Hi, We recently had a concrete border installed. They use one of those border machines. We had this done about three weeks ago. The other day we were working out in the yard and I dropped the wooden handle of the shovel onto the border from a distance of two feet above. It left a big 2cm deep, 1 inch wide0 or so dent in the border. We ignored it and figured it was a air pocket or some other anomaly. About an hour or so I was walking by and my foot brushed by a corner of the border and it fell apart. I got down and started rubbing it with my hand and the whole thing started to crumble apart in my hand. I went around to several other parts of the border in the back yard and I took a regular stick and using a regular stick, with surprisingly little force I made a 2 inch deep mark simply by rubbing it. The whole border is this loose where simply by brushing it with your foot it will start to crumble apart. This is 3 weeks after it was poured. I went into the front yard and it was hard as a rock. I spend several minutes hitting it in various places with a screwdriver, and I didn't so much as leave a scratch. I picked up a pebble size piece of the concrete from the front yard that was excess and it was firm as a rock, I couldn't break it apart. I went into the backyard, and picked up a similarly sized piece of extra cement and it crumbled into dust in my hand. All the borders in the backyard are that weak.
So I called the guy who came back. He said, "Well, it looks like the mix for the backyard possibly was not as good as the one for the front yard." He then changed his view around, and rather then accept responsibility he said it was our fault for disturbing it before the required 4 week curing process was over. He only replaced the corner which had fallen apart. Now, I am no expert and that is why I am referring to this forum. In my mind however 3 weeks should be enough time for a concrete border to cure, and even if it did require a full
4 weeks, shouldn't by 3 weeks into it (under the hot 112 degree Phoenix sun), it be hard enough not to crumble so easily? Our argument was, well, if the front is solid as a rock, and they were both poured on the same day, shouldn't the back be equally as strong? The guy is not a licensed contractor (we checked after these problems happened) so we can't take him to the board of contractors. He is an LLC. He refused to replace the backyard borders besides the one corner citing it wasn't his fault, it was all our fault. In my mind though, it is not our fault if he mixed it wrong.
So I wondered if anyone who knew this field of expertise could give their opinion on the matter, and possibly refer me to some concrete standards or something. What retaliation is there for something like this? Is it really our fault even though we didn't do anything to it? How strong should a cement border be?
Thanks a ton for your time, - snipped-for-privacy@aol.com