摘要
为探究纤维增强炉渣混凝土在寒区工程中的可行性,并确定最优剑麻纤维掺量和炉渣最优替代率,本文研究了冻融循环作用下纤维增强炉渣混凝土的力学特性和微观结构。结果表明,冻融循环作用下炉渣替代混凝土中的细骨料具有潜在应用价值,剑麻纤维对混凝土力学性能有显著增强作用。冻融循环作用下,混凝土的抗压强度随着炉渣替代率的增加先增大后减小,炉渣替代率为13.2%~26.4%时混凝土的抗压强度最高,为40.9 MPa。炉渣替代率超过39.6%时,混凝土的抗压强度下降趋势明显且质量损失较大。加入剑麻纤维能显著提升混凝土的抗压强度,120次冻融循环后,添加1 kg·m^(-3)剑麻纤维的混凝土表现出最高的抗压强度及最低的强度损失率,其强度及强度损失率分别为36.1 MPa和10.2%。此外,添加2 kg·m^(-3)剑麻纤维的混凝土表现出了最低的质量损失。微细观结果表明冻融循环会导致混凝土表面和内部损伤,影响水化反应,降低混凝土的耐久性能。
To explore the feasibility of fiber-reinforced slag concrete in cold-region engineering and determine the optimal sisal fiber content and slag replacement ratio,this study investigated the mechanical properties and microstructure of fiber-reinforced slag concrete under freeze-thaw cycles.The results showed that replacing fine aggregates with slag in concrete had potential application value under freeze-thaw cycles,and sisal fiber signifi⁃cantly enhanced the mechanical properties of concrete.Under freeze-thaw cycles,the compressive strength of concrete initially increased and then decreased with the increase in slag replacement ratio,reaching a maximum of 40.9 MPa at a replacement ratio between 13.2%and 26.4%.When the slag replacement ratio exceeded 39.6%,the compressive strength of concrete declined significantly,accompanied by substantial mass loss.The incorporation of sisal fiber markedly improved the compressive strength of concrete.After 120 freeze-thaw cy⁃cles,the concrete with 1 kg·m^(-3)sisal fiber exhibited the highest compressive strength and the lowest strength loss rate,with values of 36.1 MPa and 10.2%,respectively.Additionally,the concrete with 2 kg·m^(-3)sisal fi⁃ber demonstrated the lowest mass loss.Microscopic analysis revealed that freeze-thaw cycles caused surface and internal damage in concrete,affecting hydration reactions and reducing concrete durability.
作者
罗诗浩
高佳佳
路建国
李华东
邓菲
LUO Shihao;GAO Jiajia;LU Jianguo;LI Huadong;DENG Fei(School of Civil Engineering and Geomatics,Southwest Petroleum University,Chengdu 610500,China;School of Mechanical and Electrical Engineering,Southwest Petroleum University,Chengdu 610500,China;Laboratory and Equipment Management Office(Analytical Testing Center),Southwest Petroleum University,Chengdu 610500,China;School of Architecture and Civil Engineering,Xihua University,Chengdu 610039,China)
出处
《冰川冻土》
2025年第4期940-950,共11页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(42101136)
四川省科技计划项目(2024NSFSC2007,2025YFHZ0273)
西南石油大学自然科学“启航计划”项目(2024QHZ029)资助。
关键词
炉渣混凝土
剑麻纤维
冻融循环
力学性能
微观结构
slag concrete
sisal fiber
freeze-thaw cycles
mechanical properties
microstructure
