TY - JOUR
T1 - Enhancing the chloride ion penetration resistance of concrete using metal-organic frameworks
AU - El-Hassan, Hilal
AU - El-Dieb, Amr
AU - El-Mir, Abdulkader
AU - Alzamly, Ahmed
AU - Aly Hassan, Ashraf
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2024/12
Y1 - 2024/12
N2 - This study focuses on a novel technique to improve the resistance of cement-based concrete to chloride ion penetration by incorporating NH2-MIL-125(Ti) metal-organic frameworks (MOF) into the mix. The MOF was produced and assessed against its chloride adsorption capacity. Subsequently, it was added to cement-based concrete in proportions of 1 %, 3 %, and 5 %, by cement mass. The effect of incorporating MOF on the concrete resistance to chloride penetration, reaction kinetics, and compressive strength was investigated. The experimental results revealed that the NH2-MIL-125 (Ti) MOF effectively removed/adsorbed the chloride ions from sodium chloride solutions, with a maximum removal capacity of 31.5 % after 7 days of exposure. Furthermore, the depth and rate of chloride ion penetration into the concrete were reduced as the mass of MOF incorporated into the concrete mix increased. Yet, the efficiency of the MOF to reduce chloride penetration decreased over time, owing to its saturation by continuous exposure to chloride ions. Furthermore, the addition of up to 5 % MOF, by cement mass, had a limited impact (<10 %) on the concrete compressive strength but did not affect the hydration reaction. Owing to its small particle size, MOF strengthened the cement paste by reducing the volume of permeable voids. Such research findings highlight that MOF could be added to cement-based concrete to enhance its resistance to chloride ingress without significantly impacting its compressive strength. This novel approach can effectively impede chloride penetration, thereby delaying corrosion and extending the service life of concrete structures.
AB - This study focuses on a novel technique to improve the resistance of cement-based concrete to chloride ion penetration by incorporating NH2-MIL-125(Ti) metal-organic frameworks (MOF) into the mix. The MOF was produced and assessed against its chloride adsorption capacity. Subsequently, it was added to cement-based concrete in proportions of 1 %, 3 %, and 5 %, by cement mass. The effect of incorporating MOF on the concrete resistance to chloride penetration, reaction kinetics, and compressive strength was investigated. The experimental results revealed that the NH2-MIL-125 (Ti) MOF effectively removed/adsorbed the chloride ions from sodium chloride solutions, with a maximum removal capacity of 31.5 % after 7 days of exposure. Furthermore, the depth and rate of chloride ion penetration into the concrete were reduced as the mass of MOF incorporated into the concrete mix increased. Yet, the efficiency of the MOF to reduce chloride penetration decreased over time, owing to its saturation by continuous exposure to chloride ions. Furthermore, the addition of up to 5 % MOF, by cement mass, had a limited impact (<10 %) on the concrete compressive strength but did not affect the hydration reaction. Owing to its small particle size, MOF strengthened the cement paste by reducing the volume of permeable voids. Such research findings highlight that MOF could be added to cement-based concrete to enhance its resistance to chloride ingress without significantly impacting its compressive strength. This novel approach can effectively impede chloride penetration, thereby delaying corrosion and extending the service life of concrete structures.
KW - Chloride
KW - Compressive strength
KW - Concrete
KW - Corrosion
KW - Metal–organic frameworks
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U2 - 10.1016/j.cscm.2024.e03463
DO - 10.1016/j.cscm.2024.e03463
M3 - Article
AN - SCOPUS:85196845970
SN - 2214-5095
VL - 21
JO - Case Studies in Construction Materials
JF - Case Studies in Construction Materials
M1 - e03463
ER -