Document Type : Research articles
Authors
1
Professor of Reinforced Concrete Structures, Civil Eng. Dep., Shoubra Faculty of Eng/ Benha University, Egypt
2
Lecturer, Construction Engineering Department, The Higher Institute of Eng/ 6th of October City, Egypt
3
Construction Engineering Department, The Higher Institute of Eng/ 6th of October City, Egypt
Abstract
Geogrids are categorized as one of the geosynthetics materials that are used for soil stabilization and reinforcing of
earth structures such as earth walls and dams. This research investigated the effect of using uniaxial geogrids as
additional reinforcement, in addition to, steel fibers in the concrete mix, on the flexural behavior of beams. The
experimental research work comprised of testing thirteen simply supported reinforced concrete (R.C) beams which
were tested up to failure under four-point loading. The variables of this study are: the volume of steel fibers (0.0,
0.5, 1.0 %), number of geogrid layers (one, two, and three layers), the shape of the geogrid layers, and the
longitudinal reinforcement percentage. The mid-span deflection, failure loads, ductility, crack patterns, steel,
concrete and Geogrid strains of the beams were reported and compared. The test results concluded that the addition
of Geogrid layers as a reinforcing technique proved to be an effective tool to improve the flexural behavior of R.C
beams and improve the cracking patterns. The number of geogrid layers used in the beams plays a significant effect
in increasing the failure loads and decreasing the deflections of the beams. The addition of steel fibers in R.C
beams, in addition to, Geogrid layers increases the cracking loads, failure loads and reduces the deflection of beams
at failure loads. Increasing the fiber content from (0.5%) to (1%) had a slight effect on increasing the maximum
carrying capacities of the beams. Addition of U-shaped Geogrid layers had a considerable effect on increasing the
failure loads rather than the addition of Geogrid layers in the tension zone only
Keywords
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