The project used earth bricks to build a workshop building. On that building they used cement mortar between the bricks.
They found that did NOT work well. The mortar liked to break away from the bricks. The building itself is really neat looking, but the combination of cememt mortar and earth bricks really didn't work.
For the building worked on in the video, it DOESN'T use cement. Each brick gets an earth slurry, which makes the edges sticky and seals it to the other earth bricks it touches.
As far as I could tell, it seemed to make a very solid bond.
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