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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)


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  • (Score: 0, Informative) by Anonymous Coward on Tuesday June 08 2021, @10:26AM (15 children)

    by Anonymous Coward on Tuesday June 08 2021, @10:26AM (#1143084)

    The EPA has a web page listing sources of greenhouse gases (https://www.epa.gov/ghgemissions/sources-greenhouse-gas-emissions). Have a look and total up the six categories: transportation 29%, electricity production 25%, industry 23%, commercia/residential 13%, agriculture 10% and land use/forestry 12%. According to my calculator, that adds up to 112%. Conclusion: these twisted AGW fucks are so intent on their agenda to bring us back to the stone age that they ignore basic math.

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  • (Score: 0) by Anonymous Coward on Tuesday June 08 2021, @10:38AM (5 children)

    by Anonymous Coward on Tuesday June 08 2021, @10:38AM (#1143086)

    >> they ignore basic math.

    Saint Greta must have skipped that lecture.

    Queue the downmods and defensive comments from the Greta fan club in 4..3..2..

    • (Score: 2, Insightful) by Anonymous Coward on Tuesday June 08 2021, @01:37PM (4 children)

      by Anonymous Coward on Tuesday June 08 2021, @01:37PM (#1143115)

      I find your obsession with an autistic teenage girl simply trying (albeit naively) to make the world a better place quite telling.

      In my experience, it's the sign of someone who's very insecure about his own masculinity.

      • (Score: -1, Flamebait) by Anonymous Coward on Tuesday June 08 2021, @01:50PM

        by Anonymous Coward on Tuesday June 08 2021, @01:50PM (#1143119)

        Criticism proof patron saint of environmentalism. Same principle behind child suicide bombers.

        You also assume the AC's gender.

      • (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 [newsweek.com]. 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.

  • (Score: 0) by Anonymous Coward on Tuesday June 08 2021, @11:42AM (2 children)

    by Anonymous Coward on Tuesday June 08 2021, @11:42AM (#1143096)

    Except that according to your own link this isn't even true and you're a morally corrupt lying piece of shit, like all the fucking climate deniers I've ever seen.

    • (Score: 0) by Anonymous Coward on Tuesday June 08 2021, @12:30PM (1 child)

      by Anonymous Coward on Tuesday June 08 2021, @12:30PM (#1143103)

      Your reading skills reflect your ignorance. Forget the pretty chart and read the text on that page. Add up the numbers, if the math isn't too hard for you.

      • (Score: 0) by Anonymous Coward on Tuesday June 08 2021, @12:41PM

        by Anonymous Coward on Tuesday June 08 2021, @12:41PM (#1143106)

        You're wasting your time arguing with a brainwashed millennial.

  • (Score: 2) by HiThere on Tuesday June 08 2021, @01:18PM (4 children)

    by HiThere (866) Subscriber Badge on Tuesday June 08 2021, @01:18PM (#1143110) Journal

    How about assuming that some sources fall into more than one category?

    --
    Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.
    • (Score: 0) by Anonymous Coward on Tuesday June 08 2021, @01:33PM

      by Anonymous Coward on Tuesday June 08 2021, @01:33PM (#1143113)

      Don't make the same mistake I did and try to wresle with a pig. You both get dirty, and the pig likes it.

      The fact that some sources falls in more than one category is so obvious only a climate-denying retard wouldn't think of it. That tells you all you need to know about those shallow-end-of-the-gene-pool losers.

    • (Score: 0) by Anonymous Coward on Tuesday June 08 2021, @03:55PM (1 child)

      by Anonymous Coward on Tuesday June 08 2021, @03:55PM (#1143172)

      Brought to you by the same people that use posters like this one:
      https://cdni.rt.com/files/2021.05/article/60b168e785f540785375f73b.png [rt.com]

      It would be clever, if dishonest, if they had added a 0 after the 14 cents to make it seem like $300k was $300M, but that isn't what happened, that 140 at the end is actually a footnote reference from the original source.

      So, my question is, how much money did he spend to rail against 4 people's salary for a year and make it seem like that was too much to spend on science.

    • (Score: 1) by khallow on Tuesday June 08 2021, @04:27PM

      by khallow (3766) Subscriber Badge on Tuesday June 08 2021, @04:27PM (#1143186) Journal
      See here [soylentnews.org] for how the math was cooked. Bottom line is that land use/forestry wasn't part of the list and is negative.
  • (Score: 1) by khallow on Tuesday June 08 2021, @04:25PM

    by khallow (3766) Subscriber Badge on Tuesday June 08 2021, @04:25PM (#1143184) Journal

    Have a look and total up the six categories: transportation 29%, electricity production 25%, industry 23%, commercia/residential 13%, agriculture 10% and land use/forestry 12%.

    From the link:

    Land Use, Land-Use Change, and Forestry in the United States is a net sink and removes approximately 12 percent of these greenhouse gas emissions, this net sink is not shown in the above diagram.

    So if you add the first five categories, they total 100% (up to round off error) as one would expect. If we were to include the land use/forestry category, then the first five would actually total roughly 114% with 12% of that 114% taken off by land use to get 100%.

    Moral of this post: if you're going to complain about funny math, make sure your math isn't funnier.