Then, we had our coldest winter in several years with plenty of freeze-thaw cycles. Prodigious amounts of salt were used to control ice. All of the concrete became heavily degraded. The area around the front door and steps to the basement, became so soft that I could pick pieces out with my fingernails. Further from the door, pockmarks developed. In the worst areas, it seems to have been turned into gravel to a depth of 2 inches. It really should have been replaced , but the owner cannot currently bear that expense. Instead, it has been repaired at the cost of $475. It is not as good now, as it would have been if it were sealed immediately after cleaning. My best guess is that they will need to spend more money on it, and that the worst areas will completely fail within five years.
These pictures show it finished with topping compound. I will put a water sealing coat on it later today. The areas most prone to failure now, are the edges of concrete steps leading to the basement and to a patio area. They were square edged, but are now heavily rounded, as foot traffic has worn them in the past few months. More photos to follow tonight or tomorrow morning.
I think the ground was not properly compacted before the builders poured the walkway and so this was caused by natural settling of the ground. The cement itself is in fairly good shape, only cracked where there was no support below it as it sank. Could topping compounds like this be used to build up the walkway level to make that step down a more predictable height?
Polymer based,makes the new stuff stick to the old stuff and end product is tough as nails. Our concrete back stairs were in really bad shape. The repair has lasted ten years with no sign of deterioration even with the beating they take. Oh the product I used was " painted" on the old surface before the new material was applied as a " primer" it think it is about $17 a gallon and worth ever penny. Wish I had taken before and after photos. Larry. Ps Home Depot carries it
Rebecca Norman wrote:Larry, what's that product called? It sounds incredibly useful, and if you could give a generic name maybe I could find something similar here in India. We've got a lot of shabby bits in our school that need repair. Not so much concrete, but certainly some.
Give me till tommarrow and I'll get you the name. Best thing since sliced bread. Well in the concrete and mortar world