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Abstract: Japanese national expressway company known as NEXCO (Nippon Expressway Company ltd.) has developed mid-flow concrete to improve the workability and overall quality of secondary tunnel lining. This new concrete was standardized in July 2013. In recent years, it has become more popular to use mid-flow concrete with increased viscosity, which often is produced by utilizing thickenercontaining...
Abstract: Nippon Expressway Company Limited (NEXCO)’s tunnel lining detailed inspection system carries out desk checking of the image photographing records of lining surfaces from the inspection image acquisition system and is made up of a combination of desk checking extracting important inspection points as well as implementation checks by an engineer. Both inspections evaluate Tunnel-lining Crack...