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writing:building_materials [2025/12/03 01:44] – JacobCoffinWriteswriting:building_materials [2025/12/03 01:56] (current) – JacobCoffinWrites
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 The big difference is financial cost and inertia. Portland cement has been around for a long, long time, and the industry has had a lot of time to make improvements to their processes to drive down cost. It's also a known factor - civil engineers tend to appreciate consistency and Portland cement is a very well-understood material. They have entire books on its performance and limits in various conditions, and procedures for mixing, transporting, and pouring it in just about every circumstance you can imagine. The big difference is financial cost and inertia. Portland cement has been around for a long, long time, and the industry has had a lot of time to make improvements to their processes to drive down cost. It's also a known factor - civil engineers tend to appreciate consistency and Portland cement is a very well-understood material. They have entire books on its performance and limits in various conditions, and procedures for mixing, transporting, and pouring it in just about every circumstance you can imagine.
  
-That institutional familiarity isn't there yet with geopolymers, so choosing to use it in a project probably feels like a risk.+That institutional familiarity isn't there yet with geopolymers, so choosing to use it in a project probably feels like a risk.  
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 +That said, a solarpunk society is likely one that actually tracks its externalities and tries not to produce waste it can't account for, and once you factor in the true costs of Portland cement, the mining, the transportation, the CO2 production, geopolymers are a rather straightforward replacement.   
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 +=== Cob === 
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 +Cob is also popular with the self-sufficiency types who build thermal mass heaters and [[https://insteading.com/blog/rocket-mass-heaters/|rocket]] [[https://commonsensehome.com/rocket-mass-heaters/|mass]] [[https://permies.com/t/265979/dry-cob-rock-solid-frame|heaters]].  
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