DailyDirt: Long-Lasting Concrete Ideas

from the urls-we-dig-up dept

Every year, people pour billions of tons of concrete to build the stuff we live in and drive on. Concrete is everywhere, so it'd be nice to find better ways to make it and to make it more durable and to last longer. (FYI: Concrete is usually made up of 10-15% cement, and the cement is used to bind together sand and/or crushed rocks in concrete.) Here are just a few links on making better concrete. If you'd like to read more awesome and interesting stuff, check out this unrelated (but not entirely random!) Techdirt post via StumbleUpon.
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Filed Under: cement, concrete, materials, portland cement, roman concrete, secc, self-healing, superhydrophobic engineered cementitious composite


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  1. icon
    art guerrilla (profile), 17 Jul 2014 @ 5:25am

    Re:

    w-e-l-l, the actual chemical process (called hydration), theoretically goes on forever (albeit in an asymptotic curve), as long as it has some water to do the reaction...
    but what you say is true: depending on the environment, concrete can be strengthened by proper 'curing' (so to speak), as far as keeping it moist over the first week or so...
    the other major problem, is that ignorant mud pushers mix in *way* too much water because it makes it easier to "pour" (concrete should always be "placed", not "poured", says my old concrete structures prof) and slop around the concrete, but causes weaker concrete in several ways: tends to segregate the aggregate, and makes the cement itself weaker...
    been all kinds of admixtures for a long time for specialized mixes: retardants to slow the reaction, accelerants (stop flagging real words, you useless spel czech) for quick-setting, fiberglass threads for strength and to increase its resistance to cracking, etc...
    oh, concrete WILL crack, just a matter of controlling it where you want it to crack...

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