Preparation and mechanical properties of permeable concrete bricks made from reed fiber and reed fiber carbon powder for resilient cities

To investigate the mechanical performance of concrete modified by single and combined additions of reed fiber and carbon fiber powder, 100 mm cubic specimens were cast for 28-day compressive strength tests. Meanwhile, 70 mm non-standard concrete cubes were prepared to acquire failure loads. A compression testing machine was adopted to measure failure loads, and the representative compressive strength was calculated via the size conversion factor. Test results demonstrate that concrete with single carbon fiber powder achieves a 28-day compressive strength of 26.9 MPa (107.6% of the design strength). The mix with single reed fiber reaches 30.3 MPa (121.2% of the design strength). The combined addition of reed fiber and carbon fiber powder yields the optimum compressive property of 35.2 MPa (140.8% of the design strength). The hybrid fibers exert remarkable synergistic reinforcement and enhance concrete compressive capacity. Since 70 mm specimens are non-standard for concrete without unified conversion coefficients, only failure loads are recorded. This study supplies experimental support for engineering applications of green concrete modified by plant‑industrial hybrid fibers.

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