HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Engineering Materials

Corn, Wheat & Rice Trash Make Concrete Stronger

NO RATINGS
View Comments: Oldest First|Newest First|Threaded View
<<  <  Page 2/3  >  >>
Elizabeth M
User Rank
Blogger
Re: Interesting use of these resources
Elizabeth M   4/16/2013 3:51:02 AM
NO RATINGS
Thanks for those links, Ann. I do remember reading your previous coverage, but always good to jog the memory, as one reads about so much. It's good to see this successful model being used and reused.

Ann R. Thryft
User Rank
Blogger
Re: Replenish the Soil?
Ann R. Thryft   4/16/2013 11:54:33 AM
NO RATINGS
You're absolutely right about "specific chemical requirements," which is what I said. But there's cellulosic and then there's cellulosic: they're by no means all the same. And the stuff we're writing about here is not leaf mold--which, BTW, can also vary widely in chemical content (for example, high tannin content in oak leaves).
Depending on its chemical composition, some cellulosic material adds nitrogen and other nutrients to the soil, some takes those out, and some doesn't do anything nutritionally, but does add bulk and loft, which is not always needed or wanted, BTW. The stuff being recycled here doesn't add much in the way of nutrients and/or can leach it out. It can also cause rot problems. This is a complex subject, which we touched on in the DuPont article. Check it out.

Ann R. Thryft
User Rank
Blogger
Re: Corn, Wheat & Rice Trash Make Concrete Stronger
Ann R. Thryft   4/16/2013 11:56:04 AM
NO RATINGS
Thanks, Greg, for those examples. Mud brick goes back at least as far as ancient Mesopotamia in the Near East.

j-allen
User Rank
Gold
Concrete fillers
j-allen   4/16/2013 2:02:26 PM
NO RATINGS
When I was in grad school the civil engineers would enter the annual concrete canoe contest where the teams would have to build a canoe entirely out of conrete and then race it against those of other teams.  Most broke up or sank before the finish line, but the builders did use unusual fillers to reduce the density.  One mix had a specific gravity of just 0.75, about equal to oak, and it had an amazing tensile strength, almost  two percent that of oak. 

Rob Spiegel
User Rank
Blogger
Re: Good use of waste
Rob Spiegel   4/16/2013 4:22:03 PM
NO RATINGS
You're right, Ann, that second generation of biofuels isn't getting the same coverage as the first generation. It's good to see this new industry is turning to non-food crops grown on non-food-ready soil.

William K.
User Rank
Platinum
Re: Concrete fillers
William K.   4/16/2013 5:19:25 PM
NO RATINGS
Evidently this ash is much different from "just a filler", used to reduce density. Foam peanuts are a filler that reduces density but does not add strength. The ash somehow enters into the chemical structure, which is totally different.

Ann R. Thryft
User Rank
Blogger
Re: Concrete fillers
Ann R. Thryft   4/16/2013 5:40:19 PM
NO RATINGS
William's got a very good point: there's a big difference between filler and an ingredient that chemically changes the mix. That's what this ash is: an ingredient that chemically changes the mix.

Ann R. Thryft
User Rank
Blogger
Re: Good use of waste
Ann R. Thryft   4/16/2013 5:43:32 PM
NO RATINGS
Thanks for seconding my point about second-generation fuels, Rob. That's the correct term to use, and it was invented to distinguish them from those based on food-based crops (among other things).

Ann R. Thryft
User Rank
Blogger
Re: Concrete fillers
Ann R. Thryft   4/17/2013 12:51:26 PM
NO RATINGS
j-allen, on first reading, your story about concrete canoes sounds like a cross between a Mafia movie and one about college students' jokes. OTOH, I know these things are real, because there's a cement ship on the beach south of the Santa Cruz harbor. According to the local history I've heard, this one was originally built as a supply ship in 1918, and then got towed over here to become an entertainment spot.
Here's the history:
http://www.santacruzsentinel.com/ci_17234906
and here's a better photo (scroill down a ways):
http://www.beachcalifornia.com/cement-ship-seacliff-beach.html



Charles Murray
User Rank
Blogger
Re: Concrete fillers
Charles Murray   4/17/2013 6:50:58 PM
NO RATINGS
Wow...corn, wheat and trash replace Portland Cement AND the concrete becomes stronger? I never woulda thunk it.

<<  <  Page 2/3  >  >>
Partner Zone
More Blogs from Engineering Materials
Several of the new and noteworthy 3D printers in this slideshow are breaking some boundaries in build volume, new metals printing techniques, or working with high-profile development partners to ensure very high-quality parts and controls.
United Launch Alliance will fly 3D-printed flight hardeware parts on its rockets starting next year with the Atlas V. The company's Vulcan next-gen launch vehicle will have more than 100 production parts made with 3D printing. The main driver? Parts consolidation and 57% lower production costs.
A new report from the National Institute of Standards and Technology (NIST) makes a start on developing control schemes, process measurements, and modeling and simulation methods for powder bed fusion additive manufacturing.
Although bio-based polymers face challenges from petroleum-based polymers, in certain markets they can displace the petro-based incumbents. Here are six new bio-based and renewable plastics for a variety of applications.
BASF has developed tools and initiatives to help engineers use more of its renewable materials in their designs, more effectively, as well as to build parts using them with more predictable performance.
Design News Webinar Series
3/31/2015 11:00 a.m. California / 2:00 p.m. New York
2/25/2015 11:00 a.m. California / 2:00 p.m. New York
12/11/2014 8:00 a.m. California / 11:00 a.m. New York
5/7/2015 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
May 4 - 8, Designing Low Power Systems using Battery and Energy Harvesting Energy Sources
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7


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.
Last Archived Class
Sponsored by Proto Labs
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2015 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service