In terms of aggregate properties, what is a problem that may lead to a poor concrete mix?

A problem that can lead to a poor concrete mix related to aggregate properties is segregation during handling. Segregation refers to the separation of different-sized particles within the concrete mix, which can occur during transport, pouring, or placement. When segregation occurs, the larger aggregates may settle at the bottom, while finer particles remain at the top, resulting in an uneven distribution of materials. This can lead to variability in the strength, durability, and overall quality of the concrete.

Proper handling and placement techniques are crucial to ensure that the mix maintains a uniform distribution of aggregates, thereby ensuring that the concrete achieves its intended performance characteristics. When segregation is minimized, the concrete mix remains homogeneous, allowing for better bonding between particles and improved structural integrity.

While excessive moisture content, inconsistent temperature, and high pH levels can negatively affect the quality of concrete, they are not directly related to the aggregate properties in the same way that segregation is.