Concrete Incorporating 'CalCarbo', a Synthetic Calcium Carbonate that Fixes CO2, Adopted for the First Time in Public Works in Shiga Prefecture
Haikou Onoda Remicon, Idemitsu Kosan, and Nippon Concrete Industries have introduced concrete incorporating CalCarbo, which fixes CO2, into public river improvement projects in Shiga Prefecture for the first time.
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- 📰 Published: April 2, 2026 at 23:00
- 🔍 Collected: April 2, 2026 at 19:37
- 🤖 AI Analyzed: April 21, 2026 at 06:06 (442h 29m after Collected)
Haikou Onoda Remicon Co., Ltd. (Headquarters: Kyoto City, Kyoto Prefecture; Representative Director: Kazuhiro Yamauchi), Idemitsu Kosan Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; Representative Director and President: Noriaki Sakai), and Nippon Concrete Industries Co., Ltd. (Headquarters: Minato-ku, Tokyo; Representative Director and President: Yoshihiko Sugita) conducted trial construction at the Ane River and Gioui River in Shiga Prefecture using concrete mixed with synthetic calcium carbonate 'CalCarbo(R)' *1. The adoption of concrete incorporating CalCarbo is the first of its kind in Shiga Prefecture's public works. Moving forward, the three companies will expand their construction track record, centered around Shiga Prefecture, to accelerate the proliferation of this technology.
*1 Synthetic calcium carbonate in which CO2 from exhaust gas is fixed into concrete sludge (waste remaining at the final stage of concrete product manufacturing).
Since being selected for Shiga Prefecture subsidy programs in 2024 (the FY2024 Shiga Prefecture Near-Future Technology Social Implementation Promotion Project Subsidy and the FY2025 Shiga Prefecture SME New Technology Development Project Subsidy), the three companies have continued efforts toward the social implementation of concrete containing CalCarbo. Because it was confirmed that concrete incorporating CalCarbo possesses sufficient strength as a civil engineering and construction material, it was adopted for the first time in this river improvement project.
Conventional concrete is primarily composed of cement, water, and aggregate (sand, small stones, etc.). CalCarbo can replace a portion of the cement, realizing CO2 fixation in civil engineering and construction materials and the effective utilization of waste. Furthermore, by replacing part of the cement with CalCarbo, the amount of cement used can be reduced, leading to a reduction in CO2 emitted during cement manufacturing. This contributes to the decarbonization of the entire concrete manufacturing process. Notably, this construction project achieved a CO2 reduction of approximately 610 kg.
Looking ahead, the three companies will continue their research on concrete incorporating CalCarbo while expanding their construction track record by acquiring material certifications from public institutions such as the General Building Research Corporation of Japan (GBRC)*2, further promoting the widespread adoption of this technology.
*1 Synthetic calcium carbonate in which CO2 from exhaust gas is fixed into concrete sludge (waste remaining at the final stage of concrete product manufacturing).
Since being selected for Shiga Prefecture subsidy programs in 2024 (the FY2024 Shiga Prefecture Near-Future Technology Social Implementation Promotion Project Subsidy and the FY2025 Shiga Prefecture SME New Technology Development Project Subsidy), the three companies have continued efforts toward the social implementation of concrete containing CalCarbo. Because it was confirmed that concrete incorporating CalCarbo possesses sufficient strength as a civil engineering and construction material, it was adopted for the first time in this river improvement project.
Conventional concrete is primarily composed of cement, water, and aggregate (sand, small stones, etc.). CalCarbo can replace a portion of the cement, realizing CO2 fixation in civil engineering and construction materials and the effective utilization of waste. Furthermore, by replacing part of the cement with CalCarbo, the amount of cement used can be reduced, leading to a reduction in CO2 emitted during cement manufacturing. This contributes to the decarbonization of the entire concrete manufacturing process. Notably, this construction project achieved a CO2 reduction of approximately 610 kg.
Looking ahead, the three companies will continue their research on concrete incorporating CalCarbo while expanding their construction track record by acquiring material certifications from public institutions such as the General Building Research Corporation of Japan (GBRC)*2, further promoting the widespread adoption of this technology.