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Understanding Class 6 Road Base: Composition, Benefits, and Uses in Construction Projects

Class 6 road base, also known as Class 6 aggregate base course (ABC), is a type of material used in road construction and paving projects. It typically consists of a blend of crushed rock, gravel, sand, and fines. Here’s a breakdown of what is generally included in Class 6 road base:

  1. Crushed Rock: The primary component, often consisting of various types of crushed stone or crushed gravel. These rocks provide structural integrity and stability to the base layer.

  2. Gravel: Smaller pieces of rock or pebbles that add to the mixture, providing additional stability and aiding in drainage.

  3. Sand: This fills the gaps between larger particles, helping to create a compact and solid base.

  4. Fines: Fine particles, such as silt and clay, that fill the smallest gaps and help bind the larger particles together.

The mixture is carefully graded to meet specific size requirements, ensuring that the particles fit together well to form a dense and stable base layer. The goal is to achieve a strong foundation that can support the loads imposed by traffic and prevent deformation or shifting over time.

Properties and Benefits

  • Compaction: Class 6 road base compacts well, creating a solid foundation.

  • Drainage: Properly mixed, it allows for good drainage, reducing the risk of water pooling and weakening the base.

  • Strength: It provides sufficient strength and durability to support heavy loads.

  • Versatility: Suitable for a variety of projects, including highways, driveways, and other paved areas.

Typical Use Cases

  • Road Construction: Essential for creating a stable foundation for roads.

  • Driveways and Parking Lots: Provides a stable and durable surface.

  • Road Shoulders: Used to support the edges of pavements and prevent erosion.

  • Sub-base for Pavement: It’s commonly used as a base layer beneath asphalt or concrete pavements.


Class 6 road base is a versatile and essential material in the construction of durable and stable foundations for roads, driveways, parking lots, and more. Its carefully graded blend of crushed rock, gravel, sand, and fines ensures optimal compaction, strength, and drainage, making it an ideal choice for various construction projects. Understanding its composition and benefits allows for better application and performance, ensuring long-lasting and reliable results.


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