Tosyalı’s Slag‑Based Asphalt Redefines Kocaeli’s Steep Ramps

Tosyalı Harsco turned steel plant slag into 2026-year‑old SteelSurf pavement for Kocaeli Metropolitan Municipality’s Santral Ramp, setting a new benchmark for sustainable urban road construction in Turkey’s most challenging arterial.

Kocaeli’s Pinnacle Asphalt Transformation

■The high‑performance modified asphalt resists deformation 30 % better under heavy‑truck traffic and a 12 % gradient.

■Natural aggregate consumption drops by 40 %, curbing domestic material demand and import dependence.

■The project was completed in three months, projecting an annual maintenance cost reduction of 15 %.

Tosyalı Harsco’s Circular Technology

■Leveraging the UK‑based Steelphalt partnership, slag recycling reaches an 85 % recovery rate.

■The Bloodhound software trims metallic iron content to 0.5 %, lowering water permeability to 0.12 mm/h.

■The newly produced pavement promises a service life of 10‑15 years, double the durability of conventional mixes.

Economic and Environmental Multipliers

■The initiative is expected to ease Kocaeli’s yearly road‑maintenance budget by 30 million TRY.

■Increased slag utilization boosts steel‑sector waste‑processing capacity by 20 %, generating new jobs.

■Environmental impact assessments estimate a 1,200‑ton CO₂ emissions cut.

Markets recognize that circular infrastructure projects deliver both cost efficiency and sustainable growth. Tosyalı’s move not only lifts domestic industrial value‑add but also yields long‑term fiscal savings, strengthening budget balances and investor confidence. Aligned with government green‑transition policies, this model can be replicated nationwide, spearheading a broad‑scale infrastructure overhaul.