Abrasion Value of Aggregate in Pavement

Definition: Abrasion value is the percentage of aggregate weight, which is lost after subjected to the standard abrasion test.

Importance: It is essential to determine the abrasion value of the aggregate used in pavement because the pavement's strength and durability depend on the quality of the aggregate used. Excessive abrasion can lead to a loss of surface texture, reduced skid resistance, and early failure of the pavement.

Standard Abrasion Test: The abrasion test is carried out by subjecting the aggregate sample to rubbing and impact stresses. The aggregate sample is placed in a drum with steel balls and rotated for a specific number of rotations. After the test, the aggregate sample is sieved through a 1.7mm sieve, and the weight loss is calculated as a percentage of the original weight of the sample.

Limiting Value: The limiting value of the abrasion value of the aggregate in pavement is specified by the standard specifications of the country. In India, as per IS 2386 (Part IV), the abrasion value should be less than 40% for the aggregate used in pavement construction.

Conclusion: The abrasion value of the aggregate used in pavement should be less than the specified limiting value to ensure the pavement's strength and durability. The limiting value varies from country to country, and it is specified by the standard specifications of the country. In India, the abrasion value should be less than 40% as per IS 2386 (Part IV).