When concrete is transported, what is the approximate loss of air?

When concrete is transported, an approximate loss of air in the range of 1-2% is expected. This loss occurs due to the agitation and movement of the concrete during transit, which can cause some of the entrained air bubbles to rise to the surface and escape.

Maintaining the correct air content in concrete is vital for its durability, workability, and performance. An air loss within this range typically indicates that the mix is still retaining adequate entrained air to provide the necessary properties while minimizing risks associated with excessive air loss, such as reduced concrete strength or susceptibility to freeze-thaw cycles.

Thus, recognizing the expected air loss during transit helps in planning and adjusting the concrete mix design accordingly to ensure the final product meets all required specifications.