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Dear Richard</div>
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If the cement stays below 400 C it will last a long time. To make lime they burn limestone. To make Portland Cement, they add ground clay, about 20%. To make fireclay cement they add a lot more clay.
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The expectation withe fireclay cement is that the cement that has set will burn again and turn into powdered lime. The clay will ' fire' and provide some adhesion. </div>
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Brick walls are mostly held together by gravity, not cement mortar. Andi and I built stoves in Malawi out of bricks with no mortar and he suggested they worked a little better than the mortared ones!</div>
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Happy New Year</div>
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Crispin </div>
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<div class="PlainText">Amigoes,<br>
A colleague Brian Davis of coci Nica stoves asked me why does cement not break down as much as concrete when subject to heat when used as mortar in a brick stove .
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How would one best alter the mix to reduce thermal failure ?<br>
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Ref., the Coci Nic Stove by Brianand NAncy Davis in Nicaragua…<br>
Richard <br>
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