In Item 303, at what rate should cover aggregates be evenly spread over the surface?

The correct choice indicates that the cover aggregates should be spread over the surface at a rate of 0.004 to 0.007 cubic meters per square meter (m³/m²). This range is important for ensuring proper coverage and performance of the aggregates when applied to surfaces such as pavements or floors in materials engineering contexts.

Using an appropriate rate helps achieve a balance between structural integrity and material efficiency. Too little coverage may result in inadequate protection or interference with the underlying materials, while too much could lead to wastage and increase costs unnecessarily.

It’s essential to adhere to specified practices and standards, such as Item 303, to ensure that the application of these aggregates meets engineering requirements and promotes durability, stability, and safety of the constructed surfaces. This range is most likely derived from industry standards or empirical data validated through testing and performance evaluations in real-world applications.