Which factor can negatively impact the adhesion of concrete to reinforcing steel?

Inadequate surface preparation of the steel is indeed a critical factor that can negatively impact the adhesion of concrete to reinforcing steel. Proper adhesion is essential for the composite action of concrete and steel, allowing them to work together effectively to resist loads. If the surface of the reinforcing steel is not adequately prepared, it may have contaminants such as oil, rust, or dirt, which can create a barrier between the concrete and the steel. This barrier can prevent the concrete from bonding effectively to the reinforcing bars, leading to potential issues such as delamination, reduced structural performance, and increased susceptibility to corrosion over time.

In contrast, high-quality aggregates, proper mixing and curing practices, and the correct amount of water all contribute positively to concrete's overall quality and performance. High-quality aggregates enhance the strength and durability of concrete. Proper mixing and curing practices ensure that the concrete achieves its intended properties, while the appropriate water-to-cement ratio affects workability and strength. Therefore, focusing on surface preparation of the steel is crucial for achieving the necessary bond that supports structural integrity.