Submitted by PoorIsTheNewSwag t3_1262kes in science
Comments
AllanfromWales1 t1_je7b3mo wrote
If you pre-carbonate the concrete you are not going to have the alkaline environment which prevents the corrosion of the steel reinforcement in the concrete. That will necessarily lead to expansive corrosion and spalling of the concrete. An approach like this might be effective for mass concrete, with no reinforcement, but that's a very small part of the concrete market.
NevyTheChemist t1_jeaadnj wrote
They talk about that in the article. Apparently their methods solves this.
AllanfromWales1 t1_jeajk7l wrote
Nothing that I read offered a solution. They implied that pre-carbonating gets over the problem of cracking of the concrete as it carbonates, but that isn't a serious issue. Corrosion of reinforcing steel can and does occur in uncracked concrete if the pH is not kept alkaline. The permeability of the concrete to air is ample to allow this. Subsequently cracking occurs because the corrosion products have a higher volume than the steel they replace. The cracking is a result of the corrosion, not the cause of it.
Aromatic_Accident_77 t1_je7inrb wrote
Would gfrc work with this?
[deleted] t1_je7zroc wrote
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AllanfromWales1 t1_je8r3zm wrote
No reason why not, but it tends to be an expensive alternative.
Aromatic_Accident_77 t1_je8s5u9 wrote
Fair! I only know of gfrc. No clue what the economics of the varying approaches are.
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[deleted] t1_jed5zxz wrote
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kenlasalle t1_je79y29 wrote
Here's hoping we don't later learn that the additive is toxic to all life or something.
It seems the seeds of our demise often come in the form of our rescue.
NevyTheChemist t1_jeaaavq wrote
It's baking soda.
iamJAKYL t1_je78q9a wrote
This is already being done, the issue is, it's a choice. It needs to be policy.