so that the tourists think something's being built.

About two weeks ago the NY Daily News reported there are still no tenant's and the project is slipping further behind schedule.

Our office looks out over the site and I can tell you it's not much different than it was 6-months ago. What a disgrace.  

RE: World Trade Center getting built

The aggregate for the concrete must be from a different location.  Typically the maximum concrete strength in this region is 12 ksi.  I've heard of 18 ksi concrete being used in Seattle.

RE: World Trade Center getting built

I thought the whole thing was being held up because of the transit station that needs to go underneath it.

Hg

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RE: World Trade Center getting built

The transit station is elsewhere in the site.

The problem is mainly competing interests, followed by lack of money and lack of tenants.

A few months ago it was reported in the media that the site might not be fully built out until ~2030.

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