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Published on: June 12, 2019
Behavior of volcanic ash-soil mixtures under one-dimensional compression testing
Mohammad Amin Sayyah1, Saeed Abrishami2, Pooya Dastpak3
1Department of Civil Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.
Volcanic ashes (VA) enhance clayey soil strength, significantly improving unconfined compressive strength (UCS) by up to 325% at optimal conditions. This eco-friendly additive also boosts soil
Area of Science:
- Geotechnical Engineering
- Materials Science
- Environmental Science
Background:
- Volcanic ashes (VA) are by-products of volcanic eruptions with cementitious properties.
- VA offers an eco-friendly approach to soil stabilization.
- Clayey soils often require stabilization for engineering applications.
Purpose of the Study:
- To investigate the impact of volcanic ash (VA) as an additive on clayey soil behavior.
- To evaluate the effects of VA percentage, curing conditions, and curing time on soil properties.
- To determine the optimal conditions for VA stabilization of clayey soils.
Main Methods:
- One-dimensional compression tests were performed.
- Uniaxial compression tests were conducted.
- The influence of varying VA percentages (up to 20%) and curing conditions (optimum moisture content and saturation) was analyzed.
Main Results:
- Adding VA increased unconfined compressive strength (UCS) in saturated conditions.
- A 5% VA addition at optimum moisture content (OMC) resulted in a 325% UCS improvement.
- The oedometer modulus increased with VA addition, indicating enhanced sustainability at low stress levels.
- Long-term curing promoted bond formation via pozzolanic reactions, while short-term curing showed minimal impact on consolidation parameters.
Conclusions:
- Volcanic ash is an effective eco-friendly additive for improving clayey soil strength and stiffness.
- Optimal VA content and curing conditions are crucial for maximizing soil stabilization benefits.
- Pozzolanic reactions contribute to long-term strength gains in VA-stabilized soils.
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