Nan Bo, Xin Jiantong, Yu Wei
College of Water Conservancy, Shenyang Agricultural University, Shenyang 110866, China.
Materials (Basel). 2025 May 27;18(11):2531. doi: 10.3390/ma18112531.
This study systematically investigates the effects of the desert sand replacement ratio (DSRR) and the incorporation of individual fiber types such as steel fibers, polypropylene fibers, and basalt fibers, as well as various hybrid fiber combinations, on the workability, mechanical properties, and microstructure of fiber-reinforced desert sand concrete (FRDSC). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) assessed hydration byproducts and elucidated the material's toughening mechanisms. The optimal compressive strength occurs at 40% DSRR; further increases in the replacement ratio lead to a decline in performance. At this optimal DSRR, the addition of 0.5% steel fibers by volume results in a 27.6% increase in the compressive strength of the specimens. Moreover, the splitting tensile strength of specimens reinforced with a hybrid combination of basalt fibers and polypropylene fibers increased by 9.7% compared to those reinforced with basalt fibers alone. Microstructural observations reveal that fiber bridging promotes denser calcium silicate hydrate (C-S-H) gel development. These findings underscore the promising viability of FRDSC as a sustainable construction material, particularly for infrastructure projects in desert regions, offering both environmental and economic advantages.
本研究系统地研究了沙漠砂替代率（DSRR）、钢纤维、聚丙烯纤维和玄武岩纤维等单一纤维类型的掺入以及各种混杂纤维组合对纤维增强沙漠砂混凝土（FRDSC）的工作性能、力学性能和微观结构的影响。扫描电子显微镜（SEM）和X射线衍射（XRD）评估了水化副产物并阐明了材料的增韧机制。最佳抗压强度出现在DSRR为40%时；替代率的进一步增加会导致性能下降。在这个最佳DSRR下，按体积添加0.5%的钢纤维会使试件的抗压强度提高27.6%。此外，与仅用玄武岩纤维增强的试件相比，用玄武岩纤维和聚丙烯纤维的混杂组合增强的试件的劈裂抗拉强度提高了9.7%。微观结构观察表明，纤维桥接促进了更致密的硅酸钙水化物（C-S-H）凝胶的形成。这些发现强调了FRDSC作为一种可持续建筑材料的前景，特别是对于沙漠地区的基础设施项目，具有环境和经济优势。
