The best way to maintain your concrete slab is to keep it clean, sealed, and well drained.

Clean your concrete as often as needed with a pressure washer. Seal it with a good siloxane based sealer every few years (water repellent). Last, but definitely not least, make sure your concrete is installed in a fashion that promotes proper drainage, preventing water from ever pooling on the slab. Water setting on slab is typically not an issue in the summer months, but cool winter temps can be a real problem in many ways.