Effect of Geogrid on the Structural Behavior of Reinforced Concrete Beams
Now, using of geogrids as strengthening material are extend used, especially to enhancement of concrete elements as inter layers concrete applications, eight simply supported concrete beams were tested to explain the influence of geogrid on the behavior of reinforced concrete beams. All beams have the same dimensions (100 mm x 200 mm), compressive strength (f’c = 30 MPa), span length (1150 mm), with shear reinforcement (Φ4 @100mm C/C) and tested under two point load at third span. Tested beams were divided into two groups according to presence of geogrid layer, with and without geogrid. Each group consists of four specimens, sub-divided according to flexural reinforcement ratio ranging from (0 to 0.0263). During the tests, it was found that, the load deflection curves for tested beams with geogrid layer were stiffer and the percentage of stiffening was increased when the magnitude of flexural reinforcement ratio had been increased, the maximum applied load for beams with geogrid layer was higher than conventional beams without geogrid layer at same conditions , while, the deflection values for beams with geogrid layer was lower than conventional beams without geogrid layer au same conditions. Also the load at first crack for beams with geogrid was greater than conventional beams without geogrid layer at same conditions. So the geogrid layer can be used as additional reinforcing material in reinforced concrete beams which lead to improve the concrete properties and enhanced strength resistance and reduces deflection requirement and appearing of first crack.
Keywords - Geogrid layer, load deflection response, maximum applied load, failure modes, cracks pattern