Would this not make it unbreathable?

…the powdered cement. What results is not Portland cement, but Limestone Calcined Clay Cement (LC3). This cement has a bunch of good properties that makes it more durable, stronger, and more impervious to water and corrosive chemicals, so there’s a strong upside.
Replacing Some Cement With Baked Clay Helps But Isn’t A Slam Dunk
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Michael Barnard
Carl St. James
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Sep 30, 2024
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Would this not make it unbreathable? We don't necessarily want walls that are completely impervious to water because they don't allow the buildings to breath.
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Written by Carl St. James788 Followers
·125 Following
Making sense of modern technology, design and culture.
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