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Primitive Technology - S2024E05 - Geopolymer Cement (Ash and Clay)
 

Primitive Technology season 2024 episode 5

Geopolymer Cement (Ash and Clay)

 
I have made wood ash cement before under the assumption that it was the calcium in the ash that gave it its cementitious properties. It may however be a type of geopolymer cement, where the cement is activated by and acid or a base (in this case a base). The acronym NASH is used to remember the material needed: sodium, alumina, silica and H2O. All of these are present in the materials used here. I did some experiments to see how to produce the cement using ash and fired clay from broken bricks. The first method was to take ash from a cold fire and form it into pellets. One pellet was left aside to dry while the others were calcined by firing them in a forge with wood. The calcined pellets were then mixed with terracotta in different proportions (ash: clay 1:0, 1:1, 1:2, 1:3). All samples survived a water test after setting for a week except for the sample made from cold ash that had not been calcined. This demonstrates the need to calcine the ash at a high temperature before use. Next
 
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Primitive Technology / S2024E05 : Geopolymer Cement (Ash and Clay)
Season 2024, Episode 5 | Aired on May 2, 2024 | 10 min. | YouTube
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EPISODES
Season 2024
Season 2024
Season 2024
Season 2024
Season 2023
Season 2022
Season 2019
Season 2018
Season 2017
Season 2016
Season 2015
 
 
  • Primitive Technology - Episode 1 - Crab and Fish Trap
    Episode 1
    Crab and Fish Trap
  • Primitive Technology - Episode 2 - One Way Spinning, Rope Stick Blower
    Episode 2
    One Way Spinning, Rope Stick Blower
  • Primitive Technology - Episode 3 - One-Way Blower Iron Smelt & Forging Experiment
    Episode 3
    One-Way Blower Iron Smelt & Forging Experiment
  • Primitive Technology - Episode 4 - Wet Season Destroys Thatched Workshop
    Episode 4
    Wet Season Destroys Thatched Workshop
  • Primitive Technology - Episode 5 - Geopolymer Cement (Ash and Clay)
    Episode 5
    Geopolymer Cement (Ash and Clay)
 
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