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Crack patterns in steel fiber reinforced cement paste
Abstract Fracture patterns, produced when a crack advancing from a notch in cement paste intersected a steel fiber placed perpendicular to it, were studied by SEM methods. The specimens were small notched compact tension specimens that could be wedge loaded within the scanning electron microscope chamber using a wet cell. Three distinct cracking patterns were identified. In most cases the fiber caused a shift in the crack path, accompanied by microcracking and by separation of the main crack into several branches. Observations of the surface of the groove under the steel fiber indicated that the offsetting segment of the crack path in the matrix under the fiber was tortuous, and in many cases it was characterized by branching, discontinuities, and microcracks. The microstructure of the interface region consisted of CH-rich duplex film at the actual interface, backed by a highly porous zone consisting mainly of C-S-H. The offsetting crack segments tended to damage the preexisting interface zone microstructure under the steel fibers.
Crack patterns in steel fiber reinforced cement paste
Abstract Fracture patterns, produced when a crack advancing from a notch in cement paste intersected a steel fiber placed perpendicular to it, were studied by SEM methods. The specimens were small notched compact tension specimens that could be wedge loaded within the scanning electron microscope chamber using a wet cell. Three distinct cracking patterns were identified. In most cases the fiber caused a shift in the crack path, accompanied by microcracking and by separation of the main crack into several branches. Observations of the surface of the groove under the steel fiber indicated that the offsetting segment of the crack path in the matrix under the fiber was tortuous, and in many cases it was characterized by branching, discontinuities, and microcracks. The microstructure of the interface region consisted of CH-rich duplex film at the actual interface, backed by a highly porous zone consisting mainly of C-S-H. The offsetting crack segments tended to damage the preexisting interface zone microstructure under the steel fibers.
Crack patterns in steel fiber reinforced cement paste
Bentur, A. (author) / Diamond, S. (author)
1985
Article (Journal)
English
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