The fiber/matrix interface in fiber reinforced concrete (FRC) enhances due to the geometry of fiber surface. This work benefits from freedom of fiber engineering due to the availability of fiber production facilities. Non‐indented, indented, flat tape, and fibrillated macro polypropylene fibers were produced. The effect of fiber surface indentation and fibrillation on FRCs flexural performance was investigated. Concrete flexural strength due to the effect of fiber young modulus was found to increases by 94 and 61%, when indented and fibrillated fibers are used, respectively. The energy absorption capacity of samples containing indented and fibrillated fibers due to the effect of surface fibrillation were found to be 5.5 and 12.5 times more than that of control concrete, respectively. The mechanical performance of FRCs was modeled using finite element model. The model generated and experimental results showed acceptable compatibility. Thus, the model can be concluded to be a successful tool for prediction of FRCs flexural performance.

In this study, the influence of 3D fabric on the flexural behavior of cementitious composites has been investigated. Three 3D fabric samples were produced with different spacer yarn orientation angles of 65°, 55°, and 47°. The cementitious matrix was fabricated by cement and waste stone powder. After casting of all samples, flexural test was carried out on all specimens. Results showed that cementitious sample reinforced by 3D fabric with less spacer yarn orientation angle proposed the highest flexural strength among all samples (reinforced and unreinforced samples). Moreover, finite element method was used to predict the flexural behavior of textile reinforced concrete. Finite element method results showed good agreement with the experimental data. Consequently, the maximum spacer yarn stress derived by finite element analysis was used to calculate the efficiency reinforcement factor for all the textile reinforced concrete samples.

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In this study, stone powder as a waste material was used to fabricate cementitious composite samples. Neat (non-modified) cementitious samples were composed of gravel, cement, sand, water, and waste stone powder. Flexural and compressive strength tests showed that flexural and compressive strength could be improved by increasing waste stone powder weight percentage. In addition, the experimental results illustrated that samples containing waste stone powder present more flexural and compressive strength in comparison with those fabricated without waste stone powder at constant cement weight percentage. In the next step, polypropylene and glass fibers were used in specimens containing waste stone powder. Consequently, flexural strength of fiberreinforced composites was modeled by modifying ''Equal Cross-Section Theory.'' The results show that fibers increase flexural strength of specimens; meanwhile, waste stone powder does not have a significant effect on compressive strength. In another step, it was tried to make cementitious composite samples containing perlite as a light aggregate. Cementitious composites containing waste stone powder and perlite presented more flexural and compressive strength compared to samples without waste stone powder.