Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Zeolitic imidazolate framework nanoleaves (ZIF-L) enhancement of strength and durability of portland cement composites
Highlights ZIF-L nano-leaves slightly decrease the workability of fresh cement mix. ZIF-L enhances the early age compressive strength of cement samples. ZIF-L improves the cement resistance to water ingression and acid attack. ZIF-L delays the hydration process of OPC but increases the degree of hydration.
Abstract In this study, we discovered that the introduction of 0.5% (by weight of cement) zeolitic imidazolate framework nano-leaves (ZIF-L) into cement can modify the cement paste’s hydration and microstructure, resulting in an increase in the early compressive strength of the cement composites and improved resistance to both water ingress and acid attack. ZIF-L induced an initial set retardation effect of 1–2 h, followed by an improved degree of hydration, an effect distinct from that previously reported for mainstream nanomaterials. Based on experimental and simulation results, the retarding effect and the improved degree of hydration caused by ZIF-L were attributed to the adsorption of Ca2+ onto ZIF-L, which delayed onset of Ca(OH)2 supersaturation in the wet mix resulting in a corresponding increased solubility of silicates, respectively.
Zeolitic imidazolate framework nanoleaves (ZIF-L) enhancement of strength and durability of portland cement composites
Highlights ZIF-L nano-leaves slightly decrease the workability of fresh cement mix. ZIF-L enhances the early age compressive strength of cement samples. ZIF-L improves the cement resistance to water ingression and acid attack. ZIF-L delays the hydration process of OPC but increases the degree of hydration.
Abstract In this study, we discovered that the introduction of 0.5% (by weight of cement) zeolitic imidazolate framework nano-leaves (ZIF-L) into cement can modify the cement paste’s hydration and microstructure, resulting in an increase in the early compressive strength of the cement composites and improved resistance to both water ingress and acid attack. ZIF-L induced an initial set retardation effect of 1–2 h, followed by an improved degree of hydration, an effect distinct from that previously reported for mainstream nanomaterials. Based on experimental and simulation results, the retarding effect and the improved degree of hydration caused by ZIF-L were attributed to the adsorption of Ca2+ onto ZIF-L, which delayed onset of Ca(OH)2 supersaturation in the wet mix resulting in a corresponding increased solubility of silicates, respectively.
Zeolitic imidazolate framework nanoleaves (ZIF-L) enhancement of strength and durability of portland cement composites
Shamsaei, Ezzatollah (Autor:in) / Qing Tang, Zhao (Autor:in) / de Souza, Felipe Basquiroto (Autor:in) / Hosseini, Ehsan (Autor:in) / Benhelal, Emad (Autor:in) / Habibnejad Korayem, Asghar (Autor:in) / Duan, Wenhui (Autor:in)
10.12.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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