Table of Contents

• 1. Introduction
  • 1.1 Background and Problem Statement
  • 1.2 Objectives
  • 1.3 Scope of Work
• 2. Road Dust Suspension: Effect on Unpaved Road Maintenance
  • 2.1 Introduction
  • 2.2 Unpaved Road Definition and Classification
  • 2.3 Unpaved Road Characteristics
  • 2.4 Type of Aggregate (Gravel) Mixes
  • 2.5 Unpaved Road Deterioration Mechanism
  • 2.6 Dust Suppression Measures
    • 2.6.1 Water (fresh and sea)
    • 2.6.2 Chloride Compounds
    • 2.6.3 Lignin Derivatives
    • 2.6.4 Resinous Adhesive
  • 2.7 Effectiveness of Dust Suppressants
  • 2.8 Effects of Aggregate Distribution on Effectiveness of Dust Suppressants
    • 2.8.1 Test Sections
      • 2.8.1.1 Locations
    • 2.8.2 Materials
    • 2.8.3 Construction
    • 2.8.4 Measurements
      • 2.8.4.1 Traffic
      • 2.8.4.2 Dust
    • 2.8.5 Results
• 3. Road Dust Suppression: Effect on Unpaved Road Stabilization
  • 3.1 Introduction
  • 3.2 Method of Application
  • 3.3 Factors Influencing Stabilization
  • 3.4 Ligninsulfonate (Lignin)
  • 3.5 Chloride Compounds (CaCl₂ and MgCl₂)
  • 3.6 Summary of Research Studies
  • 3.7 Summary
• 4. Road Dust Suspension: Effect on Unpaved Roads Safety and the Environment
  • 4.1 Introduction
  • 4.2 Safety Concerns
  • 4.3 Environmental Impact
    • 4.3.1 Chloride Compound Additives
    • 4.3.2 Lignin Additive
  • 4.4 Summary
• 5. Conclusions
  • 5.1 Introduction
  • 5.2 Road Dust Suppression - Effect on Maintenance
  • 5.3 Road Dust Suppression - Effect on Stabilization
  • 5.4 Road Dust Suppression - Effect on Safety and The Environment
  • 5.5 Recommendation for Future Studies
• 6. References
• 7. Appendix
  • Appendix A - Suppressants and Their Characteristics*
  • Appendix B - Dust Measurement Data*

*available in the PDF version

Road Dust Suppression: Effect on Maintenance Stability, Safety and the Environment
Phases 1-3

Jonathan Q. Addo, PE
Thomas G. Sanders, Ph.D., PE
Melanie Chenard, E.I.T.

May 2004

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