How Biochar is Helping Us Build More Sustainably
Imagine a material that could transform one of the most common building materials, concrete, into something that actively helps fight climate change. At Lafarge Canada, we’re working on making that vision a reality through our ongoing research into biochar.
What is Biochar and Why is it a Game Changer?
Biochar is a form of charcoal produced from biomass in a low-oxygen process called pyrolysis. This process allows biochar to store carbon, preventing waste that would otherwise decompose and release carbon back into the atmosphere. At Lafarge Canada’s Innovation Hub lab, we’ve been exploring the use of biochar derived from agricultural, forestry and industrial byproducts as a replacement for sand in concrete mixes. This approach helps reduce the carbon footprint of concrete while also replacing natural resources like sand.
Testing for Real-World Applications
But before we get ahead of ourselves, there’s a lot of research to be done. Concrete is a complex material that needs to meet very high standards for strength, durability, and performance. That’s why our team has been conducting rigorous lab tests to figure out exactly how biochar affects these critical qualities.
From Lab to Life at the Mateo Meadows Project
One of the most exciting parts of this research is seeing how biochar-enhanced concrete performs outside the lab. Recently, we partnered with Habitat for Humanity on the Mateo Meadows project in Everson, Washington, to put this innovative material to the test. Mateo Meadows is a mixed-use, mixed-income housing development designed to provide affordable and energy-efficient homes for families. Designed to serve those earning between 30%-120% of the Area Median Income, Mateo Meadows will be made up of 30 permanently affordable townhomes, 14 apartments, and 7,000 sq.ft. of retail space. It’s the perfect project to demonstrate how sustainable materials like biochar can make a real difference in people’s lives.
For the first phase of construction, we delivered a mix that included 50 percent slag, 50 percent cement, and 25 pounds of Solid Carbon per cubic yard. The results so far are promising for concrete performance and achieving a reduction in Global Warming Potential (GWP) with a rating of 152, compared to the national average of 262 for similar concrete mixes. This means it’s not just good for the planet; it’s also a high-performing material that can meet the demands of modern construction.
The Future of Biochar in Construction
What’s next for biochar? While the Mateo Meadows project is a major milestone, it’s just the beginning. We’re continuing to refine our formulas and expand testing to see how biochar can be used in different types of construction. From sidewalks to skyscrapers, the possibilities are enormous.
At Lafarge Canada, innovation and sustainability go hand in hand. That’s why we’re investing in research and partnerships to create materials that not only perform well but also help solve some of the biggest challenges facing our planet.
As we continue this work, we’re excited to share our progress and learnings with you. Biochar is more than just a material; it’s a glimpse into the future of construction, where every building we create can also be a step toward a healthier planet.
