Hi all! great site. A couple years ago I put out some grape vines and put posts 2' in the ground to trellis them. I didn't have any bags of concrete at the time to put around the posts, so I mixed up my own concoction. I had some leftover sand and some small rock and a couple bags of mortar. I mixed all of that together and put around the posts. Unfortunately the grape vines died and now my son wants to pull the posts out. He tried to pull them out with his b-pole on his tractor but it bent the b-pole. I want to just saw them off and forget it but undaunted he went and got a heavier duty b-pole. It seems to me that the concoction I mixed is really strong, I tried to bust it loose with a hammer but it broke the hammer with the first hit. I don't want him to tear up the tractor messing with them, so before he tries again with the new pole, do any of you concrete guys know what I mixed and how strong it may be. Thanks !