New study: Japan creates special concrete that absorbs more CO2 emissions

DNVN - According to a VNA reporter in Tokyo, a research group in Japan has just announced a method of making concrete that emits almost no carbon dioxide (CO2) during the production process.

Researchers in Japan have just found a way to make concrete that emits almost no carbon dioxide during production. Photo:asahi.com

Scientists, mainly from the University of Tokyo and Hokkaido University, say the material has the potential to absorb more CO2 than it emits. They are now seeking certification under the Building Standards Law with the goal of putting it into practical use by fiscal 2029.

Professor Takafumi Noguchi at the University of Tokyo, a member of the research team, said that the minimum requirements for commercializing CO2-neutral concrete have been met.

The current concrete production process still inevitably emits CO2. First, the production of cement, one of the main ingredients of concrete, inevitably leads to CO2 emissions. The process of firing limestone or calcium carbonate mixed with clay and other raw materials to produce concrete also releases CO2 due to the thermal decomposition of calcium carbonate. In addition, the burning of fossil fuels to reach the required firing temperature of about 1,450 degrees Celsius also increases CO2 emissions. Therefore, the cement industry contributes a large part to Japan's total emissions, about 4%.

To reduce these emissions, the team developed a concrete production process that does not require high-temperature firing. In this method, concrete waste is crushed and exposed to CO2, creating calcium carbonate from the calcium in the waste. The mixture is then shaped and compressed so that the calcium carbonate particles bond together. Finally, heat is used to complete the process.

Scientists have shown that concrete produced using this technique emits less CO2 than it absorbs.

In a statement on October 30, the research team said their concrete meets the durability standards set by the Building Standards Act. The researchers are now evaluating the performance of the concrete material when combined with steel pipes and other accessories for use as building pillars.

Professor Noguchi stressed that the team will try to improve production efficiency without compromising the quality of the material.

Cao Thong (t/h)

Source: https://doanhnghiepvn.vn/cong-nghe/nghien-cuu-moi-nhat-ban-che-tao-be-tong-dac-biet-ap-thu-nhieu-hon-phat-thai-co2/20241031093218095