Wanted to share some exciting news that came from a workshop between Adrian Smith + Gordon Gill Architecture, Ozinga, LafargeHolcim in the US , Carbon8 Systems, National Ready Mixed Concrete Association And Athena Sustainable Materials Institute to review how to get across the finish line with our Low Zero Negative Carbon Concrete study. The challenge we set ourselves was to develop a >6000PSI concrete with an early strength that is high enough to allow post-tensioning in 24-48 hrs. Long story short - through a combination of Carbon8 Systems' carbon negative aggregate (manufactured through a low energy process that combines two waste streams; residue ash and exhaust CO2), Ozinga’s mix-design technology and low and zero carbon off-the-shelf cementitious material we have produced a concrete mix – currently being tested , that has a predicted GWP of -9 kgCO2/yd3 (yes, that's negative nine). While we don’t expect this mix to meet the early strength requirements, it could well be suitable for foundation or composite slabs – we shall see in a few weeks. We are hoping that a compliant mix design will have a GWP that is somewhere between -10 kgCO2/yd3 and +10kgCO2/yd3 😊. This means that, if testing goes according to plan, we have a workable, readily usable, super low carbon concrete mix that could potentially be sequestering more CO2 during manufacture than is emitted, that will be backed up with a 3rd party EPD as proof. We have yet to consider the CO2 that the concrete sequesters over its lifetime and the potential energy savings from the high SRI (notice how white it is) and thermal mass activation. Concrete is THE most used material on earth after water and now we have a roadmap to get it to zero carbon. Ryan Cialdella, LEED AP Lionel Lemay Paula Carey Michael LeMonds Daniel Ptacek, FCIOB Xi Yi Bob Forest Anthony Viola Gordon Gill Will report back as testing is completed, so watch this space. #embodiedcarbon #globalwarming #climatechange #concrete #concreteconstruction #gamechanger #architecture #innovation
Wow, Christopher Drew, PhD, amazing. A new concrete mix with a negative Global Warming Potential (GWP). A key step forward to genuine sustainability. Well done. Looking forward to reviewing a presentation or a published paper.
WOW! Fantastic work, Chris and team. This is so exciting. Do continue to share!!
Fantastic work Christopher Drew, PhD
Exciting and encouraging results Christopher Drew, PhD. Well done to you and the team that have been working on this!
Please let us at Building Transparency know as soon as this is a reality so we can get that EPD into EC3!
The focus on sustainability could not be more important right now and we are proud to be a part of the innovation. You are doing amazing work👏🏼
Best of luck with the final development, this is a much needed innovation in a key material.
Very promising indeed! How widely available are the core ingredients for this concrete? In other words, is this scalable enough to replace a significant portion of "traditional" concrete?
Great news. I remember Carbon8 when it was being investigated as a film for sequestration of flue gas materials in electric generation so good to see it’s still a potential Have concrete this low in embodies carbon would be amazing if it can be reliably produced at a similar cost
Innovation Lead at dbHMS
2yHi Christopher, very exciting! Is this for A1-A3? Up until this point, we've been looking at a "good" low-carbon mix being in the ~300ish kgCO2e/cy range, right? So we are looking at about 30x less potentially? HUGE improvement!!