(Construction) - A group of five universities and three companies including the University of Tokyo, Shimizu Corporation, and Taiheiyo Cement Corporation announced on April 19 that they have developed the basic technology to produce recycled concrete by mixing carbon dioxide in the air.
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| Carbon neutral concrete mixed with CO2 in atmosphere. |
It can absorb the same amount of CO2 as that emitted during the manufacturing process of existing concrete, which will contribute to the reduction of CO2 emissions. The technology is expected to be commercialized in 2030, with the aim of widespread use around 2050.
The newly developed technology, named as Calcium Carbonate Concrete or CCC is an eco-friendly method of concrete that can be recycled repeatedly. Calcium carbonate is forcibly deposited between the particles of crushed used concrete to unify them. The amount of CO2 absorbed during the production process is greater than the amount of CO2 emitted in the past use. The advantage of the technology is that it can be manufactured locally with materials such as calcium derived from concrete CO2 in the atmosphere, and water. It will be possible to reduce CO2 emissions by 20 million tons per year and fix 6.2 million tons of CO2 per year by 2050, when a half of the total traditional concrete production is replaced with CCC .
Professor Takafumi Noguchi of the University of Tokyo's Graduate School of Engineering said at the press conference, "We hope to solve the issues of distribution and offer the product at the same cost as normal concrete”(2021/04/20)
The Daily Engineering and Construction News of Japan
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