How to Remove Concrete from Rock

As a durable material used for various applications, including driveways and patios, concrete is made to last. Generally, a concrete mixture in a semi-liquid form is poured from the chute of a truck for a large project or from a bucket for a small project. The material hardens quickly and takes work to remove from objects on which it isn't wanted. If semi-liquid concrete splatters onto rock, wait for it to dry, chip away most of the material and then remove the remaining concrete from the rock with a special chemical.

Rubber gloves
Protective eyeglasses
Protective clothing
Rock chisel
Rock hammer
Muriatic acid (hydrochloric acid)
Large spray bottle
Large container or garden hose attached to faucet
Nylon-bristle scrub brush

Instructions

- 1
  Put on rubber gloves and protective eyeglasses. Wear protective clothing, such as long-sleeved shirts and long pants to protect your skin.
- 2
  Chisel large chunks of concrete carefully from the rock. Use a rock chisel and rock hammer to chip the concrete away from the stone. A rock hammer is small, lightweight and simple to control, which helps to prevent damage to the rock.
- 3
  Add 1 part muriatic acid (hydrochloric acid) into 10 parts water in a large spray bottle. Hold the bottle slightly away from your body to prevent inhaling the acid's fumes.
- 4
  Place rinse water next to yourself, such as water in a large container or water available from a garden hose. Spray the acid-water solution directly onto the concrete.
- 5
  Scrub the acid-water solution on the cement with a strong scrub brush that has stiff, nylon bristles. Rinse the solution with water. Add more solution and continue to scrub the concrete until you remove it from the rock.
- 6
  Rinse the rock well with water until all the acid-water solution is gone.

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