Red Seal Concrete Finisher Practice Exam

The term "bleeding" in concrete finishing refers specifically to the phenomenon where water from the mix rises to the surface after the concrete has been placed and is beginning to set. This occurs during the hydration process when the heavier solid particles settle down and the lighter water components migrate upwards. This upward movement can create a pool of water on the surface, which can affect the final finish and integrity of the concrete. Understanding bleeding is crucial for concrete finishers because excessive bleeding can lead to problems such as weak surfaces and poor adhesion of sealers or coatings. It also impacts how the finishing process can be conducted—finishing too early on a surface that hasn't stopped bleeding can disturb the mix and ruin the finish. Overall, recognizing and managing bleeding is an essential aspect of achieving quality concrete work.