Carbstone Pavers: A Sustainable Solution for the Urban Environment

To reduce CO2 emissions from the building industry, one option is to replace cement in specific applications with alternative binders. The Carbstone technology based on reaction of calcium- and magnesium-containing minerals form carbonate Mixes carbon steel slag stainless-steel slag, tailored particle size distributions, were compacted a vibro-press subsequently carbonated an autoclave produce pavers. materials sequester 100–150 g CO2/kg slag. Compressive tensile splitting strength resulting pavers determined, ratio was found be comparable that concrete. environmental performance pavers, average 3.6 MPa, compliance Belgian Dutch leaching limit values for construction materials. In addition, results concrete mix made aggregates crushed (simulating so-called “second life” pavers) demonstrate can recycled as cement-bound products after their product lifetime.