NeoCem

NeoCem is a French-based startup that is reinventing cement production by replacing conventional raw materials with up-cycled clays and dramatically cutting the carbon footprint of one of the most polluting sectors in the world. Founded in 2021 and headquartered in Hallennes-lez-Haubourdin, the company has developed a proprietary process of flash calcination of excavated or recycled clays, heating them rapidly to make them reactive and then blending them into binders that can serve in place of traditional Portland cement. The approach simultaneously avoids new quarrying, reduces energy-intensive processing temperatures and time, and diverts large volumes of construction or demolition waste into valuable building material. For example, NeoCem’s first industrial site, under construction in Saint-Maximin (Oise, France), is expected to produce a binder derived from flash-calcinated clay with CO₂ emissions per ton of binder as low as about 95 kg, compared to many hundreds of kg in standard cement manufacture. Strategic partnerships with the Grand Paris Express project and support from French innovation and industrial-transition funding mechanisms underpin the firm’s rapid scaling ambitions. With the construction industry under growing pressure to decarbonise, NeoCem presents a replicable model that combines circular economy principles with industrial manufacturing. Its business model sees it supplying large-scale construction materials firms and concrete producers, positioning itself in the B2B segment of the building-products industry. While the technology is hardware- and process-intensive rather than software-driven, it nonetheless qualifies as a deep-tech innovation in the materials and heavy-industry domain. As the company expands its production capacity and seeks to deploy further sites across Europe, it aims to transform how the world builds with major implications for sustainability, infrastructure and manufacturing. Keywords: low-carbon cement, flash calcination, recycled clay binder, circular economy, industrial manufacturing, decarbonised construction materials.