Holcim, in collaboration with award-winning architect Alejandro Aravena and his firm ELEMENTAL, has introduced a pioneering biochar-based concrete mix aimed at turning buildings into long-term carbon sinks. The breakthrough technology, which debuted at the 2025 Architecture Biennale in Venice, actively captures and stores carbon from the atmosphere, marking a significant step forward in sustainable construction.
“Holcim is the leading partner for sustainable construction, and we work with stakeholders across the value chain to deliver innovative and sustainable solutions for our customers,” said Miljan Gutovic, CEO of Holcim. “Through our partnership with Alejandro Aravena and the ELEMENTAL team, we have demonstrated how Holcim’s new carbon sink technology can shape the future of construction.”
The new biochar-based concrete is featured in a full-scale prototype of a Basic Services Unit, designed by Aravena’s firm. This unit, which exemplifies the principle of incremental design, provides essential housing infrastructure that can be expanded upon by residents over time. Using precast panels, it delivers core housing functions quickly and efficiently—perfect for addressing the growing demand for affordable housing without compromising environmental integrity.
Biochar, the key component of this innovative concrete, is made by stabilizing organic material that would otherwise decompose and release CO₂. When integrated into Holcim’s low-carbon cement and concrete, biochar sequesters carbon permanently, preventing up to three kilograms of CO₂ from being released for each kilogram used.
This new material also incorporates 100% recycled aggregates, supporting Holcim’s commitment to circular construction practices. It complements the company’s existing sustainable technologies such as ECOPact, ECOPlanet, and ECOCycle®.
“Holcim’s decarbonization technology enables us to address the scale and speed of the housing crisis’ demand while minimizing environmental impact,” said Alejandro Aravena. This collaboration signals a transformative shift in the construction industry, where sustainability is now central to solving both housing shortages and climate challenges.
