What are the effects of uneven material distribution on the construction quality of the paver?

1. Reduced road surface flatness
Uneven force on the screed: When the material is unevenly distributed, the resistance of the screed during the paving process will also be different. Where there is more material, the resistance is large, and the screed will be lifted; where there is less material, the resistance is small, and the screed will sink. This makes it impossible for the screed to remain horizontal, resulting in wavy or uneven road surfaces.
Difficult to control paving thickness: Due to the uneven distribution of materials, when setting the paving thickness, it is impossible to ensure that the entire road surface can achieve a uniform thickness. Some places may be paved thicker, while others may be paved thinner, which seriously affects the flatness of the road surface.
2. Uneven compaction of the road surface
Differences in compaction effect: Uneven material distribution will lead to different compaction in different areas of the road surface. Places with more materials are relatively easy to compact, while places with less materials are difficult to compact to the same degree. This makes it easy for the road surface to be locally damaged during use, such as potholes and cracks.
Impact on the service life of the road: Uneven compaction will reduce the overall strength and stability of the road, accelerate the damage of the road, and thus shorten the service life of the road. For example, under the repeated action of vehicle loads, fatigue cracking will first appear in the area with insufficient compaction, and then extend to the entire road surface.
3. The segregation phenomenon of the road surface is aggravated
Separation of coarse and fine aggregates: Uneven distribution of materials can easily lead to separation of coarse and fine aggregates, that is, coarse aggregates are concentrated in certain areas, while fine aggregates are concentrated in other areas. This segregation phenomenon will make the structure of the road uneven. The area where coarse aggregates are concentrated has higher strength, but the anti-skid performance may be poor; the area where fine aggregates are concentrated is prone to oil spills, rutting and other problems.
Reduced road performance: Segregation will seriously affect the performance of the road surface, such as anti-skid, wear resistance, water stability, etc. For example, when driving on rainy days, roads with severe segregation are prone to water accumulation and slipping, affecting driving safety.
4. The appearance quality of the road surface is reduced
Uneven color and texture: Uneven material distribution will cause differences in the color and texture of the road surface. The areas with more materials have darker colors and coarser textures; the areas with less materials have lighter colors and finer textures. This uneven appearance affects the aesthetics of the road and reduces the overall image of the road.
Defects and flaws: Severe uneven material distribution may also cause defects and flaws in the road surface, such as pitting and honeycombs. These defects not only affect the appearance of the road surface, but also reduce the quality and service life of the road surface.