My concrete foundation has a curb of approximately 6 inches above the carport and a breezeway leading to my back door. The appearance of the curb is unsightly. It looks like the forms were knocked off before the concrete fully cured, resulting in rough, irregular faces, but no exposed aggregate. I'm looking for a cosmetic fix. I thought about cutting porcelain tile in gray slate color, applying a thin mortar bed, and grouting the individual sections of tile, but this is a pretty time-intensive job. Another option would be to apply some type concrete bonding agent with thinset and trowel it smooth. Any suggestions?