Introduction of Steel Slag in Road Pavement Construction
POSCO Gwangyang Steelworks has attracted attention with its innovative use of steelmaking slag, a by-product of the steel production process, in road pavement construction. On the 14th of February, the steelworks successfully integrated steel slag as an asphalt aggregate for road paving within the steel mill premises. Steel slag, produced when impurities are removed from molten metal during steelmaking, has traditionally seen limited application in construction and road infrastructure. However, its growing use as an aggregate for asphalt concrete (ascon) has sparked considerable interest due to its excellent durability, high density, and superior resistance to deformation.
Enhanced Durability and Environmental Benefits
Compared to conventional asphalt mixtures that typically use sand and gravel as aggregates, roads made with slag are expected to have a longer lifespan. POSCO claims that using steel slag not only boosts the durability of road surfaces but also offers environmental benefits, including a reduction in fine dust and vehicle noise. This is in line with global trends that emphasize sustainable, eco-friendly materials for infrastructure projects.
POSCO’s Initial Success with Steel Slag in National Route 3
POSCO has been progressively introducing steel slag in the construction sector, starting in June of the previous year when it provided slag for asphalt production to companies in the industry. One of the notable applications was in the Chungju section of National Route 3, marking the first large-scale implementation of the slag-based asphalt. The steelworks is now focusing on comparing the performance of roads constructed with slag to those made with traditional materials, with plans to expand its use based on the positive results.
Sustainable Resource Recycling and Industry Attention
The initiative supports resource recycling by repurposing steel by-products that would otherwise go to waste. This alignment with sustainable construction practices has gained significant attention within the construction industry, and POSCO is committed to further research in developing eco-friendly materials for infrastructure.
Future Outlook for Eco-Friendly Construction Materials
With its innovative approach, POSCO aims to pave the way for a greener, more sustainable future in construction while enhancing the performance of critical infrastructure. The company plans to continue research and development to expand the scope of slag use and explore new eco-friendly solutions for the construction industry.
