Using Non-Newtonian Fluids To Fill Potholes 260
sciencehabit writes in with a link about a group of students who have come up with an interesting idea about how to fill potholes. "Non-Newtonian fluids are the stars of high school science demonstrations. In one example, an ooey-gooey batter made from corn starch and water oozes like a liquid when moved slowly. But punch it, or run across a giant puddle of it, and it becomes stiff like a solid. Now, a group of college students has figured out a new use for the strange stuff: filler for potholes."
Re:Seems inferior to the current solution. (Score:5, Informative)
1. Mass TRANSIT is part of the transit budget.
2. There are more then one pothole. There a lot, and the queue is often very long. Plus, if work is going to be done for some other reason, they put off the pot hole repair. And some street required special permissions to close, as well as cost a lot of money in diversions.
3. Depends on your environment, and weather or not the budget allows for quality material and labor.
You need to close off portion of the street, have it located*, check for other work.
That means back ups, delays, store owners angry.
*marked to determine whats under the road at that spot.
"Non-Newtonian" =/= shear-thickening (Score:5, Informative)
I'm getting fed up of the constant references to the magical properties on "non-Newtonian" fluids. Non-Newtonian fluids have a huge range of properties in terms of their response to shear and change over time. This is constantly abused by geeks who should know better. Off the top of my head:
What people usually mean is a "shear-thickening" fluid such as corn starch and water. These become more effectively viscous in response to shear.
"Shear-thinning" fluids are *also* non-Newtonian, are fairly common, and have the exact opposite behaviour. Ketchup is a great example - shaking the bottle helps it flow more easily.
Another interesting case are Bingham plastics - these have a yield stress before they will flow. The classic example is toothpaste - it will stay as a lump on the bristles under its own weight, but spreads easily enough under pressure.
So the next time somebody wants to demonstrate non-Newtonian properties on their speaker cone, pass the ketchup!
Re:More Patents (Score:5, Informative)
Oh even better, lets abandon a closed off section of road quickly without making sure it remains safe for the traffic.
Here's a bit of info for you, to repair a pothole 90% of the time is spent setting up, packing up, and managing traffic flow. The actual job is over in a few minutes.