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

    by HiThere (866) 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.
    Starting Score:    1  point
    Karma-Bonus Modifier   +1  

    Total Score:   2  
  • (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: []

    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 [] for how the math was cooked. Bottom line is that land use/forestry wasn't part of the list and is negative.