A shot of carbon dioxide rewires how cement sets

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🗞️ Driving the news: Researchers at MIT have visualized for the first time the chemical sequence in CO₂-injected cement paste, revealing how carbon dioxide temporarily rewires the cement-setting process
• Using real-time Raman spectroscopy, they captured a transient silica-gel intermediate that guides calcium silicate hydrate (C-S-H) formation, explaining why CO₂-injected concrete gains strength faster and permanently stores carbon.

🔭 The context: CO₂ injection into cement paste has been commercially used to store carbon and accelerate curing, but the underlying reactions were previously too fast to observe
• The MIT team tracked the process over 24 hours, showing three stages: calcium capture, a transient silica-gel network, and a rewired binder microstructure that distributes C-S-H evenly across the matrix, boosting early compressive strength

🌍 Why it matters for the planet: Cement production accounts for about 8% of global CO₂ emissions
• By integrating CO₂ into the cement matrix, this method both reduces atmospheric carbon and produces stronger concrete at early ages
• If optimized at scale, CO₂-injected cement could offset a significant portion of global cement emissions, contributing to decarbonizing the built environment

⏭️ What’s next: Researchers aim to quantify the mechanical properties of the silica-gel-derived binder and refine CO₂ dosing to maximize carbon storage without compromising cement hydration
• Future work could inform industrial-scale CO₂ injection strategies and cement formulations

💬 One quote: “We’ve used Raman spectroscopy to visualize things that haven’t been seen before — the fleeting silica gel is the key to understanding CO₂-injected cement’s enhanced performance.” – Admir Masic, MIT Concrete Sustainability Hub

📈 One stat: Cement paste injected with 1% CO₂ by weight achieved 13% higher compressive strength at 24 hours compared to reference mixes

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