Aggregates

AGGREGATE CRUSHING VALUE (ACV)

 

The Aggregate Crushing Value (ACV) test determines a material’s resistance to crushing under a gradually applied compressive load. It’s used to assess the strength of coarse aggregates, ensuring they meet quality standards for various construction applications, particularly in roads and pavements. A lower ACV indicates a stronger aggregate, while a higher value suggests weaker material. 

Here’s a more detailed look:

Purpose:
  • Quality Control:

    The ACV test is a crucial component of quality control in aggregate production and use, ensuring materials meet specific strength requirements for pavement durability. 

  • Material Suitability:

    It helps determine if an aggregate is suitable for specific applications, such as surface courses or base layers, where different strength requirements exist. 

  • Predicting Performance:

    By measuring resistance to crushing, the ACV test helps predict how well aggregates will withstand the stresses and strains of traffic and other loads in a pavement. 

How it’s Used:
  • Road Construction:

    Aggregates with lower ACV values are preferred for road construction as they are more resistant to crushing under traffic and roller compaction, leading to a longer pavement lifespan. 

  • Concrete:

    Aggregates used in concrete mixes are also evaluated for their ACV to ensure the concrete’s overall strength and durability. 

  • Other Applications:

    ACV is also relevant in other construction applications where aggregate strength is a key factor, such as in the construction of retaining walls or other structures. 

Key Considerations:
  • Sieve Size:

    The test typically focuses on coarse aggregates, often those passing a 15.0 mm sieve and retained on a 10.0 mm sieve. 

  • Load Application:

    A controlled compressive load is applied to a sample of aggregate, and the amount of material crushed to a finer size is measured. 

  • Standardized Conditions:

    The test is conducted under standardized conditions to ensure consistent results. 

  • Interpretation:

    A lower ACV (typically below 30%) indicates a stronger aggregate, while values above 30% may require further evaluation or the use of the 10% fines value test for more accurate assessment. 

In essence, the ACV test is a vital tool for evaluating the strength of aggregates, ensuring they meet the required standards for various construction applications and contributing to the durability and longevity of infrastructure projects. 

 

 

Consits of:

  • Steel cylinder 150mm, supplied with plunger and base plate
  • Metal Measure 115x180mm
  • Tamping rod 16x600mm