I extended my cement floor front porch to the full width of my house by having a contractor add to an existing porch. However, the new part of the porch appears to be sinking (settling too much). The porch floor has settled so that the old and new porch floor sections are uneven. This leads to water settling next to the house when it rains, there is danger of someone tripping as they walk from one end of the porch to the other and the floor looks unsightly. I have tried to add concrete adhesive to build up the newer section of the porch, but it simply chips and breaks up after awhile. Will I have to replace the entire cement floor? Should I add a layer of outdoor porcelain tile or natural stone to even out the floor? Or is there another solution?