The Japanese architecture firm Atelier Tekuto teamed up with experts from the University of Tokyo to create a "100 percent renewable concrete material" known as shirasu concrete. Rather than using sand as fine aggregate, shirasu concrete uses the volcanic ash produced by a fast-moving current of gas and rock known as a pyroclastic flow—a natural resource found in abundance in the south of Japan’s Kyushu island. Atelier Tekuto’s principal Yasuhiro Yamashita commented on the economic befits that the concrete can bring Japan as well as its other positives:

Yamashita claims that not only is the concrete environmentally friendly, but also that its high density, absorption capacity, and natural pozzolanic reaction (which are cementitious) make it particularly strong and durable.

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