what is Marl, why we Screen this materials and what are usages.

Описание: Reasons for Using Screen Material

1. *Drainage*: Screen material allows for good drainage, which helps to prevent water accumulation and reduce the risk of pavement damage.

2. *Stability*: The angular particles in screen material help to provide stability and resistance to deformation under traffic loads.

3. *Load Distribution*: Screen material helps to distribute loads evenly, reducing the stress on the underlying soil and preventing settlement.

4. *Prevents Settlement*: The screen material's high friction angle and stiffness help to prevent settlement and deformation of the pavement.
5. *Improves Ride Quality*: A stable and even base course helps to improve the ride quality of the road.

6. *Reduces Maintenance*: Using screen material as a base course can reduce maintenance needs, as it helps to prevent pavement damage and extends the lifespan of the road.

Characteristics of Screen Material
1. *Gradation*: Screen material typically has a well-graded particle size distribution, which helps to provide stability and drainage.
2. *Angular Particles*: The angular particles in screen material help to provide interlock and stability.
3. High Friction Angle.
Screen material typically has a high friction angle, which helps to provide stability and resistance to deformation.