What to do with a cracked concrete patio?
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How can I salvage a crumbling, cracked 24x24" triangle shaped concrete patio without tearing it out?
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When we inherited a cracked patio with a home we resurfaced the whole patio with more concrete and smoothed it over to be level. The wet concrete filled in the crack and slight indentation and you could not tell it came with this problem at all. Maybe you could just resurface yours?
Consider resurfacing it with a new layer about 2 inches deep, but first using a bonding solution before you pour the new onto the old. You may have to frame the outside until it sets.
You can patch it if the source of the cracking has been resolved. Sika makes a product that will work.
You may have to shore up or completely replace if the problem is still there. If you add additional ready mix to the existing concrete you will need to score it so that it will adhere.
New concrete will not adhere to old. You can resurface with a concrete resurfacing product.
https://www.thespruce.com/how-to-resurface-concrete-patios-2132239
https://www.thisoldhouse.com/how-to/how-to-resurface-worn-concrete
https://www.youtube.com/watch?v=lkl3bY7Z88k