Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Early hydration of Portland cement studied under microgravity conditions
Graphical abstract Display Omitted
Highlights Portland cement CEM I 42.5N hydrated for 10s only. Nano-sized ettringite crystals are detected on cement surface. Ettringite growth was compared under terrestrial and micro gravity. Under microgravity, more crystals at higher aspect ratio are formed. Similar effect was observed when PCE superplasticizer was admixed.
Abstract Early ettringite formation from an industrial CEM I 42.5N hydrated for 10s at terrestrial and micro gravity conditions was studied in the presence and absence of a polycarboxylate (PCE) superplasticizer. The cement produced very tiny hexagonal ettringite crystals (l∼180nm, d∼250nm). The microgravity resulted in ∼25% more crystals at slightly higher aspect ratio (1.4 versus 0.8 at 1 g). In the presence of PCE, generally larger ettringite crystals (l∼325nm, d∼225nm) were formed. Microgravity seems to hinder the growth of ettringite on the lateral faces.
Early hydration of Portland cement studied under microgravity conditions
Graphical abstract Display Omitted
Highlights Portland cement CEM I 42.5N hydrated for 10s only. Nano-sized ettringite crystals are detected on cement surface. Ettringite growth was compared under terrestrial and micro gravity. Under microgravity, more crystals at higher aspect ratio are formed. Similar effect was observed when PCE superplasticizer was admixed.
Abstract Early ettringite formation from an industrial CEM I 42.5N hydrated for 10s at terrestrial and micro gravity conditions was studied in the presence and absence of a polycarboxylate (PCE) superplasticizer. The cement produced very tiny hexagonal ettringite crystals (l∼180nm, d∼250nm). The microgravity resulted in ∼25% more crystals at slightly higher aspect ratio (1.4 versus 0.8 at 1 g). In the presence of PCE, generally larger ettringite crystals (l∼325nm, d∼225nm) were formed. Microgravity seems to hinder the growth of ettringite on the lateral faces.
Early hydration of Portland cement studied under microgravity conditions
Meier, Markus R. (Autor:in) / Sarigaphuti, Manasit (Autor:in) / Sainamthip, Prinya (Autor:in) / Plank, Johann (Autor:in)
Construction and Building Materials ; 93 ; 877-883
01.05.2015
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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