Performance, environmental impact, and cost evaluation of eucalyptus ash-stabilised dam sediments for sustainable pavement engineering
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Author list: Wongvatana N.; Lhajai S.; Poorahong H.; Jongpradist P.; Jamsawang P.
Publisher: Taylor and Francis Group
Publication year: 2025
Volume number: 26
Issue number: 1
ISSN: 1029-8436
eISSN: 1477-268X
Languages: English-Great Britain (EN-GB)
Abstract
This study explores the feasibility of using dam sediments stabilised with eucalyptus ash (EA) and cement as sustainable, cost-effective road construction materials. Typically considered waste, the sediments were combined with EA—known for its pozzolanic activity—and cement to enhance mechanical and environmental performance. Destructive tests included unconfined compressive strength (qu), California bearing ratio (CBR), secant elastic modulus, and wetting-drying durability. Non-destructive tests measured shear and compression wave velocities using free-free resonance methods. Microstructural analyses revealed the formation of calcium silicate hydrate gels, which densified the matrix and strengthened interparticle bonds. The optimal 10% EA-cement mix achieved a qu of 1.2 MPa, a CBR of 47%, and increased dynamic moduli, indicating improved stiffness and strength. A strong correlation between wave velocities and strength supports non-destructive evaluation for in-situ monitoring. Economic analysis showed that stabilised sediments are 2.6 times more cost-efficient than conventional materials, mainly due to reduced transport costs. Environmental assessments confirmed material safety with minimal heavy metal leaching. Overall, EA-cement-stabilized sediments offer a sustainable, high-performance alternative for pavements, supporting eco-friendly and economical infrastructure development. © 2025 Informa UK Limited, trading as Taylor & Francis Group.
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