【作者】 杨瑞禧； 徐钟； 周彦森； 刘兵兵； 孙晓静； 余昊龙；

【Author】 Ruixi Yang;Zhong Xu;Yansen Zhou;Bingbing Liu;Xiaojing Sun;Haolong Yu;School of Environment and Civil Engineering,Chengdu University of Technology;State Key Laboratory of Geological Hazard Prevention and Geological Environmental Protection,Chengdu University of Technology;

【机构】 成都理工大学环境与土木工程学院； 地质灾害防治与地质环境保护国家重点试验室成都理工大学；

【摘要】 利用稻壳灰和高炉矿渣为原料,设计正交试验以优化地聚物混凝土的基础配比。为进一步提升其力学性能,使用钩端钢纤维（0-0.9vol%）和纳米CaCO₃（0-2.5wt%）进行复合改性。评价了改性前后试件的抗压强度、劈裂抗拉强度以及抗落锤冲击性能。借助扫描电子显微镜（SEM）和X射线衍射仪（XRD）分析了基体的微观结构与物相成分。最后阐述了复合改性下的增强机理并讨论了造成动静态荷载下最优掺量范围差异的原因。结果表明,复合添加钩端钢纤维和纳米CaCO₃能显著提高试件的动静态力学性能。其中,抗压和劈裂抗拉强度最大提升了32.1%和91.7%,强度分别达到37.93MPa和3.95MPa;落锤冲击下试件抵抗初裂及最终破坏时的能量吸收能力最大提升了300%和333%。本试验旨在深化对纤维-纳米复合增强稻壳灰-矿渣地聚物混凝土动静态力学性能的研究,为其在实际应用中提供数据支撑,从而丰富建筑行业内绿色材料的选择范围。更多还原

【Abstract】 Rice husk ash and blast furnace slag were used as raw materials,and an orthogonal experiment was designed to optimize the material proportions.To further improve the mechanical properties of geopolymer concrete,hooked-end steel fibers(0-0.9 vol%) and nano-CaCO3(0-2.5 wt%) were used for composite modification.The compressive strength,splitting tensile strength and drop-weight impact resistance of the specimens before and after modification were evaluated.The Scanning Electron Microscopy(SEM) and X-Ray Diffraction(XRD) were used to analyzed the microstructure and phase composition of the matrix.Furthermore,the synergistic mechanism of composite modification and the reason led to the difference in optimal dosage ranges under different loads were elaborated.The results showed that the composite addition of hooked-end steel fibers and nano-CaCO3 significantly improved the static and dynamic mechanical properties of the specimens.The compressive and splitting tensile strengths increased by up to 32.1% and 91.7%,reaching 37.93 MPa and 3.95 MPa,respectively.Under drop-weight impact,the energy absorption capacity of the specimens at initial cracking and final failure increased by up to 300%and 333%,respectively.The results deepened the research on the static and dynamic mechanical properties of fiber-nanomaterial composite modified rice husk ash based geopolymer concrete,provided data support for its practical application and enriched the selection range of green material in the construction industry.更多还原