Posted on 06/05/2013 9:16:34 AM PDT by Renfield
The EPA has classified fly ash from coal plants as a hazardous waste.
It just pi$$es me off royally that "carbon footprint" crapolla has to be inserted into everything. It immediately makes the whole thing suspect in the sense the reader has to wonder where else in the article has environmental PC been mixed in with (and thus contaminating) real science.
News Flash: Earth and its lifeforms are carbon based.
Ironically the Italian Mafia prefers the quick setting concrete.
Exactly...pozzolan-based concrete has been around forever.
Stopped reading at “carbon footprint”
I just about stopped reading when I saw the stupid carbon footprint crap.
Me too.
Exactly. As if the Romans cared about Global Warming.
You should understand the field of construction materials is loaded with LEED certified experts trying to market "sustainable" design products. LEED certification should make you vomit.
No doubt it would do just that
The Romans knew better than to build roads in Michigan.
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GGG managers are SunkenCiv, StayAt HomeMother & Ernest_at_the_Beach | |
Thanks Renfield & wildbill. |
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Yup....they just got the copper and went back home.
That is asphalt concrete., not portland cement concrete. The cement binder is asphalt, not portland cement.
The relatively thin asphalt concrete surface layer is designed to be replaced at intervals. The whole roadway is several feet thick and is comprised of a series of load bearing and distributing materials. Although the surface in the photo has deteriorated, the underlying road way remains intact.
The traffic and the loads of present day roads can not be logically compared to the Roman roadways.
Portland cement concrete roads are inflexible. The expansion of the inflexible material is accommodated with expansion joints. Over time, the concrete edges at the expansion joints wears away. The result is bumpity bumpity bumpity bumpity bump on an old road. The condition can never be really fixed. Sawing and re pouring the joints fails, paving over with asphalt concrete eventually pushes the asphalt down into the expansion joints with the same bumpity bumpity effect.
The problem you showed is not a design problem but rather a maintenance problem. They delayed the resurfacing too long
To be fair, Rome was not run by liberals...
Would fly ash (by-product of furnaces) be a reasonable substitute for volcanic ash and chunks of volcanic tuff?
The reason I ask is that 20 years ago a professor at UWM (Univrsity of Wisconsin Milwaukee) published a paper on adding fly ash to the concrete mix used in road projects to improve its durability. He estimated that the addition of fly ash (readily available and almost free) would increase a highway’s longevity to 30 years, whereas now they repave about every 5 years and the roads are in poor repair in the meantime. I believe that his idea came from studying Roman roads.
The professor’s suggestion drew no traction and no action from Wisconsin’s road builders. We figure that it is because it threatened the job security of the labor force who likes to repave every 5 years.
See reply #36.
We were in Beijing China a while back. It snowed a few inches and suddenly thousands of people with brush brooms, shovels, bicycles with plywood platforms appeared as if out of nowhere and began clearing the snow. I asked an English speaking guy why they didn’t use snow plows and blowers. He responded “but, then, where would these people find work?”
LOLOLOL!
Flyash is mostly oxides, whereas volcanic ash is mostly a mixture of fine silicates and hydrated alumino-silicates; chemicallyand physically, they are different.
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