Improving durability and reducing environmental impact with fly-ash PC bridges
First written in FY2016. 6 of 7 entries say "Advanced", first in FY2023. Latest entry: FY2026.
2 other companies' latest entry also says "Advanced".
- FY2026AdvancedAnnual report
「We developed Steamless Precast Concrete, which achieves the required early strength without steam curing, and it was commercialized in fiscal 2025 for precast PC girders ordered by the Tohoku Regional Development Bureau, bringing the number of applications to 2. By fiscal 2025, 2 plants had obtained JIS certification for precast PC girders using Steamless Precast Concrete, and we are rolling it out to all plants.」
Steamless Precast Concrete progressed to its 2nd commercial application, and the number of plants with JIS certification reached 2. - FY2025AdvancedAnnual report
「We developed Steamless Precast Concrete, which achieves the required early strength without steam curing, and it was first adopted in fiscal 2024 for precast PC girders ordered by Okayama Prefecture. In addition, we are replacing at least 70% of the cement used in concrete materials, which emits substantial CO2 during manufacture, with blast-furnace slag fine powder, which produces lower CO2 emissions,」
The environmentally friendly concrete that eliminates the need for steam curing was first adopted in fiscal 2024 for precast PC girders ordered by Okayama Prefecture. We are also advancing development of technology to replace at least 70% of cement with blast-furnace slag fine powder. - FY2024AdvancedAnnual report
「We developed and commercialized fast-setting concrete for precast components that develops high early strength at ambient temperature, making steam curing unnecessary.」
Fast-setting concrete that eliminates the need for steam curing progressed from manufacturing tests and consideration of commercialization in the previous fiscal year to the commercialization stage. - FY2023AdvancedAnnual report
「Previously, precast components were steam-cured to accelerate the development of concrete's early strength during manufacture. Because steam curing uses boilers fueled by heavy oil, it produces substantial CO2 emissions. We therefore developed a fast-setting concrete for precast components that develops high early strength at ambient temperature, making steam curing unnecessary. Manufacturing tests on the components have been completed, and we are considering commercialization.」
Efforts to reduce environmental impact have progressed beyond the use of supplementary materials such as fly ash to completion of manufacturing tests and consideration of commercialization for fast-setting concrete that eliminates the need for steam curing. - FY2016First statedAnnual report
「We are constructing a PC girder bridge using fly ash at the Miyasaka Pedestrian Bridge in Ishikawa Prefecture. Going forward, we will continue promoting the use of fly-ash PC bridges and contribute to the development of high-quality social infrastructure and conservation of the global environment.」
The company is using fly ash to improve the durability of PC structures, reduce CO2 emissions and utilize previously unused resources.