Class 6C Material: What is it?

Class 6C Material

What is Class 6C?

You may have heard of Class 6C but what is it exactly? In the world of construction, Class 6C stands out as a specific kind of granular fill material that is consistently graded.

This classification is a part of the Series 600 Earthworks and plays a crucial role in ensuring the quality and performance of materials used in highway construction.

It primarily consists of crushed stone, typically a clean aggregate with a single size of 125mm. However, it can sometimes include small amounts of smaller materials.

It serves as starter layer and is applied as the first layer or layers of fill above the existing ground level or any ground that has been improved.


What materials can be used to produce Class 6C?

It can be produced using from a variety of sources, including quarried and recycled materials.

The materials suitable include natural gravel, natural sand, crushed gravel, crushed rock (expect for argillaceous rock), crushed concrete, chalk, well-burnt colliery spoil, slag and recycled aggregates.


What are the specifications?

When it comes to highway construction, specifications are a must. It needs to meet the requirements outlined in Series 600 Earthworks of the specification for Highway Work. This is crucial for ensuring the durability and reliability of highway infrastructure.

Compliance with these specifications is essential in maintaining the consistent quality of Class 6C materials.

Below are the specifications.


Table 6/2: Grading Requirements for Acceptable Earthworks Materials Other than Classes 6F4, 6F5 and 6S


Table 6/5: Imported Onto Site Grading Requirements for Class 6 Acceptable Earthworks Materials



Standards For Highways