Kashima Corporation has introduced embedded formwork using carbon negative concrete "CO2-SUICOM", which emits less than zero carbon dioxide (CO2) during the manufacturing process, for the first time in expressway bridge pier construction. 100% reduction in normal CO2 emissions and 10% more CO2 absorption. 59 kilograms of CO2 was immobilized per pier. By using embedded formwork, CO2 emissions were reduced, and at the same time, streamlining of the bridge pier construction process was realized by omitting the work of removing the frame.
Integrated formwork installation scene (from press release material)
The system was installed in the "Ebie Construction Area Cut-and-Cut Tunnel Construction" (ordered by Hanshin Expressway Company), which is being constructed in Fukushima Ward, Osaka City. The construction period is from June 2019 to March 2024. It was adopted as an embedded formwork that can be used for a part of the structure without removing it after concrete is placed.
In the same construction, after connecting the embedded formwork with steel materials to make it larger, the embedded formwork was set in place and installed. After the installation of the embedded formwork was completed, concrete was placed to complete the embedded formwork for the piers. The total amount of concrete used for the embedded formwork installed on the bridge piers was 2.68 cubic meters, and CO2 emissions were minus 59 kilograms.
Since the embedded formwork becomes a part of the structure as it is, it is possible to move to the next process without removing the formwork, which also contributes to the improvement of construction productivity.
