In a groundbreaking study, researchers have unveiled the potential of air-cooled blast furnace slag (ACBFS) as a sustainable subgrade material for tram projects, challenging traditional practices in railway construction. Conducted by Bin-Chen Benson Hsiung from the Department of Civil Engineering at National Chung-Hsing University in Taiwan, this research not only highlights the material’s unique properties but also its commercial viability for the construction sector.
ACBFS, typically ground into powder and mixed with concrete, has now been examined for its direct application as a subgrade material. The study, published in ‘Results in Engineering’, reveals that ACBFS boasts high porosity, low density, and exceptional drainage capacity, making it an ideal candidate for supporting embedded track slabs. “Our findings suggest that ACBFS can significantly minimize settling under tram loads while requiring less material than conventional alternatives,” Hsiung stated, underscoring the environmental benefits of this innovative approach.
The research employed a comprehensive methodology that combined in situ and laboratory tests, alongside sophisticated 2D and 3D numerical simulations. These simulations provided critical insights into the elastic modulus of ACBFS, determined to be 400 MPa, and identified that factors such as confining pressure and aging period play a significant role in the material’s stiffness. “This means that not only is ACBFS effective, but it can also be tailored to meet specific operational requirements,” Hsiung added.
One of the standout findings of the study is the recommendation for a 30-cm layer of ACBFS as a subgrade material, which aligns with the operational demands of tram systems. The comparative analysis with other ground improvement materials further solidifies ACBFS’s position as a leading choice for sustainable construction practices. By utilizing ACBFS, construction projects can not only reduce their carbon footprint but also enhance the durability and performance of tram systems.
The implications of this research extend beyond environmental concerns; they open up new avenues for cost-effective construction solutions. As cities increasingly seek sustainable infrastructure alternatives, the adoption of ACBFS could lead to significant savings in both material costs and project timelines.
With the construction sector under pressure to innovate, Hsiung’s research paves the way for a new standard in tramway engineering that prioritizes sustainability without compromising on performance. As the industry looks to the future, the integration of materials like ACBFS may very well redefine the landscape of railway and tram construction.
For more information on this innovative research, visit National Chung-Hsing University.