A research group led by Professor Yuya Sakai of the Institute of Industrial Science, University of Tokyo has succeeded in developing new civil engineering and building materials by crushing and mixing concrete debris and waste wood.No new cement is required in the regeneration process, no by-products are generated, and it seems that there are expectations for the recycling of a large amount of concrete debris.
According to the University of Tokyo, the research group crushed concrete debris and waste wood, mixed them, and then compressed them while heating to complete a new civil engineering and building material that fused concrete and wood.This recycled concrete has a characteristic that the bending strength is several times higher than that of the conventional concrete.
Lignin, one of the components of wood, is a fusion of concrete and wood.Since lignin is contained in many plants, we conducted experiments with vegetables and fallen leaves instead of waste wood, and confirmed that concrete could be adhered.
Approximately 3,500 tons of concrete debris are generated annually in Japan.For this reason, the development of recycled materials has been promoted for a long time, and the recycling rate is as high as 98%.However, about 9% of them are buried under the pavement surface when constructing roads as roadbed materials, and have not reached the ideal recycling for circulation.
Cement is required when making concrete, but a lot of carbon dioxide is generated when making cement.For this reason, the need for recycling of debris has been called for from the perspective of preventing global warming.
