Pile Chipping is the extra pile that is above the cut off level, which provided for good and sound concrete. The main purpose of chipping is to remove the surplus slushy concrete (a mixture of concrete, slurry, and mud) over the cut off level. When concreting is going on, the black slush comes out from the borehole

Breaking down of the concrete piles has traditionally been carried out using hand-held pneumatic breakers. This method of work potentially exposes workers to significant health hazards associated with exposure to Hand Arm Vibration (HAV), dust and noise.