CO₂ Injection Accelerates Cement Strength Development Through Novel Chemical Mechanism
MIT researchers discovered that injecting carbon dioxide into cement paste accelerates its early strength gain by approximately 13% through a previously unobserved chemical reaction. The team used solid CO₂ flakes mixed into cement and laser observation to identify the transient chemical process responsible for this effect. This finding could improve concrete construction efficiency and potentially reduce the environmental impact of cement production.
Researchers at MIT's Pierce Laboratory conducted an experiment where they depressurized liquid carbon dioxide to create solid CO₂ flakes, which were then blended into cement paste and formed into small disk samples sealed with vegetable oil. Using laser observation techniques, the team tracked the chemical reactions occurring in real-time and identified a transient reaction mechanism that explains why CO₂-injected cement gains strength faster—specifically achieving approximately 13% greater early strength. This discovery reveals previously hidden chemistry in the cement setting process. The findings could have practical applications for construction by reducing curing times and potentially lowering the environmental footprint of cement manufacturing, which is a significant contributor to global carbon emissions.
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