1, according to the specification requirements, gravel should meet a certain particle size range. For example, the regulations require the use of graded macadam between 15mm and 40 mm
2. The specification requirements will stipulate the aggregate content of crushed stones with different particle sizes. Aggregate content refers to the percentage of effective aggregate in crushed stone.
3. The specification will require graded macadam to have good drainage performance, so as to ensure that when it rains or the groundwater level rises, the water can be drained away quickly.
4. The specification will specify the maximum allowable settlement value of crushed stone during compaction. This is to ensure that roads, foundations or other structures remain flat and stable when in use.
5, used in cold areas, the specification will require it to have a certain degree of frost resistance, to avoid freeze-thaw damage.