The first concrete countertops used the same mix that went into driveways.
Which they dumped into a form on top of kitchen cabinets. Problem is, small cracks, texture variations or an indiscriminate gray tone work fine for a driveway, not so much for a countertop. While the practice persists, it shouldn’t. New ingredients and refined procedures have led to what might be called “high performance” concrete, which is characterized by higher strength and density than the sidewalk variety, as well as less shringkage/warping and scratch and stain resistance — attributes that help it stand up to Aunt Cindy's margaritas — not to mention salad dressing, wine, toothpaste, and so on.
