ACCIONA has developed a prototype pavement made up of 14 precast slabs produced with a novel cement-free concrete. The solution replaces clinker with industrial by-products used as a binder, marking a decisive step toward lower-footprint infrastructure.

The pilot pavement has been installed on the access road to ACCIONA’s Equipment Park in Noblejas (Toledo), covering 108 m². The site will serve as a full-scale demonstrator to evaluate performance under demanding environmental conditions and heavy-vehicle traffic.

To produce this geopolymer concrete, ACCIONA used industrial by-products including fly ash supplied by Tudela Veguín from the Aboño thermal power plant (Asturias), and steel slag derived from blast-furnace steel production, provided by CEMCO Cement Trading. These sustainable materials undergo a chemical activation process made possible through a strategic collaboration with MC Bauchemie Spain, which supplied the chemical activator and provided technical support to develop and fine-tune the new concrete.

By eliminating clinker, the concrete delivers a 76% reduction in CO_₂ emissions compared with a conventional reference cement (CEM I). Beyond its lower environmental impact, the modular precast design streamlines manufacturing, on-site installation, and maintenance, and also supports reuse and recycling at end of life.

ACCIONA is participating in the European innovation project LIAISON, which aims to design and validate sustainable solutions for the development of low-carbon transportation infrastructure.