In the construction industry, which is constantly evolving and open to new technologies, concrete has been used to build constructions and has great importance, but unless enough vibration application during casting process, occur gaps between the concrete components, therefore the physical and mechanical properties of concrete cannot be forecasted accurately. Self-compacting concrete does not require vibration or compaction, it saves workmanship and time, and has high performance. Because of less workmanship and shorter production time, the self-compacting concretes offer the possibility of making the construction more economical. In this study, the flexural behavior of the reinforced concrete beams produced with self-compacting and normal concrete were investigated in terms of damage mechanics. Flexural behavior, shear capacity, energy absorption capacity and fracture type of both concrete types was investigated and results were compared. Variables of the samples are the ratio of the stirrup, and the concrete type. Totally 8 pieces of 1/2 scale beams used in this study. The specimens tested with 4-point bending test. When all the results were examined, it was observed that the beams produced with self-compacting concrete consumed more energy.
In this study, the effect of the change of stirrup ratio and polypropylene (PP) fiber ratio on the behavior of reinforced concrete beams was investigated. The variables of this study consisting of without stirrup, spacing up to 20 %, 40 % and 80 % of beam depth as stirrup spacing and 0.125 % and 0.500 % of the weight of reinforced concrete beam were used as PP fiber ratios. In the context of experimental study, 1/2 scaled 12 reinforced concrete beams were tested with 4-point bending mechanism. In the light of the obtained data, the load-displacement, stiffness and energy absorption graphs were plotted. The results were interpreted comparatively. According to the results, it is observed that the PP fiber additive significantly changed the behavior of the reinforced concrete beams, and the fiber effect decreased in proportion to the increase of the stirrup rate. It has been observed that the cracks spread more to the beam surfaces with the increase of PP fibers. In addition, the increase in the fiber ratio especially in the non-stirrup beams increases the bending capacity.
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