Evaluation on basic properties and surface quality of PCa members using scallop shell sand concrete with blue carbon fixation

With carbon neutrality gaining importance as one of the measures against global warming, the building industry is focusing on the development of environmentally friendly building materials to help realize a sustainable society. Japan has the second longest coastline in the world, and its fisheries industry along the coast is well developed and fisheries resources are considered important. In Hokkaido in particular, approximately 400,000 tons of scallops are landed annually, with approximately 110,000 tons of shells becoming waste. In order to make effective use of these discarded and unused resources, the development of blue carbon concrete components, in which scallop shells are partially replaced as fine aggregate, is underway. Blue Carbon certification has been initiated for algae. This technology has the potential to contribute to carbon neutrality by contributing to the reduction of the large amount of carbon dioxide emissions and the generated in the conventional cement production process and to the effective utilization of resources. In this study, it is covered exterior precast concrete members (PCa members) utilizing scallop shells. It was investigated the effects of performance and casting time between different types of concrete. This initiative is aimed at the practical application of environmentally friendly building materials for a decarbonized society, and is also expected to contribute to the construction of a resource-recycling society.