Mechanical and fracture mechanical properties of fine grained concrete for textile reinforced composites

The development of textile reinforced concrete (TRC), where multi-axial fabrics are used in combination with fine grained concrete, allows the design of very thin-structured concrete elements with a high strength in compression as well as tension. It is the main objective of this study to determine the mechanical and fracture mechanical characteristics of the newly developed fine grained binder systems as a main component of the composite to allow for a reliable dimensioning of TRC structures in the future. In general the serviceability of a concrete structure is defined by the loading capacity under tension and compression determined in short-term tests as well as the time-related deformations under sustained load investigated in long-term tests.In respect of short-term investigations within this work, the relevant material characteristics are determined for both compression and tension, i.e. stress-strain curves with the corresponding compressive or tensile strength and Young’s moduli are determined. A main focus of the presented investigations presented is the determination of the softening behaviour expressed by stress-crack width curves in order to define the fracture behaviour for tension. 3-point bend tests are carried out, and a newly developed analytical model is proposed which allows for the straightforward analytical derivation of a multi-linear sigma-w-relation without finite element (FE) analysis. These findings are verified by numerical simulations. Possible size effects are analysed by investigating the influence of varying specimen size and geometry in compression and tension tests.Within the scope of this study the deformation properties under sustained load are considered for compression only. Long-term tests are carried out to investigate the creep strength and creep resistance which are required for a complete dimensioning of TRC structures. Another important factor in the investigation of thin-walled structures is the influence of carbonation on the mechanical and fracture mechanical properties of fine grained concrete, because a possible strength reducing process of carbonation might be more relevant for the thin structural elements of TRC in comparison with the rather massive structures of ordinary concrete.The experimental tests within this study are carried out for static loads only - neither dynamic nor planned multi-axial loading of concrete specimens is considered within this thesis. The experimental investigations within this work are carried out for three fine grained concrete mixtures which differ in strength and hence show different fracture behaviours. Characteristic design values of fine grained concrete are provided, which allow for the dimensioning and modelling of TRC structures. Knowing the mechanical and fracture mechanical properties of the investigated concrete types ranging from a rather brittle to a ductile fracture behaviour will allow for designing further concrete mixtures with regard to requirements for each case of application of TRC building members.

Grantor dc:publisher

Mainz

Year dc:date

2006

Author dc:creator

• Brockmann, Tanja

Contributors dc:contributor

• Brameshuber, Wolfgang

• info:eu-repo/classification/ddc/620
• Mörtel
• Mechanische Eigenschaft
• Bewehrung
• Technische Textilien
• Ingenieurwissenschaften
• Beton
• Bruchmechanik
• Stoffgesetz
• Textilbewehrter Beton
• Feinbeton
• Mechanische Kennwerte
• Fracture Mechanics
• Textile Reinforced Concrete
• Fine Grained Concrete
• Mechanical Properties

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

eng

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-122970%22

OAI identifier oai:identifier

oai:publications.rwth-aachen.de:61294