Resistance to Fragmentation – Los Angeles Test

UKAS Accredited

Standard(s): BS EN 1097-2:2020
Lab Test
The Resistance to Fragmentation – Los Angeles Test evaluates the durability of coarse aggregates by measuring their resistance to abrasion, impact, and grinding. Conducted in accordance with BS EN 1097-2:2020, the test determines how well aggregates withstand mechanical stresses that occur during handling, compaction, and service within construction materials.

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The Process

A prepared sample of coarse aggregate is placed inside a rotating steel drum together with a specified number of steel balls. As the drum rotates, the aggregate is subjected to repeated impact and abrasion from the steel balls and the internal surfaces of the drum. After a set number of revolutions, the material is removed and sieved to determine the amount of fine material generated. The percentage of fragmented material is used to calculate the Los Angeles (LA) coefficient.

The Reason

Aggregates used in construction must be able to resist breakdown under mechanical stress. If aggregates fragment too easily, it can reduce the strength and durability of materials such as concrete, asphalt, and road base layers. The Los Angeles Test helps verify that aggregates meet required durability standards.

The Application

The Los Angeles Test is widely used to assess aggregates intended for concrete production, asphalt mixtures, road bases, and railway ballast. The results help engineers and contractors confirm that aggregates are sufficiently durable for their intended application and comply with relevant specifications.

Frequently Asked Questions

Where can I get Los Angeles aggregate testing in the UK?

Amtest provides Los Angeles resistance to fragmentation testing in accordance with BS EN 1097-2:2020, helping confirm that aggregates meet durability requirements for construction projects.

How quickly can Amtest carry out a Los Angeles Test?

Amtest offers efficient laboratory turnaround times to support project schedules. Our team can advise on sample quantities and expected reporting times when you arrange the test.

What materials can Amtest test using the Los Angeles method?

Amtest can test a wide range of coarse aggregates used in concrete, asphalt, road construction, and other structural applications.

How do I arrange Los Angeles aggregate testing with Amtest?

You can contact Amtest to organise sample delivery or discuss your testing requirements. Our laboratory team will guide you through the process and provide a detailed test report once the analysis is complete.

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Resistance to Fragmentation – Los Angeles Test

Subjects a coarse aggregate sample to abrasion, impact, and grinding.
BS EN 1097-2:2020
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Resistance to Fragmentation – Los Angeles Test

The Los Angeles (LA) Abrasion Test measures the resistance of coarse aggregates to fragmentation and wear. It subjects a sample of aggregate (retained on a No. 12 sieve) to abrasion, impact, and grinding inside a rotating steel drum with steel spheres.

The Process

  1. Sample Preparation: A sample of coarse aggregates is prepared, ensuring that only material retained on the No. 12 (1.70 mm) sieve is used.
  2. Test Procedure: The sample is placed in a rotating steel drum along with a specified number of steel spheres (usually 12 to 20). The drum is rotated for a set period, typically 500 to 1000 revolutions, subjecting the sample to abrasion and impact from both the spheres and the drum.
  3. Assessment: After the test, the sample is removed, and the percentage of material that has broken down into finer particles is calculated. The lower the percentage, the more durable the aggregate.

Why Is This Test Important?

  • Durability: Ensures that aggregates used in construction can withstand wear and impact during transportation, placement, and use in roads, pavements, and other structures.
  • Quality Control: Helps assess the suitability of aggregates for specific applications, particularly in environments where high wear resistance is required.
  • Regulatory Compliance: Meets industry standards for aggregate quality, ensuring the materials are fit for use in construction projects.

The Los Angeles Abrasion Test is critical for evaluating the durability of coarse aggregates used in construction. Get in touch to arrange reliable testing for your project.

BS EN 1097-2:2020