en.Wedoany.com Reported - A research team at the Massachusetts Institute of Technology has, for the first time, directly observed the transient chemical reaction sequence triggered by injecting carbon dioxide into cement paste using real-time Raman spectroscopy, which may explain why cement paste injected with carbon dioxide gains strength more rapidly.

In September, at MIT's Pierce Laboratory, researchers depressurized liquid carbon dioxide, causing it to instantly freeze and form solid flakes. These flakes were mixed into fresh cement paste and pressed into disks about the size of a dime, with a thin layer of vegetable oil applied to the surface to prevent water evaporation and air ingress.

The team used a laser to irradiate the samples, capturing for the first time in real time the transient intermediate products that appear during the injection of carbon dioxide into cement paste. Injecting carbon dioxide into cement-based materials is a carbon sequestration strategy that can reduce greenhouse gas emissions. Although some companies have commercially promoted concrete injected with carbon dioxide, the underlying chemical mechanisms had not previously been directly visualized.

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