h a l f b a k e r yQuis custodiet the custard?
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paving with semitransparent asphalt
Asphalt causes cancer at mice, but it might be the PAH and pigmented gunk. The transparent version of asphalt viscosity petroleum distillates might be much less carcinogenic. | |
I read that an asphalt equivalent is a carcinogen. When they smear mice with tar they get cancer. So what about the 100,000s of kilometers of carcinogens coating urban areas? It might be bad for people, and you can smell it at warm parking lots.
It is possible that the same viscosity of a transparent
petroleum distillate could be measured as being much less carcinogenic. They would have to figure out the $ per cancer averted with the new paving material, and then compare it with other ways of preventing cancer.
It could start as boutique paving material for places like Beverly Hills. I know it is more than concrete, yet might be comparable $$ wise to asphalt. for the first few cities, it is possible rubber crumbles from old tires could also be noncarcinogenic asphalt fill.
search engine [mice asphalt cancer]
https://www.google....mice+asphalt+cancer
OSHA says putting asphalt on mice gives them cancer. [beanangel, Nov 19 2016]
Sort of on-topic...
http://www.telegrap...ath-is-created.html
...kinda [2 fries shy of a happy meal, Nov 21 2016]
Glass and recycled rubber in roads is WKTE
http://roadsonline....bda70c1752-59935509
[AusCan531, Nov 23 2016]
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Adding glass beads,in a high concentration, might provide some transparency. |
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Crumbed rubber, crushed glass etc are already widely used
additives in bituminous roads. They're still black although
can sparkle a bit. I don't imagine, that in any way, an
asphalt road is a health hazard other than in the usual
traffic danger sense. The PAH's might be of slight concern
to the construction crews but we've been building roads
that way for over a century. |
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There is a trend to reduce the use of 'cut-back' asphalt
solutions for sealing where the bitumen is dissolved in
kerosene which then evaporates into the atmosphere. The
preference is not switching instead towater based
emulsions. |
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//it is possible rubber crumbles from old tires could also be noncarcinogenic asphalt fill.//
I read a statistic that 75% of particulate emissions from vehicles was from brakes & tyres. |
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It's high, certainly. Railways produce a lot of dust - a lot of iron oxides from the metal-metal contact of the wheels & rails, and more from the brakes. Most brake blocks are now cast iron, or an alloy, as iron oxides are fairly benign in the environment. The historical use of asbestos in brake pads released huge amounts of dust, still a significant problem in underground networks. |
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It may depend on the particle size. Tyres and brakes release the larger sizes, which don't move far from the roadway; combustion particulates are much smaller and remain airborne. |
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And there are all those dead human skin cells, too ... |
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I think that if a mouse finds itself being covered in asphalt, cancer is probably not its most immediate concern. |
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I already told you its not my phalt. |
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Did they tell you they fixed it ? Did you *trust* them to *fix* it ? |
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Just down the clear asphalt highway from Nice. |
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But seriously, a biscuit 'cuz covering roads with clear broken glass in silicone chaulk would allow light down through to protected photovoltaic arrays beneath. |
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