纤维含量和几何尺寸对玄武岩纤维增强混凝土耐久性能的影响研究  

Study on Effect of Fiber Content and Physical Dimension on Durability of Basalt Fiber-reinforced Concrete

作　　者：杨立君 李烨 魏云龙 YANG Lijun;LI Ye;WEI Yunlong

机构地区：[1]山东高速河南发展有限公司,河南许昌461000 [2]山东高速集团河南许禹公路有限公司,河南许昌461000

出　　处：《城市道桥与防洪》2024年第11期233-236,241,M0022,M0023,共7页Urban Roads Bridges & Flood Control

摘　　要：氯离子侵蚀是钢筋混凝土结构长期性能退化的主要原因,其与保护层抗渗性和抗拉性能密切相关,为提高混凝土的耐久性本研究开展了玄武岩纤维增强混凝土快速氯离子侵蚀试验及劈裂抗拉强度试验,通过分析不同纤维含量、长度下的玄武岩纤维增强混凝土的性能,确定混凝土抗氯离子渗透性能和劈裂抗拉性能提升的最优纤维掺量和几何尺寸。结果表明:加入0.1%的长度为9 mm纤维且长径比在529∶1左右时,短切玄武岩纤维对混凝土的抗氯离子渗透能力和劈裂抗拉强度均有显著提升;纤维的桥联作用改善了混凝土的破坏行为提高了混凝土的抗拉强度,同时由于纤维的不透水性,使得氯离子传输路径受阻以及改善混凝土内孔隙率,使得混凝土抗渗性提高。Chloride ion erosion is the main cause of long-term performance degradation of reinforced concrete structures,which is closely related to the impermeability and tensile properties of the protective layer.In order to improve the durability of concrete,the basalt fiber reinforced concrete rapid chloride ion erosion test and the splitting tensile strength test are carried out.Through the analysis of the performances of basalt fiber reinforced concrete with different fiber contents and lengths,the optimal fiber content and the physical dimension to improve the chlorine ion penetration resistance and the splitting tensile property of the concrete are determined.The results show that when 0.1%of 9 mm-long fiber is added and the length-to-diameter ratio is about 529∶1,the short-cut basalt fiber will significantly improve the chlorine ion penetration resistance and the splitting tensile strength of the concrete.The bridging effect of the fiber improves the destructive behavior of the concrete and increases the tensile strength of the concrete.And at the same time, the impermeability of the fibers makes the chlorine ion transmission path blocked, which improves the porosity within the concrete, and makes the concrete anti-permeability improved.

关 键 词：混凝土保护层 耐久性 玄武岩纤维 氯离子扩散系数 抗拉强度 

分 类 号：U414[交通运输工程—道路与铁道工程]