ACI Concrete Flatwork Finishing Certification Practice Test

The correct response indicates that edging of concrete should begin 2 feet off the corner. This practice is essential to ensure that the edges receive adequate finishing treatment without risking damage to the corners of the slab. Starting the edging process too close to the corners can lead to issues such as chipping or cracking as the finisher works on the edges.

Additionally, beginning 2 feet away allows for better control and smoother finishing, as the finisher has room to maneuver without stepping too close to the corners, which are often the most vulnerable parts of the slab. This distance also helps in managing the slump and consistency of the concrete along the edges, promoting uniformity and enhancing the overall appearance of the finished work. Proper edging will also help facilitate water drainage and prevent pooling, which is a significant factor in maintaining the integrity of the concrete slab over time.