ASTM D3319-23 PDF

Overview

ASTM D3319-23: Standard Practice for the Accelerated Polishing of Aggregates Using the British Wheel outlines a laboratory procedure to simulate the polishing action of vehicular traffic on coarse aggregates used in bituminous (asphalt) pavements. The method uses an apparatus commonly called the "British Wheel" to estimate the degree to which different aggregate types may polish under traffic-like conditions. The test provides a polish value, which indicates an aggregate’s resistance to polishing-a key property for ensuring pavement surface friction and, thus, roadway safety.

Testing using ASTM D3319-23 ensures reliable, repeatable data for aggregate classification, aiding in the selection of materials for surfaces where friction performance is critical.

Key Topics

• Purpose of Testing: The practice is designed to assess and compare the polishing resistance of various coarse aggregates, simulating the abrasion and wear from vehicular traffic.

• Polish Value Determination:

  • The polish value offers a quantitative measure to rate and classify aggregates for their ability to maintain surface friction.
  • The method includes initial friction testing, accelerated polishing, and post-polishing friction measurements using a British Pendulum Tester.

• Apparatus and Materials:

  • Utilizes a specialized accelerated polishing machine (British Wheel) with specified tire compositions and mounting arrangements for aggregate specimens.
  • Test incorporates silicon carbide grit, water feed, control aggregates, and calibration steps to maintain test reliability.

• Test Procedure:

  • Coarse aggregate samples are molded, subjected to the polishing cycle, and their friction values measured regularly.
  • Ensures specimen and apparatus calibration, control specimens for reproducibility, and detailed environmental controls during testing.

• Reporting:

  • Comprehensive reporting is required, including aggregate identification, initial and final friction values, environmental conditions, control charts, and testing durations to allow for consistent, documented comparison.

Applications

The accelerated polishing test is crucial in pavement engineering and quality assurance for road construction. Its practical applications include:

• Aggregate Source Evaluation: Determining if a specific aggregate supply is suitable for use in high-traffic pavement by measuring its long-term frictional performance.
• Quality Control in Road Building: Routine testing ensures only aggregates with adequate polishing resistance are used, improving road safety.
• Research and Development: Used by materials scientists and pavement engineers to develop new or improved aggregates with enhanced friction retention properties.
• Regulatory Compliance: Helps agencies comply with transportation safety requirements by ensuring aggregate materials meet established friction performance standards.

By providing a consistent method for testing, ASTM D3319-23 supports decision-making for selection and approval of pavement materials with a focus on optimizing roadway surface friction and reducing accident risks.

Related Standards

Several other ASTM standards are closely associated with or referenced in ASTM D3319-23, each contributing to a comprehensive approach in aggregate testing and pavement material evaluation:

• ASTM D75/D75M - Sampling Aggregates
• ASTM C778 - Standard Sand for use in testing
• ASTM D3666 - Requirements for agencies testing and inspecting road and paving materials
• ASTM E11 - Woven Wire Test Sieve Cloth and Test Sieves
• ASTM E303 - Test Method for Measuring Surface Frictional Properties Using the British Pendulum Tester
• ASTM E501 - Standard Rib Tire for Pavement Skid-Resistance Tests
• ASTM D1415 - Test Method for Rubber Property-International Hardness

Ensuring compliance with these related standards enhances the reliability, consistency, and acceptance of polishing resistance tests within the pavements and construction materials industries.

Keywords: ASTM D3319-23, accelerated polishing, British Wheel, aggregates, polish value, pavement friction, bituminous pavements, road safety, material testing, surface friction, aggregate classification.