Much of the Houston area sits on expansive clay. When it rains, the soil swells; when it's dry, it shrinks and pulls away. Concrete on top of that soil is constantly being pushed and dropped, and if it wasn't built for the movement, it cracks.
Base preparation is the first defense. Excavating to the right depth, bringing in select fill, and compacting it in layers gives the slab a stable bed instead of resting directly on clay that's waiting to move.
Steel and thickness matter next. Rebar or wire mesh holds the slab together when it does crack, so a hairline crack stays a hairline instead of becoming a heaved slab. Driveways that carry vehicles need more thickness than a walkway.
Finally, control joints tell concrete where to crack. Every slab will crack eventually; well-placed joints make those cracks happen in straight, tidy lines instead of wandering across the middle of your driveway. When a section does fail, cutting it out at the joints and re-pouring gives a repair that ties in cleanly.
