Innovative Use of Dam Sediments and Eucalyptus Ash in Road Construction Yields Positive Results

Researchers at King Mongkut's University of Technology North Bangkok, in collaboration with Thailand Science Research And Innovation and National Research Council of Thailand, have made significant breakthroughs in sustainability research, exploring the innovative use of dam sediments stabilized with eucalyptus wood ash and cement as sustainable materials for road construction. This pioneering study has demonstrated a cost-effective and eco-friendly alternative to traditional methods, with promising results from destructive and non-destructive tests. The study's findings have far-reaching implications for the principles of circular economy and sustainability, paving the way for the integration of waste materials into high-performance construction applications.

Key Takeaways:

• The innovative use of dam sediments stabilized with 10% eucalyptus wood ash and cement achieved an unconfined compressive strength of 7.7 MPa after 28 days, marking a 770% improvement over untreated sediments.
• The optimal mixture containing 10% EA and cement surpassed subbase material standards, with a peak California bearing ratio value of 55%.
• Nondestructive tests revealed strong correlations between compressive strength and wave velocities, with shear and compressional wave velocities reaching 600 and 990 m/s, respectively.
• Microstructural analyses showed significant formation of calcium silicate hydrate, with a 30% increase in content, enhancing interparticle bonding and sediment densification.
• Leaching tests confirmed the environmental safety of the materials, highlighting their potential as a green and economically viable solution for road construction.
• The study introduced a novel framework for cost analysis, revealing a 6.6-fold reduction in construction costs due to the local availability of stabilized sediments.
• The research concluded that the innovative integration of waste materials into high-performance construction applications advances the principles of circular economy and sustainability.

Statistics:

• The optimal mixture of dam sediment and eucalyptus wood ash achieved a 770% improvement in unconfined compressive strength over untreated sediments.
• The California bearing ratio test yielded a peak value of 55%, surpassing subbase material standards.
• The nondestructive tests revealed strong correlations between compressive strength and wave velocities, with shear and compressional wave velocities reaching 600 and 990 m/s, respectively.
• Microstructural analyses showed a 30% increase in calcium silicate hydrate content, enhancing interparticle bonding and sediment densification.
• The cost analysis revealed a 6.6-fold reduction in construction costs due to the local availability of stabilized sediments.

Sources:

• Sustainable road construction materials incorporating dam sediment and eucalyptus ash waste: A circular economy framework. Case Studies in Construction Materials, 2025, 22():e04118. (Case Studies in Construction Materials - https://www.journals.elsevier.com/case-studies-in-construction-materials//)
• Thailand Science Research And Innovation
• National Research Council of Thailand
• King Mongkut's University of Technology North Bangkok