Los Angeles Abrasion Machine
NL 1008 X / 003

Standard: ASTM C131, EN 1097-2

Los Angeles Abrasion Machine

Los Angeles Abrasion Machine is used to measure the degradation of mineral aggregate resulting from a combination of actions including abrasion, impact, and grinding in a rotating steel drum containing steel spheres, evaluating the resistance of aggregates like rocks and gravels to wear. The test involves a sample of aggregate to abrasion using steel balls in a rotating drum. The abrasion loss result is then measured as a percentage of the original sample weight, indicating the aggregate's durability and suitability for various construction applications. This test determines the quality and longevity of materials used in road construction, concrete production, and other civil engineering projects.

Features of Los Angeles Abrasion Machine

• Sound Proof Cabinet: This helps reduce noise during operation, providing a quieter testing environment.

• Control Panel: Allows for easy control and adjustment of the machine's drum speed and monitors the testing process.

• Receiving Tray: Collects the aggregate and abrasion debris during testing, ensuring easy cleanup and analysis afterward.

• Drum Speed 31 - 33 RPM: The rotating drum operates at a specified speed range to ensure consistent and accurate testing conditions.

• ASTM, AASHTO, UNI, CNR Abrasive Charges (Set of 12 nos.): Accessories Option offering a set of abrasive charges compliant with various standards (ASTM, AASHTO, UNI, CNR) for testing different types of aggregates and meeting specific testing requirements. Inside the drum, a specified number of steel spheres or balls are placed. These balls have a standard diameter and are used to subject the aggregate sample to abrasion, impact, and grinding.

Technical Specifications of Los Angeles Abrasion Machine

Unit Consists Of:

Optional Accessories

Standards

• ASTM C131: Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine. This standard outlines procedures for conducting the Los Angeles Abrasion Test, which evaluates the hardness, toughness, and durability of small-size coarse aggregates (typically used in concrete) by subjecting them to abrasion and impact in the Los Angeles Abrasion Machine.

• EN 1097-2: A European standard about “Tests for Mechanical and Physical Properties of Aggregates. Determination of Resistance to Fragmentation of coarse aggregates by subjecting them to abrasion, impact, and grinding in the Los Angeles Abrasion Machine. Provides detailed procedures for conducting the test, including sample preparation, operation of the machine, and calculation of abrasion loss.

Test Procedure of Los Angeles Abrasion Machine

• Sample Preparation:
  • Obtain a representative sample of the aggregate material to be tested. The sample should be large enough to provide a statistically significant result.
  • Ensure that the sample is clean, free of dust, and has been properly dried to remove moisture.

• Preparation of Test Apparatus:
  • Set up the Los Angeles Abrasion Machine according to the manufacturer's instructions.
  • Place a specified number of steel spheres or balls (usually between 12 and 48) inside the rotating drum.
  • Ensure that the drum is securely mounted and capable of rotating horizontally around its axis.

• Test Specimen Loading:
  • Measure the appropriate amount of aggregate sample according to the test specifications (typically between 5,000 and 10,000 grams).
  • Place the aggregate sample into the rotating drum along with the steel spheres.

• Test Operation:
  • Close the drum lid securely to prevent spillage during testing.
  • Start the rotation of the drum at a specified speed, usually between 31 and 33 revolutions per minute (RPM).
  • Allow the drum to rotate for a predetermined number of revolutions, typically between 500 and 1000.

• End of Test:
  • After the specified number of revolutions, stop the rotation of the drum.
  • Carefully remove the aggregate sample from the drum and transfer it to a receiving tray or container.
  • Collect any fine particles or debris generated during the test for further analysis.

• Measurement and Calculation:
  • Weigh the collected aggregate sample and record the weight accurately.
  • Calculate the abrasion loss as a percentage of the original sample weight using the formula: Abrasion Loss (%)=((Initial Weight−Final WeightInitial Weight) / Initial Weight) ×100
• Reporting:
  • Report the test results, including the abrasion loss percentage, along with any relevant information such as the type of aggregate, test conditions, and test standard followed.
• Quality Control
  • Ensure that the test procedure is performed according to the appropriate standard (e.g., ASTM C131, EN 1097-2) and in compliance with any relevant specifications or regulations.
  • Conduct regular calibration and maintenance of the Los Angeles Abrasion Machine to ensure accurate and reliable test results.