Pellet Fan
All Things Considered => General Discussion--Non food Related => Topic started by: GrillinGlen on January 22, 2018, 02:43:43 PM
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this is all over my back patio, it was poured spring of 2016, so about 1.5 years (2 winters). The first winter it did a few little spots, the concrete guy patched it and said it would be fine. After the first really cold weather this year it showed up a lot. About 10x20 area effected. Dont use ice melt back there. One section of the patio is the only flat work with issues, the rest of the patio and the driveway is fine. Looking for the best way to fix it this spring and if there is a way to stop it from getting worse.
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The 1st photo looks like damage from a high pressure washer, which I am sure it is not...the 2nd one look like 50 year old concrete at my uncles old farm...And I have no way of helping you cuz I cant imagine what caused either.
Pure speculation tells me a bad mix...
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Its the same problem in both pics, if you sweep off the loose stuff thats on top of the 2nd pic and it will look just like the first.
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1-1/2 year old concrete should not be doing that. I would get my concrete man back ther and insist he replaces it. After it has cured well I would than seal it.
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1-1/2 year old concrete should not be doing that. I would get my concrete man back ther and insist he replaces it. After it has cured well I would than seal it.
I agree.
http://www.redcoidaho.com/2013/03/24/flaking-or-chipping-concrete-causes-and-solutions/
https://www.google.com/search?q=why+is+my+concrete+pitting+and+flaking&client=firefox-b-1&source=lnms&sa=X&ved=0ahUKEwjj66WmyOzYAhVV_WMKHZ8OAyoQ_AUICSgA&biw=1024&bih=628&dpr=1
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Looks like what my back patio is doing, but mine was poured in 1975...Residential concrete workers in the Boise area are notorious for adding too much water to the mix to make it easier to work. That would be my guess since the top is flaking off. Make him pull it out and re-pour it. Don't let them put down any mud with more than a 5" slump. Preferably less. It will be harder for them to work and smooth, but it wont water down the mix design and end up with bad concrete.
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Looks like it dried to fast. Was this poured in hot weather? And if so did he keep it moist? The longer it takes to dry, the stronger it will be.
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Looks like it dried to fast. Was this poured in hot weather? And if so did he keep it moist? The longer it takes to dry, the stronger it will be.
That was my thought.
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They were in a hurry to finish it. It was worked with moisture (bleedwater) still on the surface. Surface needs to evaporate off before finishing. Excess moisture rose to the surface carrying mortar with it and diluting the mixture. You end up with a mortar skim finish that chips and pits into a powder.
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I don't know spit about concrete, but...
I've never seen another layer of concrete that fixed the problem short of cutting out and replacing the affected area top to bottom.
If your contractor won't make good on the issue, I'd look at maybe some sort of epoxy product.
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it may have been a hot pour. This is when concrete has been mixed to long before being poured. There is a period of time that concrete has to be poured before it starts to harden on its own. There are other reason this could have occurred also.
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might be time to place some brick pavers over the concrete, that doesn't really look salvageable.
DK
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In my experience (35 years of architectural practice and currently the IN state building commissioner), spalling like that is usually the result of water evaporating from the finished surface before hydration is complete, weakening the finish surface of the pour. That's why its important to keep the surface damp, especially in warmer weather. Sometimes you'll see visqueen or other coverings used on slabs as they cure, to avoid this kind of thing.
If you happen to get a sizable piece of aggregate near the surface where the water has evaporated, the spalling will take the form of a deeper pit, where the aggregate piece becomes exposed and can work loose, leaving an even bigger hole. As these are exposed to freeze/thaw cycles the concrete will break up further and the damage will grow.
Patching tends to be a short-term fix. You can clean and scarify the surface and pour a new topping slab, but even that isn't a good long-term solution, especially since it would represent a pretty good percentage of the cost of a whole new slab.