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Fresh poured 'cement' damages signalling on Victoria line

Fresh poured 'cement' damages signalling on Victoria line

Old Jan 24th 2014, 9:50 pm
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Default Fresh poured 'cement' damages signalling on Victoria line

Yeah that's gona be a b#$ch to clean, probably have to install new gear.
The Telegraph calls it cement, but it's really cementious mortar, grout or concrete (assuming it has aggregate in it).

http://usvsth3m.com/post/74285062011...e-is-currently

http://www.telegraph.co.uk/news/ukne...oria-Line.html

Last edited by Boomhauer; Jan 24th 2014 at 9:55 pm.
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Old Jan 24th 2014, 10:19 pm
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Flowing concrete... But someone knew what they were doing and chucked a load of sugar in which prevents it setting

A top tip if you ever need to stop some setting in a hurry, or sabotage something belonging to someone else !
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Old Jan 25th 2014, 3:18 am
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Don't you just love it when contractors fail to grasp the concept of 'flowing'''?

Many years ago I remember a job in Grimsby when several extra drains got filled got filled along with the intended one before the contractor finally got it..
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Old Jan 25th 2014, 3:23 am
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

All concrete in the middle east flows, it's just a matter of adding enough water. (after you take some test cubes of course!)
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Old Jan 25th 2014, 9:00 am
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Didn't know about the sugar trick--what's the chemistry behind it?
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Old Jan 25th 2014, 9:07 am
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Originally Posted by Bahtatboy View Post
Didn't know about the sugar trick--what's the chemistry behind it?
No idea, but adding diesel does the same thing - it refuses to set.
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Old Jan 25th 2014, 10:33 am
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Originally Posted by Bahtatboy View Post
Didn't know about the sugar trick--what's the chemistry behind it?
It basically stops the hydration of cement particles . A lot of the old type retarder / admixtures used to be molasses based .
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Old Jan 25th 2014, 11:04 am
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Originally Posted by co durham boy View Post
It basically stops the hydration of cement particles . A lot of the old type retarder / admixtures used to be molasses based .
Sweet.
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Old Jan 25th 2014, 1:08 pm
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Originally Posted by weasel decentral View Post
All concrete in the middle east flows, it's just a matter of adding enough water. (after you take some test cubes of course!)
I don't follow you Do you mean the concrete in the mixer truck has too much water added or do you mean due to the high humidity very little water is needed?
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Old Jan 25th 2014, 4:27 pm
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Default Re: Fresh poured 'cement' damages signalling on Victoria line

Originally Posted by Boomhauer View Post
I don't follow you Do you mean the concrete in the mixer truck has too much water added or do you mean due to the high humidity very little water is needed?
I mean the concrete comes with the right water ratio, but the concrete gang then add more to make it easier to place.

Less scrupulous contractors I mean of course
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