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ASR
- Thread starter dik
- Start date
like rust on rebar it expands causing cracks that leads to delamination that further exposes the interior of the concrete which will break down further until nothing solid is left. So in away it’s likely worse than rust since it is throughout the concrete. Id say it’s concerning, quantify it likely difficult.
HTURKAK
Structural
- Jul 22, 2017
- 3,371
ASR causes internal pressure and results random cracking patterns called “map cracking” . In long term , cracks allow water to penetrate the concrete, accelerating the corrosion of reinforcing steel and further degrading the structure.
But you can manage the ASR with painting the concrete surfaces to minimize the moisture .
But you can manage the ASR with painting the concrete surfaces to minimize the moisture .
Alkali-Silica Reaction? It would have the potential to penetrate and if it's on the top surface, likely the whole batch has the problem, so it would progress.
Isn't that moisture driven? I'd have a tough time convincing myself that moisture could somehow be precluded on a foundation, because the water won't necessarily be coming from above and it's tough to paint the bottom side of a footing or a pile cap.
The people who really seem to know about this is the Las Vegas Building department. Or maybe that's sulfate soils.
"cover" is generally predicated for a fifty year life, then the carbonation reaches the rebar and the neutralized concrete doesn't protect it. There have been protruding roof elements that "died" from rain exposure, with possible oxide jacking forces from rebar expansion contributing.... (this is a bit of an esoteric topic and is mostly recognized in nuclear facility designs, for whatever reason). Wikipedia kind of misses the Nuclear research, but it's got some leads for scholarly research if you are interested. https://en.wikipedia.org/wiki/Oxide_jacking
Isn't that moisture driven? I'd have a tough time convincing myself that moisture could somehow be precluded on a foundation, because the water won't necessarily be coming from above and it's tough to paint the bottom side of a footing or a pile cap.
The people who really seem to know about this is the Las Vegas Building department. Or maybe that's sulfate soils.
"cover" is generally predicated for a fifty year life, then the carbonation reaches the rebar and the neutralized concrete doesn't protect it. There have been protruding roof elements that "died" from rain exposure, with possible oxide jacking forces from rebar expansion contributing.... (this is a bit of an esoteric topic and is mostly recognized in nuclear facility designs, for whatever reason). Wikipedia kind of misses the Nuclear research, but it's got some leads for scholarly research if you are interested. https://en.wikipedia.org/wiki/Oxide_jacking
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