The sustainability of human activity has become a key issue in
the last decade of the 20th century and the first decade of the 21st
century. The search for sustainability has driven the reuse of suitable
industrial by-products with the right properties, thereby
reducing the consumption of natural resources. Since the pioneering
papers of Motz, Geiseler and Koros [1–3], almost all kinds of
iron and steelmaking (as well as other metal) slags have been proposed
for use in construction and civil engineering. Researchers
now face the task of finding the most efficient and appropriate