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Los Angeles Tests Reflective 'Cool Pavement' On Streets (dailynews.com)
mikeebbbd writes: As reported in the Los Angeles Daily News, during the current heatwave various officials swooped down on streets coated with an experimental light-gray sealer that makes the old asphalt into a "cool street" -- and it works, with average temperature differences between coated streets and adjacent old asphalt around 10F. At a large parking lot, the temperature reduction was over 20F. If the material holds up and continues to meet other criteria, LA plans to use it on more pavement rehab projects, which could eventually make a difference in the heat island effect. The "CoolSeal" coating is apparently proprietary to a company named GuardTop LLC, costs $25-40K/mile, and lasts 5-7 years. At that price, it's might not be used a lot, at least at first; typical slurry seals run $15-30K/mile.
Lighter color coatings reflect more heat. Complete with expert testimonials!
“I feel a slight difference on the street and inside my apartment,” said Priscilla Corleto, 24, walking Gatsby, her small white Shih Tzu. “Without the AC, it seems cooler.
Might be cheaper to plant trees and landscaping in an urban environment. Several tech companies are using rooftop gardens to put the heat to better use.
https://www.wired.com/2015/03/facebook-moves-new-garden-roofed-fantasyland/
These surfaces should look white, and not black? More like a pond of water?
works very well, nothing experimental about it.
without our reflective outfits we start to fail around 110F.. sing along .. https://www.youtube.com/results?search_query=wmd+weather ..help end greed/fear/ego based wmd on credit & oil addiction in our lifetime.. thanks again
something like powdered limestone or any powdered mineral that will make the "black" color of asphalt less black and closer to white, its not like this company has a monopoly & patent on the colors in nature
Politics is Treachery, Religion is Brainwashing
The LAPD has been testing reflective bullets on the African American community for decades and so far none have worried.
we're currently ignoring the whole water shortage thing here in Arizona. It'll bite us in the next 20 years. The wealthier parts where I'm at are crazy with how much green there is. It's like they terraformed the landscape. You can do that when water's cheap due to subsidies but that's not going to last forever.
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The coating make some of the solar-sourced infrared heat NOT get absorbed by the roadway. Does it magically go straight back to space, or does it reflect onto other structures, heating THEM up?
I suspect mostly the latter in an urban environment. So, how does changing WHAT absorbs the heat affect the overall retention of the heat island?
Using plants absorbs more CO2, but the heat increases evaporation.
Trees and vegetation reduce the temperature by ten degrees F, cost less and last longer.
But hey, keep paving over every blade of grass and cutting down every tree in sight then wonder why it's so hot.
Why not install solar panels approximately 20 ft (6 meters) over the roads. Leave enough gaps to allow sunlight to shine through. I bet many solar developers will get on board if the city offered free rent with tax breaks. Only if there's a billionaire who has a home in the city and just happens to own a solar power company. Maybe he's too busy being bored.
Normally you sell coatings by area but if they only sell it by the mile make sure you only use it on wide streets - you'll get a far larger surface area then, maximizing the amount of heat reflected.
Using concrete without a coating of asphalt on top has a similar effect... how about just paving with concrete. It lasts longer, requires less maintenance, and is cooler. If made thick enough it can also be ground down to "resurface" it several times without any need to add more concrete unlike asphalt roads.
Using asphalt is only done because asphalt is a byproduct of the petroleum refining process and the oil companies have done everything they can to ensure they can sell their waste and force us to use it so they can avoid having to pay disposal fees for the stuff.. And while asphalt *can* be recycled, it also pollutes more than most folks care to believe. The pollution caused by the use of asphalt is right there with the pollution caused by tires... both of them break down into smaller and smaller pieces and make their way into the environment... and the stuff is everywhere, not unlike the lead that used to spew from tailpipes just a few decades ago. Manufacturers of asphalt and tires are even responsible for a far greater evil than simply polluting because we need roads and tires and don't have another option at the moment... the pollution they cause is far greater than it needs to be thanks to efforts to make the products as cheap as possible which leads to premature and excessive wear. Good quality asphalt and tires wear out far slower and therefore pollute less, but greed makes that at best a tertiary concern for profit motivated corporations.
You wrote "At that price, it is might not be used a lot". Learn when to use its vs it's. It's basic pre-school english.
We're suffering from an overabundance of energy so we have to convince some of it to go away.
This is going to make chroming the moon considerably less cool.
I am not interested in articles about life extension advancements.
Now Hippies can walk barefoot in July without burning their feet.
That someone has a patent on it can't mean that the composition is a secret. What if turns out to be toxic?
Titanium dioxide 30-45%
It's like they terraformed the landscape.
True terraforming would increase humidity and lower temperatures. It could even make the area "naturally" lush. Somehow I doubt that's what they've done though.
Arizona is absurd. I just read where they are going to plant a zillion trees in order to cool Phoenix down. In different issue of the same magazine, I read about the severe water shortages and high cost of the Central Arizona Project. I thought trees needed water.
Concrete does the same thing and has been in use for pavement for a century. It can also be sealed with even lighter sealant.
Its because you live in one of those strange cities like LA where public transit is curiously not seen as a necessity. Most major metropolitans have robust public transit systems that everyone uses.
After playing ambient music as it cruised through space after booster separation, the second stage executed a successful short burn to raise its orbit. In about five minutes it will try releasing satellites.
I assumed that it was too expensive to make a functional nonblack asphalt, or else it would have been used a long time ago. Guess I was wrong.
Concrete is grey
They started doing this in Tokyo several years ago. They painted a lot of major roads green. I was worried about them being slippery in the rain, at first, but they turned out to be no worse than bare asphalt, and I believe they helped stem the heat island effect.
j'ai découvert une démonstration vraiment admirable (de ce théorème général) que cette si
I think it's called grass.
And if you paint them white, you might get another 10 degrees. Not that anyone is going to notice a 20 degree drop when the pavement is pushing 200 deg.
Won't somebody think of the lizards?!