PaperKrete production

Papercrete is easy to produce but requires accurate measurements. It is important to weight the newspapers before soaking them. The standard process to make the mix is:
• Soak newspaper in water overnight to soften the fibres and make mixing easier.
• Mix the soaked paper until it becomes a homogeneous pulp.
• Add Portland cement, sand and water.
• Blend into a concrete mixer or similar machine (Papercrete Tow-Mixer) the ingredients until the mix becomes a thick consistent pulp.
• Pour mix into forms (wooden or metal) to create blocks of any size and shape. To maximise the benefit of re-use of moulds, steel moulds must be used. They have long life span providing thousands of re-uses and also reduction of waste.
• Remove the forms (after 7 days in a wet climate)

http://www.youtube.com/watch?v=XYv2POqyz0c

1.Make wooden forms…

…or use the plastic forms used to make concrete


2.Soak newspaper overnight

3. Make the paper pupl (I used x-shaped head drill)

3. Weight cement and sand

4. Pour cement and sand into the paper pulp

5. Mix all the ingredients for approx. 10 minutes6. Pour the mix into the wooden or plastic forms

7. Vibrate the mix to remove the air

8. Let the specimens dry for at least one week ( Drying time varies in different climates and water content percentage on the mix)

9.Remove forms

10. Clean the forms and the Laboratory

11. Let the specimens dry for 2 week more (drying time varies fot the same reasond mention above) to take their final properties.



12. Specimens ready to be used or tested

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About Menelaos Kokkinos

Menelaos Kokkinos TU Delft mgkokkinos@gmail.com
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10 Responses to PaperKrete production

  1. Great post dude! I love it! Can I link you on my blog? It’s http://www.regenerative-studies.com . Check it out! I just made a post about a papercrete house designed for people in Tijuana have a look see and get back to me!

    • Thank you. Of course you can put a link to your blog. I start reading your posts and it looks really interesting. Keep up the good work. If you need any further information let me know.
      Cheers

  2. I was just wondering what kind of problems, if any, there are with water and moisture?

    • The proportion of water is really important. Adding more water will prolong the drying period and increase the possibilities of moisture in the final product. From the other hand if you add less water you might have cohesion problems and the mix wont be homogeneous enough.
      I was working in a humid environment (Netherlands), so I had a lot of water problems, especially related to drying period. Moisture comes later. I kept some specimens after my presentation and they just started to appear some moisture in the corners. (after more than a year)
      There are plenty insulating materials in the market which will prevent moisture. I chose not to use to keep the material pure.

  3. kumar says:

    Why is it that nobody is bothered about the amount of water that is being used..?…Is there nothing like an optimum amount of water that has to be added to cast the blocks…?

    • The amount of water is really important. Excess water will prolong the drying period, few water might create cohesion problems and the mix wont be homogeneous enough. The exact amount depends on the climate and the of course the production method. I was working in a humid environment (Netherlands), so I had a lot of water problems, especially related to drying period.

  4. kumar says:

    How do you do the consistency test for fresh paper crete….?..like do you do the slump test or the kellyball test or some other test…?

  5. Marc says:

    Hello.

    Would it be possible to insert cast papercrete into an oven to dry them faster?

    Awaiting your input.

    Marc

  6. bandara says:

    Very valuable good article. Can it use sawdust also for alternative.

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