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Portland cement, major ingredient of concrete, hardens under water.  

So either the Reuters reporter screwed-up or TEPCO is lying.

(Again)


She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre

by ATinNM on Sat Apr 2nd, 2011 at 02:36:43 PM EST
[ Parent ]
well usually my money would be on the reporter, but in this case things are getting just to regular.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sat Apr 2nd, 2011 at 02:43:59 PM EST
[ Parent ]
The Oil Drum | Fukushima Open Thread - 2nd April
There are cement admixtures that will harden despite being underwater. Normal cement will become too dispersed in an all water environment and won't harden at all. They can't just go to a cement plant and bring a batch of standard cement to fill this crack; they need a low w/c ratio (water/cement) mixture with a fast hardening agent, perhaps with large aggregate sizes so the cement will have something to 'catch' on in the crack.


Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sat Apr 2nd, 2011 at 03:26:36 PM EST
[ Parent ]
Part of ordering a load of commercial use concrete is specifying what it is to be used for.  In turn the specification determines the composition of the mix.

And even if the composition is correct merely dumping a butt-load of concrete on a crack isn't sufficient.  There's all kinds of ancillary tasks and structures that have to be in place to ensure a proper pour.

I concede I should have used the word "incompetent" instead of "lying."  

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre

by ATinNM on Sat Apr 2nd, 2011 at 03:35:15 PM EST
[ Parent ]
I was thinking that with their usual perceived level of planning and performance, we will no doubt find in a couple of days that they just sent a guy to a builders merchants in Tokyo for a couple of bags of gravel and cement mix to throw into the pool.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sat Apr 2nd, 2011 at 03:46:52 PM EST
[ Parent ]
NHK -  more than 6 hours later, the amount of water flowing into the pit was so large that the injected concrete had not solidified yet, allowing radioactive water to leak into the ocean. The power company will try other measures on Sunday morning to stop water from entering the pit. It will use a particular kind of polymer which will absorb the water.

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sat Apr 2nd, 2011 at 06:16:55 PM EST
[ Parent ]
I believe the crack was reported as being 8cm wide. Some kind of hardware cloth should have been put in the bottom of the crack, if it is a bottom and not now just a gaping chasm. With all of the pumping of water to and fro between tanks, one would think they could find someplace to pump the water draining into this pit. This is pitiful.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sat Apr 2nd, 2011 at 07:38:59 PM EST
[ Parent ]
I think the 8cm was the relic of my top of the head translation of 20cm into inches, minus the inches dimension. :-) More pitiful.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Sat Apr 2nd, 2011 at 07:40:42 PM EST
[ Parent ]
we keep having things fail,  and then they say, "We'll try something else tomorrow" does noone say "Is there a good reason why you dont take the plastic out now? and if not, why are you planning on sitting on your ass for the next eight hours"?

Any idiot can face a crisis - it's day to day living that wears you out.
by ceebs (ceebs (at) eurotrib (dot) com) on Sat Apr 2nd, 2011 at 08:01:54 PM EST
[ Parent ]
So they didn't put a supporting frame - one of those "ancillary tasks" I mentioned above - around the area of the pour and the pressure of the water caused a blow-out.

Now they have radioactive water all over the place and a bunch of radioactive concrete in the way of getting to the crack where the water is pouring out and generally cluttering the area.

This is madness.

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre

by ATinNM on Sun Apr 3rd, 2011 at 01:28:08 AM EST
[ Parent ]
WHat if the water is producing 1Sv/h of radiation?

Economics is politics by other means
by Migeru (migeru at eurotrib dot com) on Sun Apr 3rd, 2011 at 05:29:24 AM EST
[ Parent ]

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