Cleaner clinker shows the way to green concrete

Makers say it's a critical step to producing cleaner building materials.

Holcim’s Altkirch plant in France, where the first clinker made entirely of recycled minerals has been created. Photo: Holcim.

Swiss multinational Holcim (OTC: HCMLY) has produced the world’s first clinker made entirely of recycled minerals at its Altkirch plant in France. That’s clinker, not clunker.

Clinker is the intermediary product between limestone …