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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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Products: French cement-free concrete?

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      CommentAuthordjh
    • CommentTimeMay 6th 2016
     
    I heard about a cement replacement that supposedly requires no heat to make it. But I'm having trouble understanding exactly what it is and whether it is a real green product. Does anybody know anything about it? Or can discover any more?

    It is described at http://www.hp2a-technologies.com/

    It says: "The HP2A project was born when David Hoffmann, a scientist specialized for more than 20 years in mineral binder’s chemistry and Julien Blanchard director of Argilus, a major representative in the French eco-construction market decided to join forces.
    A Patent called “HP2A” was created and registered at the INPI on the 27th March 2015 N°15 52615"

    But when I search INPI for that French Patent, it appears to say it was issued in 1968 to an American company. I expect I don't understand INPI's English on their site.
  2.  
    The product is currently being launched(2017) and will be called Argiwest.

    The product/invention is a mix of clay and sand. The engineer has invented process of molecular reaction in the clay so that the clay molecules are combine in a covalent bond, essentially creating something that resembles stone. The reaction takes place without requiring energy intensive heating or drying of the product. The resultant bonding of clay molecules is apparently strong enough to rival cement. At least this is my understanding of how the product works, I could be wrong.

    lots of info here:
    http://www.hp2a-technologies.fr/presse-media/
    • CommentAuthorgyrogear
    • CommentTimeMay 6th 2016
     
    "French cement-free concrete"

    well, I use this stuff already, I just replace OPC by lime

    (in fact the roman colosseum uses the same stuff)
    http://www.tribunesandtriumphs.org/colosseum/building-the-colosseum.htm

    gg
    • CommentAuthoradi
    • CommentTimeMay 6th 2016
     
    Lime is definatly more enviromently friendly than cement but it still takes large amount of heat to create!

    http://www.britishlime.org/education/how_lime_is_made.php
  5.  
    Dont think many people realise that OPC is just a mixture of Lime and Clay (which has been baked).
    •  
      CommentAuthordjh
    • CommentTimeMay 6th 2016
     
    And although I'm generally in favour of lime (I have a house covered in it), the lime brigade do tend to overstate its benefits. The Bath Inventory of Carbon and Energy (ICE) shows that the difference in energy required for production is frequently overstated, and then lime is typically used in richer mixes than OPC, so more is used to achieve the same end.

    So finding something that could do the same job without having to use heat to manufacture it would be a major piece of good news. I hope this is it.
  7.  
    And whats even more funny is that clay is ...lime, dissolved from limestone and washed down to river beds.
    • CommentAuthorTriassic
    • CommentTimeMay 6th 2016 edited
     
    Posted By: bot de pailleAnd whats even more funny is that clay is ...lime, dissolved from limestone and washed down to river beds.
    And a few million years will be rock again!
    •  
      CommentAuthordjh
    • CommentTimeMay 6th 2016
     
    Posted By: bot de pailleAnd whats even more funny is that clay is ...lime, dissolved from limestone and washed down to river beds.

    Limestone is calcium carbonate and various other forms of lime are different compounds of calcium. The important things in clay and in pozzolans are silicates of various types.

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