this post was submitted on 23 Mar 2024
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The asphalt company is basically all of Los Angeles' roads. They came up with a way to use recycled asphalt grindings in a MUCH higher percentage of the mix in a process that involved soaking it with diesel fuel for a specific amount of time and mixing it. The loader operator feeding the plant had just enough down time to do the soak and mixing process. This recycled grindings mix was added to the hot aggregate strait out of the drum burner right at the liquid asphalt mixing point. If I recall correctly (after two decades), the allowed limit for recycle was 15% according to the state, but they were able to run between 30%-45% recycle with their methods and it was undetectable in the company engineering test lab. You be the judge of how that falls into corruption versus innovation.
Interesting, thanks for the context. I don't know anything about asphalt, but if it didn't cause any health or safety issues I'd place it on the innovation end of the spectrum. I'd be interested in things like how the spent diesel fuel was disposed of and if any petro chems would leach into stormwater from asphalt made this way.
Diesel fuel is the primary solvent of the liquid "AC" they called it aka the black stuff. For instance, you get any hot AC on you, you're in big trouble because it is super hot, but on your clothing or a spill, the only way to get it cleaned up is with diesel fuel. There are stages of containment around the storage of the stuff. As far as recycle, it is just enough diesel to wet the old AC in the grindings. There is no excess. It has to be wet for the new and old to mix. The operator is wetting the surface well then feeding the aggregate bins for the plant. Each time they feed a bin, they scoop and drop the recycle grindings. Every 4-5 times, they add a scoop to the conveyer bin, put a fresh scoop on the back of the stall, and soak the mix in diesel. The diesel doesn't penetrate very deep and the point is to keep it consistent. That area is in the second containment zone for AC, so it is not a part of the groundwater environment. Spending a fortune on wasted diesel is also not the point. Feeding the plant is a monotonous routine. Dialing in these kinds of this is all the mental stimulation there is really. The whole job is, service the machine as needed, don't spin the tires, and NEVER let a aggregate bin go empty or put the wrong class in the wrong bin.