This paper reports on the results of X-ray imaging of steel fibre reinforced concrete in tension. The observations on fundamental behaviour and influences in the development of models for structural design are discussed. It is observed that crack paths find ways of least resistance through a section and divert around fibre ends, where possible. In
With the aim of investigating fiber orientation in ultra high performance fiber reinforced concrete (UHPFRC), a transparent model concrete containing fibers was placed in beam molds to visualize fiber orientation during placing. As a result, fibers were found to be obliquely oriented upward when the pouring position of concrete was fixed near one end of
Tension stiffening is still a matter of discussion into the scientific community. The study of this phenomenon is also relevant in structural members made of fibre reinforced concrete. This paper aims at investigating tension stiffening by presenting tension-test results on reinforced concrete prisms having different sizes, reinforcement ratios, amount of fibres and concrete strength. The
A total number of 215 structural elements were used to prepare a complete database to analyze the shear behavior and the influence of each parameter on shear out of 363 elements of the experimental database. 148 elements were eliminated for various reasons. Thus, the following items were removed: those with different failure modes to shear,
The design and building construction industry is in need of a paradigm shift. One way of dealing with this need is by exploring the use of alternative building materials, such as Textile Reinforced Concrete (TRC). TRC encompasses a fine-grained concrete matrix reinforced by multi- axial textile fabrics, which replaces the traditionally used reinforcement methods. Investigations
In this study three beams, with varying contents of steel fibre reinforcement, were tested in four point bending and compared with results from FE-analysis. The beams were part of a larger experimental programme where relevant material properties were investigated. FE-modelling was performed using a two dimensional model. Concrete was represented by four- node quadrilateral isoperimetric
This experimental investigation presents an improvement on the mechanical properties and durability of conventional concrete (CC) exposed to marine environment using synthetic fibre- concrete composites incorporating Polypropylene fibres. Conventional concrete (CC) as a reference specimen; and polypropylene fibre reinforced concrete (FRC) specimens with various proportions of polypropylene (PP) fibres were cast and exposed to simulated
This paper presents the results of an experimental study investigating the effect of un- coated polyvinyl alcohol (PVA) fibres on the properties of hardened concrete. PVA fibre of varying lengths, 6 and 12 mm and aspect ratio (l/d) of 430 and 860, respectively, was utilised in different volume fractions of 0.125%, 0.25%, and 0.5%. In
This paper presents the effect of fibres on the behaviour of fibre reinforced concert (FRC) which nowadays is recognised for its energy absorption capacity as well as other benefits. Incorporating fibres in concrete, results in an ameliorated mix design which can dissipate energy and improve the fracture performance of concrete matrix. There are different types
This paper presents the results of an experimental study and discusses the applicability of a fracture mechanics based approach to understand the stress transfer mechanism of fiber reinforced cementitious matrix (FRCM) composites externally bonded to a concrete substrate. The FRCM composite was comprised of polyparaphenylene benzobisoxazole (PBO) fibers and polymer- modified cement-based mortar. This research