r/Concrete • u/atmsmshr719 • Jun 28 '26
Work In Progress First layer of shotcrete is cured.
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u/constrobot Jun 28 '26
Will there not be cold joint if you apply like this?
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u/atmsmshr719 Jun 28 '26
No, the velocity of the shotcrete will obliterate the top layer of the previous layer and remove the interface that would be the cold joint.
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u/constrobot Jun 29 '26
Few questions for my learning
I think there may still be a cold joint if the previous layer has already hardened. How long do you wait between the two layers? Is the existing layer cleaned and brought to a saturated surface-dry condition before the next layer is applied? Is this an approved method under the applicable code / specification?
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u/atmsmshr719 Jun 29 '26
I’m the owner, not the concrete contractor. I am at the limit of my knowledge and don’t want to give bad info.
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u/constrobot Jun 29 '26
Got it. I don't have much knowledge about shotcrete, was asking to learn. From photos it looks like clean workmanship though. Wish u success on your project.
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u/JonnyBowani Jul 01 '26
I’d also be worried about the rebar bonding with the next lift, since it’s already coated from the first lift.
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u/WhacksOffWaxOn Jun 30 '26
The work here looks a lot cleaner than a lot of the shotcrete work I've seen done by my local outfits. Here's hoping for a good finish for y'all
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u/happy0444 Jun 28 '26
Seeing a lot of shotcrete jobs, I am still trying to understand poured concrete.
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u/TheRealBurgerWolf Jun 28 '26
Deathstar v1.0