Slash Boxes

SoylentNews is people

posted by mrpg on Tuesday June 08 2021, @09:43AM   Printer-friendly
from the cement-cements-cembalos dept.

Visualizing cement hydration on a molecular level:

The concrete world that surrounds us owes its shape and durability to chemical reactions that start when ordinary Portland cement is mixed with water. Now, MIT scientists have demonstrated a way to watch these reactions under real-world conditions, an advance that may help researchers find ways to make concrete more sustainable.

[...] Cement in concrete contributes about 8 percent of the world's total carbon dioxide emissions, rivaling the emissions produced by most individual countries. With a better understanding of cement chemistry, scientists could potentially "alter production or change ingredients so that concrete has less of an impact on emissions, or add ingredients that are capable of actively absorbing carbon dioxide," says Admir Masic, associate professor of civil and environmental engineering.

[...] Using Raman microspectroscopy, the MIT scientists observed a sample of ordinary Portland cement placed underwater without disturbing it or artificially stopping the hydration process, mimicking the real-world conditions of concrete use. In general, one of the hydration products, called portlandite, starts as a disordered phase, percolates throughout the material, and then crystallizes, the research team concluded.

Journal Reference:
Hyun-Chae Loh, Hee-Jeong Kim, Franz-Josef Ulm, et al. Time-Space-Resolved Chemical Deconvolution of Cementitious Colloidal Systems Using Raman Spectroscopy, Langmuir (DOI: 10.1021/acs.langmuir.1c00609)

Original Submission

This discussion has been archived. No new comments can be posted.
Display Options Threshold/Breakthrough Mark All as Read Mark All as Unread
The Fine Print: The following comments are owned by whoever posted them. We are not responsible for them in any way.
  • (Score: 1) by khallow on Tuesday June 08 2021, @04:37PM (2 children)

    by khallow (3766) Subscriber Badge on Tuesday June 08 2021, @04:37PM (#1143190) Journal
    He's not the only one. For example, I recently walked through a pile of Newsweek (a US-based magazine) stories on climate change []. At the time I looked last week, 8 out of the latest 100 Newsweek stories about climate change were about Greta Thunberg (with about as much news content as this post). It appeared to me that only US presidents (out of the personalities mentioned in the titles) were getting better coverage.

    It reminds me why I stopped reading Newsweek. They dropped the "news" part of the magazine.

    Here, I don't see the point of complaining about someone's obsession with Thunberg when major news outlets are also obsessing over her.
  • (Score: 2) by DeathMonkey on Tuesday June 08 2021, @05:43PM (1 child)

    by DeathMonkey (1380) on Tuesday June 08 2021, @05:43PM (#1143218) Journal

    Wow, EIGHT whole stories!

    She's almost as newsworthy as Pizza Rat! No wonder you guys are so triggered!

    • (Score: 1) by khallow on Tuesday June 08 2021, @06:05PM

      by khallow (3766) Subscriber Badge on Tuesday June 08 2021, @06:05PM (#1143228) Journal

      She's almost as newsworthy as Pizza Rat!

      I take you missed the part where only US presidents (Biden and Trump BTW) were getting more climate change press. Pizza Rat doesn't get that kind of coverage.