Proof the Outer Layer of the Pyramids Was Made with Cast in Place Cement

A ground level block in front of the Great Pyramid of Khufu includes an irregular lip at the bottom. This lip indicates that the block was cast in place.
A ground level block in front of the Great Pyramid of Khufu includes an irregular lip at the bottom. This lip indicates that the block was cast in place.

This is the evidence I’ve been waiting. For several years now I’ve been hoping to find close-up detailed photographic evidence of Michel Barsoum’s and Joseph Davidovits’s theory that at least part of the Giza pyramids were cast in place using an ancient type of geopolymer. Well, here it is.

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Rammed Earth Block Machine Makes Clay Materials Harder than Concrete

Watershed Materials concrete block made with waste clay materials are now available in northern California.
Watershed Materials concrete block made with waste clay materials are now available in northern California.

Guest post by Alex Wright of Watershed Materials, the company who’s making geopolymer concrete blocks out of waste clay materials. We’ve covered their exciting development in two previous blog posts. This article focuses on their rammed earth block machine.

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Ingenious New Building Method Replaces Concrete Block with Rammed Earth

David Easton’s rammed earth block house in Napa, California
David Easton’s rammed earth block house in Napa, California

This may be the biggest story of the year. I just found out more information about the clay masonry blocks we reported on the other day. It turns out they were invented by rammed earth expert David Easton, and the blocks are already for sale in northern California in the San Francisco area. That means the development of Watershed Materials earth blocks are much farther along than I realized. This is VERY good news for natural builders and so I will do additional blog posts on this subject. Today’s blog post is about David Easton’s new home that’s made with these clay blocks.

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Sinker Wood


““Sinker” is simply a term for a log that sank to the bottom of a waterway during transport, or the bottom of a holding pond while it was waiting for processing. They’re also referred to as “deadheads.” These big logs sank a very long time ago (sometimes over 100 years ago!) and they remain there until they are “rediscovered.”

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Watershed Materials Develops Clay Masonry Twice as Strong as Concrete

Geopolymer is stronger than Portland concrete and has a very low-carbon footprint
Geopolymer is stronger than Portland concrete and has a very low-carbon footprint

California-based startup Watershed Materials, with support from the National Science Foundation, has spent the last four years researching and developing a concrete alternative. Currently, their studies have produced a masonry created with natural, mineral based geopolymers, that has incredible strength and very low-carbon footprint.

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