ASTM D6933-22 PDF

Overview

ASTM D6933-22: Standard Test Method for Oversized Particles in Emulsified Asphalts (Sieve Test) is an internationally recognized method developed by ASTM International. This standard provides a defined procedure to determine the proportion of oversized particles, such as asphalt agglomerates or discrete solids, that are retained on an 850-μm mesh sieve in emulsified asphalts. Monitoring oversized particles in asphalt emulsions is critical because excessive particles may impede the material’s handling and application performance during storage, transport, and construction processes.

This test method establishes standardized practices to assess material consistency and quality, contributing to the reliable use of emulsified asphalts in road construction and maintenance.

Key Topics

• Significance and Use:

  • Identifies issues caused by excessive oversized particles, which can occur due to agglomeration, inadequate material handling, temperature, or contamination during transport and storage.
  • Provides an early indicator of potential problems in material performance, such as clogging of equipment or poor surface finish.

• Test Method Scope:

  • Applies to all emulsified asphalts, both cationic and anionic, that are subjected to particle size retention testing.
  • The procedure measures particles retained on a standard 850-μm sieve, using measurements exclusively in SI units.

• Quality and Reliability:

  • Stresses the importance of both operator competence and equipment calibration for accurate and repeatable results.
  • Agencies following ASTM D3666 are viewed as capable of performing competent testing and inspection, but additional quality assurance measures are recommended for consistent outcomes.

• Safety Considerations:

  • Users are responsible for complying with safety, health, and environmental regulations relevant to the standard’s application.

Applications

The ASTM D6933-22 test method is primarily used for:

• Quality Control in Asphalt Production:

  • Ensures emulsified asphalt products are free of problematic oversized particles before shipment or application.
  • Helps producers meet client or project specifications for material quality.

• Construction and Road Maintenance:

  • Assists in verifying the suitability of emulsified asphalts for use in paving, sealing, and surface treatment operations.
  • Prevents issues such as equipment blockages, uneven application, or premature failure.

• Material Evaluation in Laboratories:

  • Used by third-party testing labs to provide independent verification of asphalt emulsion quality.
  • Supports research and development of new or modified emulsified asphalt formulations.

Related Standards

Several related ASTM standards support or complement the application of ASTM D6933-22, including:

• ASTM D3666: Minimum requirements for agencies inspecting and testing road and paving materials, ensuring testing competency and objectivity.
• ASTM D7496: Test method for measuring the viscosity of emulsified asphalts, relevant for determining appropriate test temperatures.
• ASTM E1: Specification for liquid-in-glass thermometers used during sample conditioning.
• ASTM E11: Specification for woven wire test sieve cloth and test sieves, ensuring sieve consistency and reliability.

By following ASTM D6933-22, organizations ensure emulsified asphalts are consistently evaluated for oversized particles, promoting quality control and reliable field performance. Proper adherence to this standard reduces operational issues during storage, transportation, and application, supporting durable road construction and maintenance practices. For those involved in asphalt production, testing, or construction, this standard is an essential resource for maintaining high quality and regulatory compliance.