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Bendable, Self-Healing Concrete is Hundreds of Times Stronger

Any engineer would look at this image and buy levitra online usa say, "That can't be concrete!" But it is; and it could represent a way to make bridges and other structures safer and longer lasting.

There is buy fioricet a lot of work being done to improve concrete, right now. And while it is not the most beloved green building material, it has properties that make it eminently useful for engineers and architects for a number of purposes. Given that there is not going to be a sudden moratorium on using the cheap propecia canada stuff, it's better to brand cialis have improvements that can keep from having it go from useful building material to landfill.

Professor Victor Li at the University of Michigan has developed a self-healing concrete that can help alleviate the need for demolition and replacement of concrete after it has been subjected to heavy stress. By devising a concrete that controls the way it cracks under stress, the concrete can withstand tensile strain hundreds of times more than ordinary concrete. Beyond its remarkable flexibility, this concrete can then heal itself, as well.

"In Li's lab, self-healed specimens recovered most if not all of their original strength after researchers subjected them to a 3 percent tensile strain. That means they stretched the specimens to 3 percent beyond their initial size. It's the equivalent of stretching a 100-foot piece an extra three feet—enough strain to severely deform metal or catastrophically fracture traditional concrete."
The new concrete needs only exposure to moisture and carbon dioxide in order to heal the microscopic cracks that are formed after the concrete has been stressed. The cracks expose dry cement in the buy mg propecia structure, and this reacts with CO2 and moisture to form calcium carbonate 'scars' which quickly heal the concrete.

"The professor says this new substance could make infrastructure safer and more durable. By reversing the typical deterioration process, the concrete could reduce the cost and environmental impacts of making new structures. And repairs would last longer."

Link: Michigan Today (thanks KGS!)

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Comments (7)Add Comment
written by Fred, June 24, 2009
So far sounds good... Any cons?
written by Corban, June 24, 2009
Undoubtedly, it's more expensive. Whether the cost premium surpasses the reduction in maintenance costs, we don't know. I'm interested in the healing mechanism, though. Where is the reaction energy coming from? Does it have to be exposed to sunlight in order to scar?
written by John, June 24, 2009
Looks very promising....I think one benefit to help with extra cost is that if it is stronger you would not have to use as much
Just wrote about this topic this morning
written by Alternative Green Technologies, June 24, 2009
I just wrote about this topic this morning on our Green Technology Blog.

The advances in concrete just keep coming. I really like this one since it seems like something that in time all concrete will have.

If it works like it's supposed to, I'm sure the added costs will be paid for in longevity and recommended site cialis dose lack of maintenance.
How does healing affect reuse/recycling?
written by Jason, June 24, 2009
If the concrete is manufactured to "heal" itself, what happens when you want to grind it up for reuse/recycling? If you ground it up and dumped the cialis cialis chunks into a big pile on the side of the road, would the big pile "heal" into 1 large clump ?... (in other words: how do you stop the "healing" process if you want to break the concrete down and replace it with something else?)
Terminator Syndrome
written by Alli, June 25, 2009
hahaha. Jason. Its not caprisun. It's concrete. all the chunks would just regain their initial strength, but they still remian chunks.
written by CPArch, June 26, 2009
The self-healing aspect seems very promising but I am concerned that the how to get levitra in canada extra tensile strength would detract from the compressive strength. Concrete has always been very strong in compression and very weak in tension which is why steel reinforcing bars are used. Lots of things bend before they break but I wouldn't build bridges out of any of them...

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