Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Recent development of geopolymers from viewpoint of carbon dioxide emission and waste management problems
Recent trends of geopolymers have been reviewed, reffering to carbon dioxide emission and waste management problems closely rerated to COP3 and London protocol issued in 1996 and 1995, respectively. Geopolymer binders, simply called geopolymers, are based on polycondensation of [SiO4]-complexes to yield sodalite cage structures, different from Portland cements based on clinker mineral hydrations to yield insoluble hydrates. Metakaolin-potassium silicate solution or coal fly ash-sodium silicate solution system is conveniently used such ingredient mineral powders are called filler corresponding to powdered clinkers consisting of Portland cement binders simply called Portland cements. Flooding the alkali-silicate solutions to the filler, some Al(3+) as well as Si(4+) ions begin to dissolve and polycondensed [SiO4]-polymers form bridged with Al(3+) as well as Si(4+) ions. Thus, solidified monolithic bodies can be obtained by the polycondensation of matrices. Geopolymers are fire-proof up to 1000 deg C as well as light weight, bulk density is nearly 1.5 g/cm3. Specifically, metakaolin based geopolymers are applicable to vehicles, placing organic polymers even to aircrafts. Geopolymers are sulfate resistant and applications to sewage pipes as well as marine constructions are expected in a form of concrete made from coal fly ash and aggregate materials.
Recent development of geopolymers from viewpoint of carbon dioxide emission and waste management problems
Recent trends of geopolymers have been reviewed, reffering to carbon dioxide emission and waste management problems closely rerated to COP3 and London protocol issued in 1996 and 1995, respectively. Geopolymer binders, simply called geopolymers, are based on polycondensation of [SiO4]-complexes to yield sodalite cage structures, different from Portland cements based on clinker mineral hydrations to yield insoluble hydrates. Metakaolin-potassium silicate solution or coal fly ash-sodium silicate solution system is conveniently used such ingredient mineral powders are called filler corresponding to powdered clinkers consisting of Portland cement binders simply called Portland cements. Flooding the alkali-silicate solutions to the filler, some Al(3+) as well as Si(4+) ions begin to dissolve and polycondensed [SiO4]-polymers form bridged with Al(3+) as well as Si(4+) ions. Thus, solidified monolithic bodies can be obtained by the polycondensation of matrices. Geopolymers are fire-proof up to 1000 deg C as well as light weight, bulk density is nearly 1.5 g/cm3. Specifically, metakaolin based geopolymers are applicable to vehicles, placing organic polymers even to aircrafts. Geopolymers are sulfate resistant and applications to sewage pipes as well as marine constructions are expected in a form of concrete made from coal fly ash and aggregate materials.
Recent development of geopolymers from viewpoint of carbon dioxide emission and waste management problems
Kürzliche Entwicklung von Geopolymeren, ausgehend vom Standpunkt der Kohlenstoffdioxid-emission und der Probleme des Abfallmanagements
Ikeda, Ko (Autor:in) / Mikuni, Akira (Autor:in)
2006
6 Seiten, 17 Bilder, 16 Quellen
Aufsatz (Konferenz)
Englisch
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