HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Page 1/3  >  >>
Ann R. Thryft
User Rank
Blogger
Re: Interesting use of these resources
Ann R. Thryft   4/23/2013 12:38:26 PM
NO RATINGS
You're welcome, Elizabeth. And I agree about the reuse model.

Ann R. Thryft
User Rank
Blogger
Re: Replenish the Soil?
Ann R. Thryft   4/22/2013 12:58:33 PM
NO RATINGS
Yes, the farmers just grow corn. And second, it's well known that not all organic matter is good to plow under--some actually leaches nutrients from the soil.

Charles Murray
User Rank
Blogger
Re: Concrete fillers
Charles Murray   4/20/2013 10:29:22 AM
NO RATINGS
I can back up J-Allen's story. When I was in engineering school, our civil engineering students also had a concrete canoe contest. Either it's a common practice for civil engineering students, or J-Allen and I went to the same school (University of Illinois at Chicago).

JGetaz
User Rank
Bronze
Re: Replenish the Soil?
JGetaz   4/19/2013 4:47:14 PM
NO RATINGS
I had read the DuPont article and I re-read it. I have four comments.
I own some DuPont stock so I wish them well.
I design concrete structures and I like what pozzolans do, so I'm happy to have more sources.
They and you talk to farmers other than those I see either making silage from cornstalks or plowing it under - or both, which is the primary similarity - they don't leave much in the field. I don't see any having trouble getting rid of such "waste." I've never talked to any who had any such "waste," either. They will often plant a rye cover crop over the winter for erosion control and to have something green to turn under in the spring, so the corn from last year doesn't "interfere with corn planting." Maybe this is it: they rotate their crops every few years; from the comment that the stover can "house insects and diseases that damage corn plants" it sounds like the Iowa farmers just grow corn.
I mentioned this to my 12th-grade daughter who had an immediate and strong reaction: "Anyone who takes AP Environmental Science knows that one wants to use any organic matter they have in their soil." She has that class this year.

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.

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



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   4/16/2013 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.

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.

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.

Page 1/3  >  >>


Partner Zone
Latest Analysis
Do you long for the days of retro video gaming? Here's how you can turn an old PC into an old-school arcade cabinet with only $100 and a bit of woodwork.
A Vienna, Austria-based startup called Heliofloat has designed a platform of solar panels that can be deployed in lakes or oceans to generate solar-based electricity.
Electrical engineers from the University of Washington and Delft University of Technology have developed a new type of sensor-based platform that harvests energy from radio waves for electricity.
A simple new chemical method for repairing and recycling notoriously difficult carbon fiber composites has been developed by the Fraunhofer Institute for Applied Polymer Research. An entire component can be completely recycled, including reclaiming its expensive carbon fibers for reuse.
In today’s connected world we are seeing the beginning of connected homes, smart grids, self-driving automobiles, drones, and many other amazing devices. Out of all the soon-to-be connected devices, which device poses the greatest dangerous to its users and society?
More:Blogs|News
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
May 2 - 6, Embedded System Design Techniques™ - Rapid Prototyping Embedded Systems using Micro Python
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6 |  7 | 8 | 9


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.
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Technology Marketplace

Copyright © 2016 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service