ASTM D6372-23 PDF

Overview

ASTM D6372-23: Standard Practice for Design, Testing, and Construction of Microsurfacing provides comprehensive guidelines for the use of microsurfacing mixtures in road maintenance and surface treatment. Developed by ASTM International, this standard outlines best practices for mix design, laboratory testing, and construction methods specific to microsurfacing, a technique widely used to improve paved surfaces using polymer-modified asphalt emulsion, aggregates, mineral filler, water, and additives.

This document is intended as a guide, not a specification, and encourages users to adapt end-use specifications to their particular job and user requirements. It emphasizes the importance of competent personnel, well-maintained equipment, and adherence to quality assurance standards for delivering reliable microsurfacing results.

Key Topics

• Mix Design and Proportioning: Guidance on selecting and proportioning polymer-modified asphalt emulsion, quality aggregates, mineral fillers, and other additives.
• Testing Procedures: Definitions and explanations of essential laboratory tests, such as cohesion, wet track abrasion, loaded wheel, and compatibility tests, to ensure durability and performance.
• Application Techniques: Recommendations for the practical application of microsurfacing mixtures, including equipment requirements, spreading methods, and finishing techniques.
• Construction Process: Detailed steps for site preparation, surface cleaning, weather limitations, and application consistency to achieve durable, high-performance pavement surfaces.
• Quality Assurance: Emphasis on the calibration of mixing equipment, performance of trained personnel, and adherence to referenced quality standards such as ASTM D3666.

Applications

Microsurfacing, as defined in ASTM D6372-23, is a cost-effective pavement preservation solution suitable for a variety of paved surfaces. Key applications include:

• Urban and Residential Streets: Type II microsurfacing is ideal for streets with moderate traffic, as well as airport runways, providing a smoother ride and improved surface friction.
• Primary and Interstate Highways: Type III microsurfacing is used for high-traffic roads and rut-filling applications, restoring ride quality and extending pavement life.
• Rutted Wheelpaths: The standard provides guidance for reprofiling ruts, allowing engineers to estimate material requirements for effective rut leveling.
• Preventive Maintenance: Microsurfacing improves surface texture, seals minor cracks, and postpones more costly rehabilitation, reducing long-term maintenance costs.
• Airports, Parking Lots, and Industrial Sites: Microsurfacing is adaptable to a wide range of paved facilities requiring rapid return to service and enhanced surface performance.

Related Standards

Proper implementation of ASTM D6372-23 often involves coordination with related standards and guidelines, including:

• ASTM D3666: Specification for minimum requirements for agencies testing and inspecting road and paving materials.
• ASTM D3910: Practices for the design, testing, and construction of slurry seal, related to microsurfacing techniques.
• ASTM D8: Terminology relating to materials for roads and pavements.
• ASTM D2397: Specification for cationic emulsified asphalt.
• ASTM C88, C131, D2419: Standards for testing aggregate soundness, abrasion resistance, and sand equivalent value.
• ISSA Technical Bulletins: Specific methods and guidelines from the International Slurry Surfacing Association, referenced for additional laboratory procedures and application recommendations.

Practical Value

Using ASTM D6372-23 helps ensure the quality, durability, and cost-effectiveness of microsurfacing applications. This standard supports asset management objectives by offering:

• Extended pavement lifespan through preventative surface treatment.
• Improved ride quality and traffic safety by restoring surface texture and friction.
• Consistency in performance using verified laboratory test methods and quality-controlled application processes.
• Sustainability by minimizing resource use and extending maintenance intervals for paved surfaces.

For pavement engineers, contractors, and asset managers, compliance with ASTM D6372-23 provides a structured, internationally recognized approach to superior microsurfacing project outcomes.