What is the most critical factor to avoid during concrete placement?

Segregation of different components is indeed the most critical factor to avoid during concrete placement. This phenomenon occurs when the heavier particles of the concrete mix, such as coarse aggregates, separate from the lighter components, such as cement paste and fine aggregates. Segregation can lead to several issues, including inconsistent strength, reduced durability, and poor bond between the concrete and reinforcing materials.

When segregation occurs, the resulting concrete structure may exhibit weak points and voids, leading to a decreased load-carrying capacity and increased vulnerability to environmental factors. Maintaining a uniform mixture during placement is essential to ensure that the concrete achieves its intended performance characteristics.

While factors like excessive noise from machinery, worker fatigue, and insufficient supervision can impact the concrete placement process and possibly lead to errors or accidents, none of these factors directly compromise the structural integrity of the concrete mix in the same way that segregation does. Thus, preventing segregation is paramount in achieving quality and durability in concrete construction.