@Ann: One slight correction -- fly ash is a kind of coal ash, not the other way around. Fly ash means the light particles which are carried up with the flue gas; the heavy particles which don't float up are called bottom ash.
Fly ash contains very small quantities (less than 0.05%) of a number of harmful metals such as lead and cadmium. Given the small concentrations of these metals and the relatively small quantity of fly ash which is likely to be used in these coatings, I suspect that the chance of any significant environmental exposure from these coatings would be extremely low.
Of course, when you're talking about billions of gallons of coal ash in an impoundment, it's a different story. That's why I think it's unfortunate that EPA suspended its coal ash reuse program after the Kingston disaster. In my opinion, reuse helps prevent disasters by keeping coal ash out of impoundments and putting it into useful products.
Thanks for that observation, Chuck. Remote inspection/assessment/measurement/monitoring has been growing for some time in several areas. I thought it was kind of cool that this principle and the technologies are being applied to things like bridge inspection. It's interesting to find out that this smart paint isn't the only avenue of investigation.
I hadn't heard of fly ash before reporting this story. I think here the fly ash is being used to provide dimensionality (if that's the right word), bulk and strength to the paint: it seems to be the solid in the mix. That's interesting that coal ash, which is apparently one kind of ash classified as fly ash, is a waste product that needs a home, so to speak, although it sounds like it's also a possible polluting agent. I wonder if the fly ash becomes relatively harmless when it's mixed into the paint in the story? Or does repeated rain, and the effect of other elements slowly destroy the paint, releasing the pollutant into the atmosphere and ecosystem?
It's even more interesting that fly ash is being investigated for use in composites--thanks for that info, Dave, and all the links. And wouldn't it be cool if we could figure out how to re-use all kinds of industrial wastes.
This touches on what must be the fastest-growing, most innovative technical area in structural mechanics. For decades, bridges, buildings and other structures have been checked by inspectors. Lately, we've been seeing more remote monitoring and use of energy harvesting. And now here we have smart paint. And beyond that, the article mentions conductivity maps that can be used to create finite element models.
We often talk about how electronics is changing the consumer market, but we forget how civil engineering is being changed, too.
It's interesting to read about yet another beneficial reuse for fly ash. It sounds like the fly ash is being used to give strength to the coating, while the sensing strategy uses carbon nanotubes.
Believe it or not, there is actually a biannual conference called World of Coal Ash, which is all about (you guessed it) coal ash. Electric power generation produces so much coal ash that finding uses for it is a serious research topic.
The Kingston Fossil Plant disaster in 2008 -- in which over a billion gallons of coal ash slurry were spilled in Tennessee, destroying several homes and possibly contaminating local water supplies -- put a damper (deserved or not) on enthusiasm about beneficial reuse of coal ash. In response to the accident, the EPA suspended its Coal Combustion Products Partnership program, which up until that time had been a successful partnership with industry to investigate new uses for coal ash.
In fact, many people involved in beneficial reuse of foundry sand (where EPA also has had a successful industry partnership) were concerned that the accident would cast a shadow on all efforts to reuse industrial materials, even those which have nothing to do with coal. In 2009, EPA and USDA completed a draft risk assessment which essentially gave the green light to many kinds of foundry sand reuse, but the assessment has never been finalized -- possibly due to jitters from the Kingston disaster. In spite of this, industry efforts to reuse foundry sand seem to be moving forward.
This seems pretty cool. So by using this paint or coating on the structure, you get protection from the elements as well as a built-in way to detect structural problems and monitor integrity? While the paint/nanotechnology element is compelling and seemingly pretty cost-effective, what about the sensor and wireless infrastructure that has to be set up and maintained in order to monitor the feedback--is that pricey enough to take some of the utility out of this approach?
Earlier this year paralyzed IndyCar drive Sam Schmidt did the seemingly impossible -- opening the qualifying rounds at Indy by driving a modified Corvette C7 Stingray around the Indianapolis Motor Speedway.
Wearables are changing the way we see ourselves. With onboard sensors that have access to our bodies, we are starting to know our physical selves like never before, quantifying our activity, our heart rate, breathing, and even our muscle effort.
Last week, the bill for reforming chemical regulation, the TSCA Modernization Act of 2015, passed the House. If it or a similar bill becomes law, the effects on cost and availability of adhesives and plastics incorporating these substances are not yet clear.
This year, Design News is getting a head start on the Fourth of July celebration. In honor of our country and its legacy of engineering innovation -- in all of its forms -- we are taking you on an alphabetical tour through all 50 states to showcase interesting engineering breakthroughs and historically significant events.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.