The Ports and Airports Bureau of the Kanto Regional Development Bureau has for the first time ordered “a customer-specified pilot construction project using low-carbon materials.” The construction work targeted as "FY2020 Southern Breakwater Construction in Kashima Port Outer Port Area" is being handled by the Kashima Port and Airport Development Office, and "Kashima Port Outer Port Area" Tokyo Bay East Wave 2020 and Other Ancillary Facilities" of the Tokyo Bay Entrance Office.” 2 items. In both cases, the specifications include the use of concrete made from materials with low carbon dioxide (CO2) emissions.
This is the first pilot project based on the “Handbook for using low-carbon materials in port construction, etc.” developed in March. Through the pilot construction, we hope to clarify the issues involves the utilization and generalization of the use of low-carbon materials.
The construction of the south breakwater in the outer harbor area of Kashima Port is part of the south breakwater expansion project, which includes the construction of a caisson approximately 25 meters wide by 19.4 meters deep. meters, weighs about 5,900 tons and installs it in the south. Expanding the breakwater. In particular, the caisson cap block (4m wide, 4.1m deep, 0.7m thick, weighing about 26 tons) will be made of concrete with materials equivalent to type C blast furnace cement. It is believed that the amount of emissions CO2 from the material can be reduced by about 35% compared to conventional methods. It is expected to be announced on November 9 and bid opening on January 15, 2024.
The eastern seawall and other outbuildings of the Central Tokyo Bay Passage are related to the eastern seawall of the second sea fortress in central Tokyo Bay. Responsible for manufacturing and installing 19 concrete blocks to be installed inside steel pipe sheet piles. The block uses hydrated solidified steel slag instead of conventional B-grade blast furnace cement. Hydrated solidified steel slag is a product that does not use cement but uses ground blast furnace slag powder as a binder and steelmaking slag as aggregate. It has similar performance to cement concrete and can reduce material-derived CO2 emissions by about 80% compared to conventional methods.
Although the Tokyo Bay Line Office has a track record of using hydrated solidified steel slag in construction work, this is the first time this project has been undertaken as a pilot work specified by the customer for use. materials with low carbon content. The construction project was announced on October 30. Bidding is expected to open on February 2, 2024.
