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Human Bones + Nanoengineering = Green Concrete?

Greenconcrete_2 The following post may seem a little esoteric, if not absolutely dry, but don’t be intimidated.  Bear with me a second as the idea opens up towards the end of this article.  Every year, roughly 1.89 billion tons of cement (the main component of concrete) are manufactured.  Cement accounts for about 7-8% of all human-generated CO2 emissions (a main ingredient in the recipe for climate change).  Here’s what happens: cement is made by burning fossil fuels to heat a limestone and clay powder to 1500 °C.  Then, the resulting cement powder is mixed with water and gravel and the invested energy in the powder is released into chemical bonds that form calcium silicate hydrates.  Those calcium silicate hydrates bind the gravel to create concrete. 

So, the idea goes, human bone could show us how to manufacture concrete with less CO2 emissions.  Human bone achieves a similar packing density to concrete at the nanoscale, but with human bone, this packing density is achieved at body temperature with no extra release of CO2.  Stated otherwise, bone strength is achieved naturally without having to heat powder at a high temperature, and thus, without the CO2 release.  The problem is, however, the hardening of apatite minerals in the bone takes a long time.  Say, a month or more. 

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Hamiltons Castle House Will Blow Your Top Off (S2)

Turbines

This incredible design scheme is Castle House by Hamiltons of London.  Located at Elephant and Castle, the project will have two buildings: the 43 story tower with 3 nine meter diameter wind turbines at the top and the 5 story pavilion building on the side.  I’m not really sure what stage of development the project is in, but it was supposed to start in mid- to late-2006.  With completion projected for 2009, the residential project is targeting an "excellent" rating under the EcoHomes certification system.  When complete, Castle House will have 310 apartments comprising 247,500 sf and retail units on the ground level.  More images and modeling below the jump.  Via WAN + WAN

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Green Roofs, Cleantech Investments, Monster Homes + Stellar LEED Returns (WIR)

Week in Review
  1. Rooftop vegetation and gardens are catching on–though there are still many questions about how and when to apply the technique. 
  2. Cleantech venture capital investments are small but growing. 
  3. Monster Homes: Enough is Enough – some places will make you pay for that big thing. 
  4. Developer sells its LEED certified project and it was "certainly a stellar return." 


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