超低温下玄武岩纤维混凝土抗冲击性能研究  

Impact resistance of basalt fiber concrete at ultra-low temperature

作　　者：马欣 解新宇 刘润清[1] 崔云鹏[1] 耿志晨 MA Xin;XIE Xinyu;LIU Runqing;CUI Yunpeng;GENG Zhichen(School of Materials Science and Engineering,Shenyang Ligong University,Shenyang 110159,China;China Northeast Architectural Design&Research Institute Co.,Ltd.,Shenyang 110006,China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]中国建筑东北设计研究院有限公司,辽宁沈阳110006

出　　处：《混凝土》2023年第11期148-153,共6页Concrete

基　　金：国家自然科学基金面上项目(51972214)。

摘　　要：由于在低温或者超低温工作环境下,混凝土性能会产生劣化,为了增强其抗冲击性能,掺入玄武岩纤维作为增强材料,研究不同掺量的玄武岩纤维混凝土,经过3种不同温度处理(常温养护、低温以及超低温冻融循环),再利用大尺寸分离式霍普金森压杆设备对试块施加动态荷载,重点研究超低温冻融循环后的玄武岩纤维混凝土抗冲击性能。结果表明,当试块完成超低温冻融循环后,其力学性能退化比较严重,最佳纤维掺量为0.25%,从强度损失率的角度能体现纤维的优化效果;动态力学性能测试中,玄武岩纤维对混凝土在冲击作用下的破坏强度起着正向作用;玄武岩纤维增强混凝土的冲击韧性指标明显比普通混凝土要高,纤维的加入有效提升了混凝土的吸能能力。Due to the deterioration of concrete performance in low or ultra-low temperature working environments,in order to enhance its impact resistance,basalt fiber is added as a reinforcing material.Different amounts of basalt fiber concrete are studied,which are subjected to three different temperature treatments:room temperature curing,low temperature,and ultra-low temperature freeze-thaw cycles.Then,dynamic loads are applied to the test block using a large-sized separated Hopkinson compression bar equipment.Focus on the impact resistance of basalt fiber reinforced concrete after ultra-low temperature freeze-thaw cycles.The results show that after the test block completes the ultra-low temperature freeze-thaw cycle,its mechanical properties deteriorate severely,and the optimal fiber content is 0.25%,which can reflect the optimization effect of fibers from the perspective of strength loss rate.In dynamic mechanical performance testing,basalt fibers play a positive role in the failure strength of concrete under impact.The impact toughness index of basalt fiber reinforced concrete is significantly higher than that of ordinary concrete,and the addition of fibers effectively enhances the energy absorption capacity of concrete.

关 键 词：超低温 玄武岩纤维混凝土 抗冲击性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]