Primitive Technology: Wood Ash Cement

Eucalyptus tree (any tree will do) Fallen bark and leaves The kiln Hot coals Burning a lot of material for its ash Ash falls through grate Fine white ash with nearly no charcoal in it Adding ash to water Stir well Tip off excess water containing potash Retain the paste which contains the insoluble calcium hydroxide and calcium carbonate Compress into pellet Take it to the forge (a kiln would also do on a larger scale) Heat the pellet to an orange heat Extract the pellet and let it cool Slake pellet in water Stir Crush up old terracotta tiles (from previous project) Add terracotta as aggregate (sand or gravel may also work though I’ve only tested this type) Form into shape Here’s one I prepared 3 days earlier It has set hard Most importantly it will not dissolve in water Wood ash cement

100 Replies to “Primitive Technology: Wood Ash Cement”

  1. I think I have the chemistry right. If any chemists are watching correct me if I'm wrong. The calcium compounds are converted to calcium oxide in the second firing, turn to calcium hydroxide in the water and then set to calcium carbonate in the air. There maybe a pozzolanic effect due to the alumina and silica in the ash too. The end product is a cube made only from wood ash (fired twice) and crushed pottery. It sets hard after 3 days and will not dissolve in water even when fully submerged for 24 hours. Thanks.

  2. Аналог портланд-цемента получается… Если найдёте выход бишофита – можно будет сделать из него цемент Сореля, достаточно крепкий и долговечный материал.

  3. Our ancestors used same kind of technology to build temples ,houses and stupa.they also add black lentils,rice husk(weather proof) and lime powder to make it more strong ….(Nepal).in some places they also add milk to supplement was said that during that time milk was abandant in king's palace..One king even thought of making milk pond..presently it is known as Rani Pokhari..(KATHMANDU).

  4. You could try adding crushed limestone, or lime slake (burn the limestone in a hot fire first then place into water – be careful it’s very acidic at this stage), and add the mix with your own recipe, experiment necessary to get the right proportions. This add a degree of plasticity for working the material, and should assist the mortar by way of hardening over a slightly longer period that will add strength and durability…

  5. Consider try making a firebox and chimney with this cement. The ability to have a safe inside fire is of tremendous value. Sheltered from rain and wind. More efficient heat, you are warmer and your firewood supply lasts longer.

  6. My only question is:

    “Will I be able to watch all of these videos of yours when the world ends- or will the EMP just wipe out my phone?” 🤔 if it does- I’m fucked.

  7. Hey…..I didn't know cave men had a camera to record himself.

    I'm sure that part of the forest is in his back yard….lol

    But either way…….great video and a great way to escape modern civilization stress and return to nature.


  8. Я давно использую древесную золу в растворах цемента или в бетон .Качество растворов значительно улучшаются .Затвердевание или схватывание ускоряется .Твёрдость улучшается .Цвет бетона приобретает синеватый цвет ,как улучшенная марка бетона .Этот раствор или бетон не боится воды зимой .

  9. Fascinating. I was just reading today the Bible verses that talked about the building of the ancient Tower of Babel. They made the bricks in exceedingly hot fire and they had slime for mortar.

  10. If society were allowed to experiment energy would no longer be a problem. Accordingly your method would take off but lack of oxygen will one day prove too much for the human biology. This can be seen by dogs because they are always short of breath these days.

  11. This could be a theory to how ancient megaliths were cut so perfect. Every other block was cut, the gaps in between, caused a mix of limestone, and this kind of stuff. Same as pyramids, sacsayhuaman, and others.
    It answers the question of how they got the joints so damn perfect.

  12. So now they use white guys, ( destructive predators) to pretend like they are the natives who invented these techniks. Use natives not destructive white wanna be natives.

  13. The terracotta is a clay/cement type product that has already been fired, so really you are just using it's bonding capabilities with the ash as a filler (like sand is in concrete). Use all virgin materials and this would have been much better since terracotta is not normally just lying around. Just a suggestion.

  14. Pyramide egypte

    And Pharaoh said, "O eminent ones, I have not known you to have a god other than me. Then ignite for me, O Haman, [a fire] upon the clay and make for me a tower that I may look at the God of Moses. And indeed, I do think he is among the liars."

  15. Ты походу строитель.давай к нам в Россию, здесь дома будешь строить,и камины.,🏠не плохо платят.

  16. IS the wood ash cement substantially stronger than the tercotta, and does it approach modern cement in strength?

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