Sand and Gravel Abrasion Test Methods: Standards, Procedures, and Technical Requirements

Abrasion testing measures the resistance of sand, gravel, and crushed stone aggregates to wear, impact, and grinding, providing essential quality data for pavement, concrete, and railway engineering. This guide explains the principal sand and gravel abrasion test methods—including the Los Angeles abrasion test, the Micro-Deval test, and the Aggregate Abrasion Value test—covering sample preparation, equipment, calculation procedures, and acceptance criteria based on ASTM, EN, ISO, and GB standards. Accredited third-party laboratories routinely perform these tests to support material qualification and quality control.

Technical Overview

Sand and gravel abrasion testing is a family of laboratory procedures used to evaluate the ability of mineral aggregates to resist degradation caused by abrasion, impact, and grinding actions. During service, aggregates in asphalt pavements, Portland cement concrete, base courses, and railway ballast are subjected to repeated contact stresses from traffic loads and maintenance equipment. Weak or friable particles gradually break down, generating fines that reduce drainage, stability, and structural performance.

Abrasion tests quantify this degradation by tumbling, rolling, or pressing a prepared aggregate specimen against an abrasive medium—typically steel spheres or standard silica sand—and measuring the resulting mass loss. The most widely applied methods include the Los Angeles abrasion test (ASTM C131 and ASTM C535), the Micro-Deval test (EN 1097-1 and ASTM D6928), the fine aggregate Micro-Deval test (ASTM D7428), and the Aggregate Abrasion Value test (EN 1097-8). In China, the corresponding requirements are specified in GB/T 14684 for sand and GB/T 14685 for pebbles and crushed stone used in construction.

The measured loss values are key acceptance parameters in construction specifications. Lower loss percentages indicate harder, more durable aggregates suitable for high-stress applications such as surface courses, airport pavements, and rail ballast, while higher values restrict use to lower-stress layers or non-structural fill.

Testing Samples

Coarse Aggregate Samples

Coarse aggregate specimens typically consist of crushed stone, gravel, or crushed gravel with nominal particle sizes between 19.0 mm and 37.5 mm for standard Los Angeles testing under ASTM C131, or between 37.5 mm and 63 mm for the large-size procedure in ASTM C535. The sample must be obtained by quartering or riffle splitting from a representative field sample so that the test fraction matches one of the prescribed standard gradings.

Fine Aggregate Samples

Fine aggregate, including natural sand, manufactured sand, and blended sand, is evaluated with wet attrition and abrasion procedures such as the fine aggregate Micro-Deval test (ASTM D7428). Because individual sand grains are too small for the Los Angeles drum geometry, test methods for fines rely on steel ball charges and water to generate inter-particle abrasion, and the resulting degradation is assessed by mass loss on a fine sieve.

Specimen Preparation

All specimens must be washed over the designated sieve to remove adhering dust and then dried to constant mass, usually in an oven at 110 ± 5 °C. Each grading fraction is weighed to the accuracy stated in the applicable standard—commonly to the nearest 1 g for a total charge of approximately 5000 g in Los Angeles testing. Accurate pre-test mass determination is essential because the final result is calculated directly from the mass difference.

Abrasive Media and Charge

The Los Angeles method uses steel spheres of approximately 46.8 mm diameter as the abrasive charge. The number of spheres depends on the grading selected: for example, 13 spheres for Grading A, 11 for Grading B, 8 for Grading C, and 6 for Grading D, with the total charge mass controlled within tight tolerances. Steel balls of about 5 mm diameter are used in Micro-Deval testing, where the charge interacts with the aggregate in the presence of water.

Testing Items

Depending on the selected method and specification requirements, sand and gravel abrasion testing programs typically report the following parameters:

• Los Angeles abrasion loss (percent wear), calculated as the mass percentage passing the designated sieve after 500 or 1000 drum revolutions.
• Micro-Deval coefficient for coarse aggregates, determined from the mass loss of a 10/14 mm specimen after wet tumbling with a steel ball charge.
• Micro-Deval loss for fine aggregates, measuring degradation and fines generation under wet abrasive action.
• Aggregate Abrasion Value (AAV), obtained by pressing aggregate particles against a rotating steel lap with sand as the abrasive medium.
• Aggregate Impact Value and related strength indices, frequently tested alongside abrasion for a complete durability profile.
• Post-test gradation analysis, documenting particle size degradation and the quantity of generated fines.

Testing Methods

Los Angeles Abrasion Test (ASTM C131 and ASTM C535)

The prepared specimen and the specified steel sphere charge are placed inside a hollow steel drum with an internal diameter of approximately 711 mm and an internal length of approximately 508 mm. A shelf plate fixed inside the drum lifts the aggregate and spheres as the drum rotates, causing them to fall and subject the particles to impact and grinding. The machine operates at 30 to 33 revolutions per minute for a total of 500 revolutions for standard gradings, or 1000 revolutions for the large-size procedure. After testing, the material is sieved over the designated sieve—1.70 mm for ASTM C131 and 4.75 mm for ASTM C535—and the loss is calculated as the original mass minus the retained mass, divided by the original mass and multiplied by 100. Results below 30 percent are generally considered indicative of excellent abrasion resistance, while values above 40 percent are typically rejected for heavy-duty surface applications.

Micro-Deval Abrasion Test (EN 1097-1 and ASTM D6928)

The Micro-Deval test evaluates aggregate resistance to wet attrition and abrasion, which correlates well with in-service field performance. A 500 g specimen of the 10/14 mm fraction is placed in a drum with approximately 5 kg of 5 mm steel balls and 2 liters of water. The drum rotates at 100 revolutions per minute for 2 hours, producing roughly 12,000 revolutions of low-energy, wet grinding action. After tumbling, the charge is washed over a 1.6 mm sieve, the retained material is dried to constant mass, and the Micro-Deval coefficient is reported as the mass loss percentage. Typical specification limits range from below 10 percent for premium aggregates to a maximum of 25 to 30 percent for general-purpose materials. ASTM D6928 describes the equivalent North American procedure for coarse aggregates.

Fine Aggregate Micro-Deval Test (ASTM D7428)

This method assesses the durability of fine aggregates by tumbling a saturated sand specimen with a charge of steel balls in water. Degradation is expressed as the percentage of original mass lost during the test. It is particularly useful for qualifying manufactured sand and screening the degradation potential of natural sand in asphalt and concrete mixtures.

Aggregate Abrasion Value Test (EN 1097-8)

The AAV test measures surface wear resistance by mounting aggregate particles in a flat specimen mold and pressing the exposed surface against a rotating horizontal steel disc. Standard sand is fed continuously between the aggregate and the disc, and the disc rotates for a fixed number of revolutions under a specified normal load. The AAV is computed from the mass loss of the aggregate surface, with lower values indicating superior resistance to polishing and wear. This method is widely used for surfacing aggregates where skid resistance over the service life is critical.

Chinese National Standard Methods

In the Chinese standard system, GB/T 14685 specifies classification and technical requirements for pebbles and crushed stone, including limits on Los Angeles abrasion loss for concrete aggregates, while GB/T 14684 sets the corresponding requirements for sand. Test procedures referenced by these standards follow the same fundamental principles of drum tumbling with steel sphere charges and mass-loss calculation, ensuring comparability of results with international practice.

Applications

Sand and gravel abrasion test data directly support engineering decisions across multiple sectors:

• Highway and airport pavement design, where abrasion loss governs the selection of surface course and base course aggregates.
• Railway engineering, where ballast durability requirements are defined by abrasion and impact resistance indices.
• Concrete production, where durable coarse and fine aggregates are qualified for structural and precast concrete.
• Asphalt mixture design, where aggregate hardness influences rutting resistance, skid resistance, and long-term performance.
• Quarry and mining quality control, enabling producers to monitor deposit variability and optimize crushing circuits.
• Recycled and secondary aggregates, where abrasion testing verifies suitability of construction and demolition materials for reuse.

FAQ

What is a typical acceptance criterion for Los Angeles abrasion loss?

Most pavement specifications limit Los Angeles abrasion loss to 30 percent or less for surface courses and premium applications, while values up to 40 or 50 percent may be accepted for base courses and lower-stress layers. The applicable limit should always be confirmed against the project specification.

How do Los Angeles and Micro-Deval results compare?

The Los Angeles test applies high-energy impact combined with grinding in a dry condition, whereas the Micro-Deval test applies low-energy wet attrition. Micro-Deval results frequently show better correlation with long-term field performance for asphalt and concrete aggregates, and many specifications now accept either or both methods.

How much material is required for testing?

A standard Los Angeles test generally requires approximately 5000 g of coarse aggregate conforming to one of the standard gradings. Clients are advised to submit a representative field sample of at least 25 to 40 kg so the laboratory can perform the necessary splitting, sieving, and check tests.

Can the Los Angeles machine be used for sand?

No. The Los Angeles method is designed for coarse aggregates because fine particles would be immediately lost through the discharge sieve without undergoing meaningful abrasion. Fine aggregates are evaluated with wet methods such as ASTM D7428.

How often should abrasion testing be performed?

For active aggregate sources, testing is commonly performed at the start of supply, whenever the quarry face or deposit changes, and at routine intervals during production—typically weekly to monthly depending on contract requirements. All testing should be conducted by accredited third-party laboratories or qualified in-house facilities using calibrated equipment.