Abstract
Fiber-reinforced concretes (FRCs) offer significant improvements in tensile strength and durability compared to most other concrete mixes. However, for safe and efficient use of FRC in large structures, anisotropy of fiber orientation needs to be understood and properly controlled. In this project, both cored samples extracted from a FRC slab and FRC samples cast individually in molds were assessed using X-ray computed tomography (CT) and measurements of fiber orientation were extracted from the resulting CT images. These results showed that fibers within the slab were highly anisotropic in orientation while fibers in individually cast samples showed a much more heterogeneous distribution of orientations. This indicates that fiber orientation is highly dependent on the casting process and suggests that FRC can only be safely and efficiently utilized if anisotropic fiber orientation is properly accounted for during design and optimized casting methods are used during construction.
Highlights
IntroductionSignificant elongation is needed for steel reinforcing bars to carry substantial tensile loads within concrete components
1.1 Structural use of Fiber-reinforced concretes (FRCs)Significant elongation is needed for steel reinforcing bars to carry substantial tensile loads within concrete components
The precise implementation of this method for concrete materials as well as the development of an accurate algorithm for measuring quantitative crack orientation properties should enable statistical analysis of this phenomenon. These experiments demonstrated the value of X-ray computed tomography (CT) for evaluating the internal structure of FRC samples
Summary
Significant elongation is needed for steel reinforcing bars to carry substantial tensile loads within concrete components. This elongation results in the formation of cracks in the surrounding concrete material and, if these cracks are wide, they can be unsightly and can lead to durability problems through the movement of chlorides causing corrosion to the steel reinforcing bars. Its use in structural members, such as in beams and columns, has shown that great ductility can be achieved with cracks that are barely visible to the naked eye [2]. While these characteristics have enormous potential, their promise has not yet been fully realized
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