What is BS EN 13108-4?

BS EN 13108-4 is a technical European Standard that specifies the requirements for asphalt mixtures used in road construction and maintenance. It defines the different types of asphalt and their characteristics, as well as the testing methods and performance criteria for asphalt materials.

Types of Asphalt Mixtures

According to BS EN 13108-4, there are several types of asphalt mixtures, each with specific properties and applications. These include:

Stone Mastic Asphalt (SMA): SMA is a dense mixture consisting of a coarse aggregate skeleton and stone-on-stone mastic mortar. It provides excellent durability and resistance to deformation, making it suitable for heavy traffic loads.

Dense Bituminous Macadam (DBM): DBM is a dense mixture with a high bitumen content, ensuring good resistance to deformation and cracking. It is commonly used as a binder course in road construction.

Asphalt Concrete (AC): AC is a relatively open mixture with good water drainage properties. It is suitable for lower traffic loads and used mainly as a surface course.

Testing Methods for Asphalt Mixtures

BS EN 13108-4 specifies various tests to assess the performance and quality of asphalt mixtures. These tests include:

Marshall Test: The Marshall Test measures the stability, flow, and density of asphalt mixtures. It helps evaluate the resistance to deformation and rutting under heavy loads.

Wheel Tracking Test: This test simulates the effect of repeated traffic loads on asphalt surfaces. It assesses the resistance to rutting and deformation caused by wheel loads.

Binder Drainage Test: This test measures the ability of the asphalt mixture to drain water efficiently, preventing water accumulation and potential damage to the road structure.

Performance Criteria

BS EN 13108-4 sets performance criteria that asphalt mixtures must meet to ensure their suitability for road construction and maintenance. These criteria include:

Stability: The mixture should have sufficient stability to resist deformation and rutting, maintaining its structural integrity under heavy traffic loads.

Resistance to Cracking: Asphalt mixtures should have good resistance to cracking to prevent the penetration of water and ensure long-term durability.

Surface Texture: The surface of the asphalt should provide adequate skid resistance and grip for vehicles, ensuring safe driving conditions.

In conclusion, BS EN 13108-4 is a comprehensive standard that defines the requirements for asphalt mixtures used in road construction. Following these specifications ensures the quality, performance, and longevity of asphalt pavements, ultimately contributing to safer and more durable road infrastructure.