My fiance and I recently purchased our first home. It's a fixer upper. We are starting with the front yard which due to previous owners negligence is a disgrace. The patio had two giant cracks in the cement which I patched up. The next day the cement was cracked again right where I patched it up. What happened and how do I fix it?
There may be something they neglected to remove totally growing under it. Also, add extra water to the cement after you lay it, it's such a fine grain that it and the more water it gets the better it will completely seal.
they didnt get a good base under it would be my guess. so when the ground moves the slab moves. best bet...tear it out and have it done right. 4 in. base of crushed stone and a 4 in. slab. tell them you want a 3500 lb. mix, with air added and fiber added. make sure it is jointed correctly. you dont need a footer under a patio unless it is raised up, and then we call that a porch...
The problem is that the cement is shifting with temperature changes from day to night.The only real way to solve is to have it removed,footings poured and then concrete poured on the footings.
