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Showing posts from March, 2026

Turn sand into near cement strength/build a sand home!

 That YouTube video from The Buried Vault (uploaded very recently) is fascinating—it's all about a low-voltage electrical process (just 2–4 volts) that turns seawater-soaked beach sand into solid, stone-like rock in minutes, with no cement, no high heat, and no CO₂ emissions. youtu.be Researchers at Northwestern University demonstrated electrodeposition: they run a mild DC current through sand saturated with seawater, causing dissolved minerals (calcium, magnesium, etc.) to precipitate as crystals that bind the sand grains together. The result has compressive strength in the range of weak concrete, and it's fully reversible (flip the polarity and it dissolves back into loose sand). This echoes the earlier "Biorock" work by architect Wolf Hilbertz from the 1970s, who grew limestone structures underwater on metal frames using the same principle, achieving strengths comparable to commercial concrete.The video also touches on a parallel biological approach using bacter...