How carbon removal is helping make ultra-low carbon concrete a reality

Episode 26 is with Rahul Shendure, CEO of CarbonBuilt.

There are many different storage pathways for carbon dioxide removed from the atmosphere.

One storage medium that we don't talk about enough is storage of CO2 in long-lived products like concrete. Storing CO2 in concrete not only helps solve the CO2 storage problem - especially for smaller, modular carbon removal deployments - but helps decarbonize a very carbon intense product.

My guest today, Rahul Shendure, leads a company that is developing ultra low carbon concrete that is coming off the production line today and demonstrates the exciting potential for integrating carbon removal technologies alongside other decarbonization technologies in existing industrial processes.

Rahul Shendure is a serial entrepreneur and investor focused on sustainability and health. He is the CEO of CarbonBuilt, whose technology enables the production of ultra-low carbon concrete, reducing emissions by 70-100%. He previously served as Co-Founder and CEO at Bellwether Bio, whose acquisition by Guardant Health led to the launch of the first blood-based colorectal cancer screening test. Rahul’s earlier engineering and commercial roles span a wide range of climate-related industries ranging from plastics (GE), hydrogen fuel cells (Ballard Power Systems), renewable fuels and chemicals (Amyris) and next generation renewable electricity (Oscilla Power). Rahul earned a B.S. in Chemical Engineering from MIT and received his MBA from Harvard Business School.

CarbonBuilt, winner of the NRG COSIA Carbon XPRIZE, enables concrete manufacturers to produce ultra-low carbon concrete products with 70-100% less embodied carbon. CarbonBuilt’s technology replaces most of the expensive, high-carbon Portland cement typically used during concrete manufacturing with a proprietary low-cost cement alternative made from widely-available low carbon materials. These materials harden after chemically reacting with CO_2, to not only strengthen the blocks, but also permanently store the CO₂ in solid form, diverting it from the atmosphere. Because it can be cost-effectively installed at existing concrete manufacturing plants and delivers products that meet ASTM C90 and other applicable industry standards without increasing costs, CarbonBuilt’s technology can be rapidly adopted by the nearly 800 concrete plants in the U.S. alone.

In this episode, Na’im and Rahul discuss:

• Concrete and its carbon footprint;

• CarbonBuilt’s technology for producing ultra-low carbon concrete;

• The distinction between emissions avoidance and removal both in CarbonBuilt’s technology as well as its credit system;

• CarbonBuilt’s commercial partnership with Blair Block;

• CarbonBuilt’s participation in the Four Corners Carbon Coalition’s first project;

• Barriers to scaling low carbon concrete technology and the role of policy in addressing these barriers.

Relevant Links:

• CarbonBuilt

• CarbonBuilt and Blair Block commercial partnership

• Four Corners Carbon Coalition

• CarbonBuilt and Four Corners Coalition

• Paving the Way for Low-Carbon Concrete: Recommendations for a Federal Procurement Strategy

• Concrete: Square one for scaling distributed direct air capture?

Special note:

I'm looking for someone to support the production, editing, and promotion of this podcast. I’m looking for someone who is passionate about carbon removal, who can help brainstorm guest ideas, develop thought provoking interview questions, schedule and join recordings, edit recordings, write up the show notes, and promote the episode on various channels.

It's an important job and an exciting opportunity to plug into the carbon removal field. This is a fully remote contract position starting October 1st amounting to about 8 to 10 hours of work per episode. You don't need to be an expert in podcasting. I certainly wasn't when I started. Just a lot of passion, diligence, organization, and a willingness to learn. If you're interested, send an email to naim@carboncurve.co with your resume and a letter of interest by September 15th.

This podcast is created and published by Na’im Merchant. Episode production and content support provided by Lucia Simonelli.

Na’im Merchant is the co-founder and Executive Director of Carbon Removal Canada, a policy initiative focused on scaling carbon removal in Canada. He is also a policy fellow with Elemental Excelerator. He previously ran carbon removal consulting practice Carbon Curve, and publishes The Carbon Curve newsletter and podcast. Every two weeks, Na’im will release a short interview with individuals advancing the policies, technologies, and collective action needed to scale up carbon removal around the world.

If you enjoyed this episode, please subscribe to this podcast on your favorite podcast app or subscribe via The Carbon Curve newsletter here. If you’d like to get in touch with Na’im, you can reach out via Twitter and LinkedIn.