(つ◔౪◔)つ━☆゚.*・。゚ The 2020 TKSST Gift Guide ✩°。⋆・゚  
The Kid Should See This

Creating wood ash cement from scratch, an experiment

How do you make a cement-like building material that won’t dissolve in water? From scratch? In this Primitive Technology video, an experimental cement is made from crushed terracotta and refired wood ash that was burned from fallen eucalyptus bark and leaves. In addition to his process notes and research, he writes:

I think this material might have a potential use as a mortar holding rocks or bricks together in wet environments where limestone or snail shells are unavailable for making cement. Wood ash is a pretty ubiquitous material to most natural environments inhabited by people using biomass fuels. Wood ash cement turns a waste product into a valuable building material. From my research, wood ash is already being used as a partial replacement for cement in the building industry without decreases in strength of the final product. But I’ve only just started experimenting with it and don’t know its full capabilities and limitations. Calcium content of wood ash differs depending on the species of tree, the part of the tree burnt and the soil it’s grown on. Cautious experimentation is still required before committing to a hut built from this material.

Previously, watch making lime with Primitive Technology, barrel tiled shed & tiled roof hut, pottery from beach-harvested clay, growing cement bricks with bacteria, and from Minute Physics: Concrete does not dry out.

This award-winning video collection is reader-supported. Become a sustaining member to keep TKSST online and free for everyone, including teachers and parents who use it as a resource to spark learning and curiosity for kids.

🌈 Watch these videos next...

Curb Roller – How concrete curbs are made smooth

Rion Nakaya

The Problem with Concrete

Rion Nakaya

Making a cord drill & pump drill from sticks & rocks

Rion Nakaya

Making a Forge Blower – Primitive Technology

Rion Nakaya

Seashell inspiration: Growing cement bricks with bacteria

Rion Nakaya

How to build a grass hut – Primitive Technology

Rion Nakaya

Making a celt hatchet and an A-frame hut – Primitive Technology

Rion Nakaya

Barrel Tiled Shed & Tiled Roof Hut – Primitive Technology

Rion Nakaya

Concrete Does Not Dry Out – Minute Physics

Rion Nakaya