What tool can an aggregate sample be divided into quarters with?

The tool that is used to divide an aggregate sample into quarters is a rod, a square point shovel, or a pipe. This method is effective for ensuring a representative sample is obtained by systematically dividing the material into smaller, manageable portions.

Using a rod allows for the material to be partitioned accurately, while a square point shovel facilitates the process of scooping and moving the aggregate without losing the integrity of the sample. A pipe can also be used to guide and separate the materials appropriately.

In this context, the focus is on performing the quartering method correctly, which is essential for obtaining a reliable sample for testing purposes. The other choices do not serve this specific function effectively; a hammer and chisel are more suited for breaking or shaping materials, a knife or blade could be misleading because it is typically used for cutting rather than for sampling methods, and a bucket or container is primarily for holding materials rather than for dividing them accurately into quarters.