Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Grundlagen und Anwendung von ultra-hochfestem Faserbeton für dünne Schichten
Although ultra-high performance concrete (UHPC) is a promising construction material with outstanding mechanical properties, the utilisation of this high efficient material in practice is still in the beginning. A main reason for this circumstance is the leak of material models to describe the time dependant development of mechanical properties and deformations due to creep and shrinkage. The main results of the german research work are summerised in the "Sachstandsbericht Ultrahochfester Beton" edited by the Deutscher Ausschuss für Stahlbeton" (DAfStb) which contains a collection of test results but no regulations or calculation methods. When applied into practice, UHPC is usually used for high load carrying constructions with small cross sections due to its high compressive and tensile strength. Besides the high strength UHPC is also characterised by outstanding properties concerning durability and impermeability against fluids and gases. These key benefits predestine UHPC especially for maintenance and rehabilitation methods in order to improve the durability of older concrete structures. A possible application method is the usage of floating and self-compacting UHCP mixtures as a 2 - 5 cm thin protection layer. In this case the UHPC hardens in thermal and mechanical bond with older concrete structures. In the first part of this thesis it is shown, that existing approaches to calculate mechanical properties or shrinkage deformations, valid for high performance concrete or normal strength concrete, may be adapted on UHPC. These approaches are often described as a function of the degree of hydration a or the equivilant age te. A significant difference is the progress of hardening and the development of mechanical properties due to the low water-cementratio, which is typical for UHPC. Such low water-cement ratios cause an incomplete hydration, which is considered by means of a limited ultimate degree of hydration αU In fact that UHPC is suitable for 2 - 5 cm thin protection layers, in the second part of this thesis a comprehensive test series was carried out to detect the heat development in construction elements and the hardening in bond with older concrete structures.
Grundlagen und Anwendung von ultra-hochfestem Faserbeton für dünne Schichten
Although ultra-high performance concrete (UHPC) is a promising construction material with outstanding mechanical properties, the utilisation of this high efficient material in practice is still in the beginning. A main reason for this circumstance is the leak of material models to describe the time dependant development of mechanical properties and deformations due to creep and shrinkage. The main results of the german research work are summerised in the "Sachstandsbericht Ultrahochfester Beton" edited by the Deutscher Ausschuss für Stahlbeton" (DAfStb) which contains a collection of test results but no regulations or calculation methods. When applied into practice, UHPC is usually used for high load carrying constructions with small cross sections due to its high compressive and tensile strength. Besides the high strength UHPC is also characterised by outstanding properties concerning durability and impermeability against fluids and gases. These key benefits predestine UHPC especially for maintenance and rehabilitation methods in order to improve the durability of older concrete structures. A possible application method is the usage of floating and self-compacting UHCP mixtures as a 2 - 5 cm thin protection layer. In this case the UHPC hardens in thermal and mechanical bond with older concrete structures. In the first part of this thesis it is shown, that existing approaches to calculate mechanical properties or shrinkage deformations, valid for high performance concrete or normal strength concrete, may be adapted on UHPC. These approaches are often described as a function of the degree of hydration a or the equivilant age te. A significant difference is the progress of hardening and the development of mechanical properties due to the low water-cementratio, which is typical for UHPC. Such low water-cement ratios cause an incomplete hydration, which is considered by means of a limited ultimate degree of hydration αU In fact that UHPC is suitable for 2 - 5 cm thin protection layers, in the second part of this thesis a comprehensive test series was carried out to detect the heat development in construction elements and the hardening in bond with older concrete structures.
Grundlagen und Anwendung von ultra-hochfestem Faserbeton für dünne Schichten
Ewert, Jens (Autor:in)
2014
152 Seiten, Bilder, Tabellen, 95 Quellen
Hochschulschrift
Deutsch
Grundlagen und Anwendung von ultra-hochfestem Faserbeton für dünne Schichten
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