C4S* Research and Development Project
*Calcium Carbonate Circulation System for Construction
Reducing CO2 Emissions by Replacing Concrete
Participating Institutions
The University of Tokyo, Hokkaido University, Tokyo University of Science, Utsunomiya University, Shimizu Corporation,Taiheiyo Cement, Masuo Recycl,
Outline of Research and Development
The group consisting of the University of Tokyo, Hokkaido University, Tokyo University of Science, Utsunomiya University, Shimizu Corporation, Taiheiyo Cement, and Masuo Recycle is implementing the NEDO Moonshot R & D Project "C4S Research and Development Project" (C4S : Calcium Carbonate Circulation System for Construction) with the aim of making a significant contribution to the realization of a carbon-neutral society and a resource-recycling society. In the project, CO2 that is thinly spread in the atmosphere and concrete waste generated by the demolition of structures that exist all over the world are regarded as construction resources. We are conducting various research and development on the new concrete for next generation that can be recycled many times and become carbon neutral, that is, calcium carbonate concrete (CCC), using only CO2, concrete waste and water. The current research and development issues of the project are classified into the following three categories.
Investigation of manufacturing principle and development of manufacturing technology for CCC, which is produced by flowing a calcium bicarbonate solution between concrete waste particles (aggregate for CCC) that are in close contact with each other, precipitating calcium carbonate crystals by various controls, and binding the concrete waste particles to each other
Development of efficient crushing method for concrete waste and efficient CO2 capture method using concrete waste for producing aggregate for CCC with optimum particle size distribution and carbonation rate
Examination of various issues for social implementation of CCC, including evaluation of various performances of CCC, development of design method of CCC structure, establishment of laws and standards required for CCC structure, optimal resource recycling scenario in C4S , and analysis of LCCO2 reduction effect in C4S ）
CCC*manufacturing process
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Researcher
