Taisei Corporation has manufactured prototypes of railway sleepers utilizing its proprietary environmentally friendly concrete, "T-eConcrete." By replacing the vast majority of conventional cement with blast furnace slag—a byproduct of steel manufacturing—the new product reduces carbon dioxide emissions during production by up to 90%. Through this initiative, Taisei aims to expand the applications of T-eConcrete and drive international expansion tailored to the specific market demands and regulatory standards of various countries, with a primary focus on Europe.

The prototyping was achieved through a joint development and manufacturing collaboration with Mitsui & Co., Ltd. and Germany-based PCM RAILONE AG, a leading European manufacturer of concrete railway sleepers. In addition to the effective utilization of blast furnace slag, the manufacturing process incorporates calcium carbonate that has absorbed and trapped CO2, effectively sequestering the greenhouse gas within the concrete. This approach yields an 80% to 90% reduction in CO2 emissions during the manufacturing phase compared to standard concrete sleepers.

Furthermore, the T-eConcrete sleepers exhibit rapid, high-strength development, achieving a compressive strength of 45 Newtons per square millimeter within just one day, and exceeding 50N by day seven. This rapid hardening profile eliminates the need for steam curing—a standard process used to accelerate strength development in precast concrete manufacturing. Consequently, the energy consumption typically required to generate steam is entirely bypassed, further lowering the product's carbon footprint.

According to Taisei Corporation, the procurement of regional raw materials is paramount to the successful overseas deployment of the T-eConcrete sleepers. To address this, the concrete mix design for the prototypes was meticulously engineered using materials fully sourcable within Europe. The resulting mixture delivered the precise concrete fluidity and early-stage high-strength development required for sleeper production, enabling successful pilot manufacturing at the local European facilities. (2026/05/12)