British Expats - Fresh poured 'cement' damages signalling on Victoria line

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Boomhauer

Jan 24th 2014 9:50 am

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

Sandboy

Jan 24th 2014 10:19 am

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 !

Robajob

Jan 24th 2014 3:18 pm

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..

weasel decentral

Jan 24th 2014 3:23 pm

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!)

Bahtatboy

Jan 24th 2014 9:00 pm

Re: Fresh poured 'cement' damages signalling on Victoria line

Didn't know about the sugar trick--what's the chemistry behind it?

OleJanx

Jan 24th 2014 9:07 pm

Re: Fresh poured 'cement' damages signalling on Victoria line

Quote:

Originally Posted by Bahtatboy (Post 11095916)

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.

co durham boy

Jan 24th 2014 10:33 pm

Re: Fresh poured 'cement' damages signalling on Victoria line

Quote:

Originally Posted by Bahtatboy (Post 11095916)

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 .

Bahtatboy

Jan 24th 2014 11:04 pm

Re: Fresh poured 'cement' damages signalling on Victoria line

Quote:

Originally Posted by co durham boy (Post 11095972)

It basically stops the hydration of cement particles . A lot of the old type retarder / admixtures used to be molasses based .

Sweet.

Boomhauer

Jan 25th 2014 1:08 am

Re: Fresh poured 'cement' damages signalling on Victoria line

Quote:

Originally Posted by weasel decentral (Post 11095743)

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:confused: 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?

weasel decentral

Jan 25th 2014 4:27 am

Re: Fresh poured 'cement' damages signalling on Victoria line

Quote:

Originally Posted by Boomhauer (Post 11096130)

I don't follow you:confused: 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 :angel:

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