If the bitumen viscosity is high, the fluid friction resistance of the bitumen will be large, the spurting molding will be small, and the number of overlaps will be reduced. In order to get rid of this problem, the general approach is to increase the diameter of the nozzle, but this will inevitably reduce the water jet speed, weaken the "impact-splash-evening" effect, and make the penetration layer uneven. In order to better improve the technical characteristics of asphalt construction, the characteristics of asphalt should be improved.

At present, there are some bitumen spreading trucks on the market that have unsatisfactory permeability effects and may have horizontal unevenness in the permeability layer. A typical lateral unevenness is the transverse pattern of the permeability layer. At this time, certain measures can be taken to effectively improve the lateral uniformity of the asphalt layer. The speed of the fully intelligent bitumen spreading truck only needs to be changed within the effective range, which will have no impact on the vertical uniformity of the asphalt layer. Because when the speed is faster, the amount of asphalt splashed per unit time becomes larger, but the amount of asphalt spread on the total area of ??the enterprise remains unchanged. Changes in speed have a great impact on the lateral uniformity.

If the height of the spray pipe from the ground is too high, it will reduce the impact force of bitumen spraying and weaken the "impact splash-homogenization" effect; if the height of the spray pipe from the ground is too low, it will reduce the impact of bitumen spraying. The overlap number of fan painting should be adjusted according to the actual situation to improve the asphalt spraying effect.