Experimental study on crack propagation characteristics of steel fiber reinforced concrete for bridge engineering
To verify the new material properties obtained by adding steel fibers to reinforced concrete,the crack propagation characteristics of steel fiber reinforced concrete were studied by pouring test components of concrete materials with known parameters.A number of measuring points were selected on the poured specimen,strain gauge patches were installed,and laser displacement gauges were placed at selected positions.On the servo fatigue struc-ture testing machine,static load loading tests were carried out on concrete specimens in sequence according to the set load parameters,the disturbance degree and crack propagation law of the specimens were obtained,and the num-ber,width and length of cracks of the components were measured.The experimental results showed that after adding steel fibers to concrete components,the number of static cycles of the specimens increased.The number of cyclic forces on components with a steel fiber content of 1.5% increased by at least 451 000 times compared to those with a steel fiber content of 0.5% .The number,width,and length of cracks were significantly reduced,indicating that the addition of steel fibers can effectively enhance the crack propagation characteristics of the component.
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