The volume method is based on density, and the gravimetric method is based on weight. Aggregates have a packing density, so there is porosity, and the concept of optimal subsequent matching. The gravimetric method is just It is more convenient, but it considers a small area, while the volume method considers more. When the packing density of your aggregate becomes smaller, it means that your void ratio becomes larger. In actual production, you cannot guarantee the surface area on the vehicle. The aggregates are all the same so there will be a slight deviation in the dosage.