What should be avoided when using pump lines for concrete delivery?

When using pump lines for concrete delivery, fast pumping speeds should be approached with caution. While it may seem advantageous to speed up the concrete placement process, fast pumping can lead to various issues. These include the risk of segregation, where the heavier aggregates settle at the bottom and the finer cement paste rises to the top, resulting in a non-homogeneous mix. Additionally, rapid pumping can increase the likelihood of blockages in the pump lines, requiring time-consuming interventions to clear them.

Maintaining a consistent and controlled pumping speed ensures that the concrete is delivered in a uniform manner, allowing for proper mixing and decreasing the chances of defect formation in the final structure. This practice is vital to achieving a strong and durable concrete placement, highlighting the necessity of controlled pump performance.