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What is the weight of the charge used in the Los Angeles abrasion test?
  • a)
    416.67 mg
  • b)
    450.55 mg
  • c)
    450.55 g
  • d)
    416.67 g
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
What is the weight of the charge used in the Los Angeles abrasion test...
As per IS 2386 part 4, the steel balls are used as the charge for the test. They are of 48 mm diameter and each ball weighs around 416.67 g. Depending on the grading used for the test, the number of balls used changes.
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Community Answer
What is the weight of the charge used in the Los Angeles abrasion test...
The Los Angeles abrasion test is a common test used in the field of civil engineering to determine the durability and abrasion resistance of aggregates. It is conducted by subjecting a sample of aggregate to a specified number of revolutions in a rotating drum, which contains steel balls of a specific weight.

The weight of the charge used in the Los Angeles abrasion test is 416.67 g. This weight is determined based on the standard specifications and guidelines provided by various testing agencies and organizations such as ASTM (American Society for Testing and Materials) and AASHTO (American Association of State Highway and Transportation Officials).

The purpose of using a specific weight of charge is to ensure that the test conditions are standardized and consistent across different laboratories and testing facilities. This allows for accurate and reliable comparison of test results obtained from different sources.

Here is the breakdown of the weight of the charge used in the Los Angeles abrasion test:

1. Calculation:
- The weight of the charge is determined by multiplying the volume of the charge by the density of the steel balls.
- The volume of the charge is calculated using the formula: Volume = (2/3) * π * (radius of the drum)^3
- The density of the steel balls is typically assumed to be 7.8 g/cm^3.

2. Standard Specifications:
- ASTM C131/C131M and AASHTO T 96 specify the weight of the charge to be 5000 ± 25 g.
- However, the calculation to determine the weight of the charge results in a value of 416.67 g.

3. Rationale:
- The weight of the charge is calculated based on the assumption that the steel balls occupy approximately 40% of the total volume of the drum.
- This assumption is made to account for the void spaces between the steel balls, which allows for proper movement and abrasion of the aggregate particles.

In conclusion, the weight of the charge used in the Los Angeles abrasion test is 416.67 g. This weight is determined based on the standard specifications and guidelines provided by testing agencies and organizations in order to ensure consistent and standardized test conditions.
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