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Abstract:
Adaptive use of local resources of remote islands as well as reducing carbon emissions and neutralizing heavy metal ions in the road construction and operation of the islands are important for protecting island ecosystems and human health. This study innovatively developed a novel zeolite modified cement stabilized calcareous sand (Z-CSCS) material. The physicochemical properties of the Z-CSCS material were investigated using electrochemical impedance spectroscopy (EIS), unconfined compressive strength (UCS) and computer tomography (CT) tests. Furthermore, the environmental impact of the Z-CSCS material was evaluated in terms of both Pb2+ adsorption performance and a prospective life cycle assessment (LCA). The results demonstrated that zeolite could maintain its activity in Z-CSCS material under the designed mixing ratios of raw materials. The strength and porosity of Z-CSCS at 56 days decreased by 40.51 % and 82.75 %, while Pb2+ removal increased by 91.74 % at 50 % dosage of activated zeolite powder. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) analyses indicated the exchange of Ca2+ by zeolite inhibited the generation of calcium silicate hydrate (C-S-H), which weakened the connections between the components. The adsorption mechanisms of Z-CSCS on Pb2+ included cation exchange effect of zeolite and physical adsorption and chemical binding of C-S-H. Additionally, applying Z-CSCS to island pavement subgrade could significantly reduce carbon emission and energy consumption up to 54.87 % and 66.67 %, respectively. Overall, the results demonstrated the potential of applying the Z-CSCS material in the eco-construction of islands. © 2024
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Construction and Building Materials
ISSN: 0950-0618
Year: 2025
Volume: 458
7 . 4 0 0
JCR@2022
Cited Count:
SCOPUS Cited Count: 2
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 13
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