In Search Of Cement Replacements

 
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Old 10-21-2017, 12:27 PM   #1
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In Search Of Cement Replacements


"Could we replace cement as the vital element in concrete some day? We look at two alternative answers to this question."





https://aec-business.com/search-ceme...4d026ba2b58612
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Old 10-21-2017, 12:42 PM   #2
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Re: In Search Of Cement Replacements


Gonna be a long time before that happens I bet.

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Old 10-21-2017, 02:46 PM   #3
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Re: In Search Of Cement Replacements


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Gonna be a long time before that happens I bet.
That's what the calportland guy said in the video. The China statistic was a little hard to believe.
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Old 10-21-2017, 03:05 PM   #4
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Re: In Search Of Cement Replacements


We have a local redi-mix company that supposedly doesn't use cement. I asked them once if I could get a 6 bag mix and they replied that they don't do bag mixes, only PSI. Maybe they don't totally eliminate cement, but I think that they try hard to. The finishers' aren't as fond of their concrete because it has so little cream. The footer and wall guys just want it as cheap as they can get it.
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Old 10-21-2017, 03:08 PM   #5
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Re: In Search Of Cement Replacements


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We have a local redi-mix company that supposedly doesn't use cement. I asked them once if I could get a 6 bag mix and they replied that they don't do bag mixes, only PSI. Maybe they don't totally eliminate cement, but I think that they try hard to. The finishers' aren't as fond of their concrete because it has so little cream. The footer and wall guys just want it as cheap as they can get it.
They substitute one bag of Portland cement for fly ash or another product (can't recall name). My flat work guy prefers it. I'll dig out a receipt and see what it's called if someone doesn't chime in first.
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Old 10-21-2017, 03:15 PM   #6
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Re: In Search Of Cement Replacements


I hear the word "slag" used a lot. Fly ash is familiar too.
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Old 10-21-2017, 03:28 PM   #7
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Re: In Search Of Cement Replacements


The Finnish concept apparently is for smaller precast, factory produced concrete elements that are common in Europe. - Not ready-mix concrete.

Factory produced concrete has the advantage of doing superior curing under tightly controlled exotic conditions. The used some superior curing in out concrete block plant in the U.S. and made 10,000 psi block with only 5 hours of curing (They had virtually no shrinkage compared to normal curing).

The "revolutionary" concrete still has to undergo many years of testing to prove the durability - real life and not lab accelerated unproven tests.
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Old 10-21-2017, 04:14 PM   #8
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Re: In Search Of Cement Replacements


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I hear the word "slag" used a lot. Fly ash is familiar too.
The receipt lists Artevia mix. Not sure what the additive is but my flatty says its designed for stamped concrete but gives a smoother finish on regular work and is easier to work with. I don't know, maybe it's just what he's used to using. He does REALLY good work so I won't question it. Here's the RM's website.

Anyway it all still has mostly Portland cement as its binder.


http://www.consumersconcrete.com/artevia_polished.html
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Old 10-21-2017, 04:41 PM   #9
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Re: In Search Of Cement Replacements


Iron carbonate? I'm all for it - how muck does a block weigh, and how do I get the rust stains off it?.....
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Old 10-21-2017, 06:14 PM   #10
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Re: In Search Of Cement Replacements


Maybe take some clues from what the Romans used, volcanic ash (pozzolana) and lime, use that as a starting point and go from there
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Old 10-21-2017, 06:28 PM   #11
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Re: In Search Of Cement Replacements


Looks like we'll need more volcanos.
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Old 10-21-2017, 06:30 PM   #12
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Re: In Search Of Cement Replacements


What ever happened to geopolymers - some kind of stone dissolved in an acid, then mixed with stone dust to form a solid rock?
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Old 10-21-2017, 06:53 PM   #13
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Re: In Search Of Cement Replacements


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Looks like we'll need more volcanos.
be careful what you wish for...

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Old 10-21-2017, 06:59 PM   #14
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Re: In Search Of Cement Replacements


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They substitute one bag of Portland cement for fly ash or another product (can't recall name). My flat work guy prefers it. I'll dig out a receipt and see what it's called if someone doesn't chime in first.


It probably is a pozzolan,and more than likely a metakaolin .
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Old 10-21-2017, 11:27 PM   #15
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Re: In Search Of Cement Replacements


I've always been concerned about heavy metal and other contaminants in fly ash being released in concrete made with it, say when it's being ground on or pulverized in some manner but apparently that might be a misguided worry as the article excerpt below mentions.

In fact, when concrete is produced, “much of the fly ash reacts with the Portland cement products of combustion to become, get this—calcium silicate hydrate—the same mineral that gives concrete its strength,” explains Michael Chusid, RA, FCSI, CCS, principal of the Tarzana, Calif.-based architectural technology consulting firm, Chusid Associates. “Any trace amount of heavy metal gets entrapped in the hydrated cement crystals and will have a very difficult time becoming liberated.”
Filling in more details on this unique chemical reaction, David Shepherd, AIA, LEED AP, sustainable development director, Portland Cement Association, Skokie, Ill., explains, “unlike some encapsulation techniques which coat a contaminant with material to ‘glue’ it into place, fly ash chemically reacts with cement during the hydration process and becomes an integral part of the new crystalline structure.”
Consequently, many independent building professionals, and even some environmental groups, are on board with the EPA’s current position that the encapsulated use of fly ash is a very good alternative to sending the ash to the landfills where it faces a greater risk of environmental catastrophe such as the collapse of a Tennessee Valley Authority’s fly ash containment structure in 2008, which sent 5.4 million cubit yards of toxic sludge across 300 acres in Kingston, Tenn.
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Old 10-26-2017, 04:46 AM   #16
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Re: In Search Of Cement Replacements


STG: The hazard of metals in Fly ashes are in general very low, fly ash being the noncombustible remainder of coal, which of course is mostly fossil plant residual, How could plants have that much poisonous metals in them?

And the biggest reason for the lack of heavy metals in fly ash, is they would be extracted if present in any great amount.

But of course fly ash is mildly radioactive as all large coal plants produce much more fall Out radiation then normally operating US Nuke plants....

As the science of Portland Cements improves, they will shrink less, and have greater tensile strength to compression strength ratios, and reinforcement materials and concrete will have closer elasticity properties allowing designers to design lighter < cheaper structural elements.
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Old 10-26-2017, 02:38 PM   #17
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Re: In Search Of Cement Replacements


Rice husk ash.

http://www.sciencedirect.com/science...14509516300924


Renewable. Not radioactive.

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