A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A sustainable landfill liner material: clay-fly ash geopolymers
https://orcid.org/0000-0002-7950-322X
Abstract Geopolymers offer a number of benefits, including high sorption capacity, sufficient durability, and substantial mechanical strength as well as low $ CO_{2} $ emission and limited drying shrinkage, which may make them sustainable candidates to be utilized as landfill liner materials. Hence, this research is aimed at evaluating how a clay-fly ash geopolymer can meet the requirements proposed for mineral liners so as to compensate for the scarcity of suitable local clay. In this study, clay-fly ash geopolymers are synthesized from the mixtures containing 60% fly ash to the total solid mass and then activated by 10 M NaOH solutions. Several experiments are conducted to assess the mechanical strength, permeability, durability, and sorption capacity of the proposed liner material. Results depict that geopolymerzation has led to a prominent alteration in clay structure, contributing to a non-plastic soil with lower swelling potential and desiccation cracking probability. Proven to enhance sorption capacity and resist freeze-thaw cycles, the clay-fly ash geopolymers are shown to satisfy the criteria of volume shrinkage < 4%, permeability ≤ 1×$ 10^{−7} $ cm/s, unconfined compressive strength > 200 kPa, and plasticity index < 7–10. Microstructural analyses also corroborate that the binding agents result in the formation of coagulated particles covered by aluminosilicate gels, thus rendering a more sustainable material. Additionally, the sorption capacity of the clay-fly ash geopolymers exposed to freeze-thaw cycles also shows comparable values to the unexposed specimens.
A sustainable landfill liner material: clay-fly ash geopolymers
https://orcid.org/0000-0002-7950-322X
Abstract Geopolymers offer a number of benefits, including high sorption capacity, sufficient durability, and substantial mechanical strength as well as low $ CO_{2} $ emission and limited drying shrinkage, which may make them sustainable candidates to be utilized as landfill liner materials. Hence, this research is aimed at evaluating how a clay-fly ash geopolymer can meet the requirements proposed for mineral liners so as to compensate for the scarcity of suitable local clay. In this study, clay-fly ash geopolymers are synthesized from the mixtures containing 60% fly ash to the total solid mass and then activated by 10 M NaOH solutions. Several experiments are conducted to assess the mechanical strength, permeability, durability, and sorption capacity of the proposed liner material. Results depict that geopolymerzation has led to a prominent alteration in clay structure, contributing to a non-plastic soil with lower swelling potential and desiccation cracking probability. Proven to enhance sorption capacity and resist freeze-thaw cycles, the clay-fly ash geopolymers are shown to satisfy the criteria of volume shrinkage < 4%, permeability ≤ 1×$ 10^{−7} $ cm/s, unconfined compressive strength > 200 kPa, and plasticity index < 7–10. Microstructural analyses also corroborate that the binding agents result in the formation of coagulated particles covered by aluminosilicate gels, thus rendering a more sustainable material. Additionally, the sorption capacity of the clay-fly ash geopolymers exposed to freeze-thaw cycles also shows comparable values to the unexposed specimens.
A sustainable landfill liner material: clay-fly ash geopolymers
https://orcid.org/0000-0002-7950-322X
Abstract Geopolymers offer a number of benefits, including high sorption capacity, sufficient durability, and substantial mechanical strength as well as low $ CO_{2} $ emission and limited drying shrinkage, which may make them sustainable candidates to be utilized as landfill liner materials. Hence, this research is aimed at evaluating how a clay-fly ash geopolymer can meet the requirements proposed for mineral liners so as to compensate for the scarcity of suitable local clay. In this study, clay-fly ash geopolymers are synthesized from the mixtures containing 60% fly ash to the total solid mass and then activated by 10 M NaOH solutions. Several experiments are conducted to assess the mechanical strength, permeability, durability, and sorption capacity of the proposed liner material. Results depict that geopolymerzation has led to a prominent alteration in clay structure, contributing to a non-plastic soil with lower swelling potential and desiccation cracking probability. Proven to enhance sorption capacity and resist freeze-thaw cycles, the clay-fly ash geopolymers are shown to satisfy the criteria of volume shrinkage < 4%, permeability ≤ 1×$ 10^{−7} $ cm/s, unconfined compressive strength > 200 kPa, and plasticity index < 7–10. Microstructural analyses also corroborate that the binding agents result in the formation of coagulated particles covered by aluminosilicate gels, thus rendering a more sustainable material. Additionally, the sorption capacity of the clay-fly ash geopolymers exposed to freeze-thaw cycles also shows comparable values to the unexposed specimens.
A sustainable landfill liner material: clay-fly ash geopolymers
Khaksar Najafi, Elmira (author) / Jamshidi Chenari, Reza (author) / Payan, Meghdad (author) / Arabani, Mahyar (author)
2021
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
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