Question: what are the 4 main types of aggregates?
Answer: Type 1: Granite Aggregates. This is the best aggregate for high-grade concrete, and as it comes in a variety of shades, like grey, red and pink, it can also be used as a decorative feature. ... 
Type 1: Limestone Aggregates. ... 
Gravel/Ballast Aggregates. ... 
Secondary Aggregates. ... 
Sand.