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Materials & Assembly

Smart Paint Detects Microscopic Cracks

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Beth Stackpole
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Two birds with one stone
Beth Stackpole   2/13/2012 7:01:31 AM
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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?

naperlou
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Re: Two birds with one stone
naperlou   2/13/2012 9:40:46 AM
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Beth, the sensor itself should be quite inexpensive.  In addition, sensor networks using the Zigbee standard can be quite inexpensive, low power and are self organizing.

Dave Palmer
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Another use for fly ash
Dave Palmer   2/13/2012 10:24:57 AM
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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.

Dr. Pradeep Rohatgi, at the University of Wisconsin-Milwaukee, has done a lot of work on aluminum-based metal-matrix composites incorporating fly ash, starting in the 1990s and continuing to today.  The use of fly ash reduces the weight of the castings, and also improves the high-temperature strength, among other properties.  Much of this work has been done in collaboration with Eck Industries.

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.

Charles Murray
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Civil engineering revolution
Charles Murray   2/13/2012 12:12:53 PM
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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.

Ann R. Thryft
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Re: Another use for fly ash
Ann R. Thryft   2/13/2012 12:24:28 PM
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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.


Ann R. Thryft
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Re: Civil engineering revolution
Ann R. Thryft   2/13/2012 12:25:17 PM
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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.


Dave Palmer
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Re: Another use for fly ash
Dave Palmer   2/13/2012 1:14:58 PM
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@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. 

Ann R. Thryft
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Re: Another use for fly ash
Ann R. Thryft   2/13/2012 1:44:04 PM
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Thanks for the correction. The article I read for background was badly written and implied the opposite relationship. I'm glad to know that fly ash is relatively harmless, which was implied in the source materials for the smart paint story. I agree with you about reuse, and that's one of the reasons I like writing about recycling plastics into bridge materials, for instance. Sounds like a major problem is how to store fly ash in huge quantities without harm to the environment.


Tom Barker
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Iron
Brake Springs
Tom Barker   2/14/2012 11:35:14 AM
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Interesting article; Airbus should take note... 

This same concept has been used on brake springs for decades.  The paint can indicate too much stress and/or overheating.

Ann R. Thryft
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Re: Brake Springs
Ann R. Thryft   2/14/2012 12:07:38 PM
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Tom, that's very interesting, that a similar concept has been used on brake springs. What exactly is similar? Do you mean a similar principle or method of fault detection, including remote wireless detection, or mixing with fly ash, or all of the above? Please let us know.


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