What is a potential issue associated with pumped concrete?

The potential issue associated with pumped concrete is primarily the increased risk of segregation. When concrete is pumped, the force of the pump can cause the heavier aggregates to settle towards the bottom, while lighter materials and entrained air may rise to the surface. This segregation can lead to inconsistent concrete quality, weak spots, and reduced durability in the finished product.

While excessive increase in entrained air might be a concern in certain scenarios, it is not as directly tied to the pumping process itself. Instead, issues like rapid setting time or a low water-to-cement ratio, while they can occur as resultants from pump concrete in other contexts, are not inherent issues specific to the action of pumping. Therefore, the focus remains on separation of materials, evident in the increased risk of segregation.