Description. ABC Stands for Aggregate Base Coarse. This gravel is used as a hard pack sub-base compaction material for a variety of applications, most common applications we see are for base material for pavers, segmental retaining walls, or concrete slabs. It is made up of a mix of crushed stone, topsoil and dust.Click to see full answer. Keeping this in consideration, what is AB rock?Aggregate base is a construction aggregate typically composed of crushed rock capable of passing through a 20 millimetres (3⁄4 in) rock screen. Generally consisting of larger grade aggregate, spread and compacted to provide a stable base for further layers of aggregates or asphalt pavement.Also Know, what type of gravel is used for driveways? Top layer choices for gravel driveways might include crushed shale, limestone, granite and concrete, along with other types of gravel in various colors to meet your aesthetic needs. Herein, what is the difference between road base and gravel? The difference between drain rock and road base is the amount of fine material in the finished product. Drain rock has no fines therefore it allows water to pass through the gaps in the rocks easily, whereas road base has the fine particles of sand which allow it to compact and hold its shape.What is crushed rock called?Crushed stone or angular rock is a form of construction aggregate, typically produced by mining a suitable rock deposit and breaking the removed rock down to the desired size using crushers.