纤维改性电磁吸波集料混凝土的吸波特性和机械性能  

Wave absorption and mechanical properties of fiber-modified electromagnetic wave absorbing aggregate concrete

作　　者：朱毓豪 杨朝山 陈辉国 穆锐 曾超 任俊儒 雷屹欣 ZHU Yuhao;YANG Chaoshan;CHEN Huiguo;MU Rui;ZENG Chao;REN Junru;LEI Yixin(Army Logistics Academy,Chongqing 401331,China)

机构地区：[1]陆军勤务学院,重庆401331

出　　处：《浙江大学学报（工学版）》2024年第10期2128-2136,共9页Journal of Zhejiang University：Engineering Science

基　　金：军队后勤科研计划(BLJ22J030);重庆市研究生科研创新项目(CYS21530).

摘　　要：普通混凝土电磁防护能力弱,传统水泥基吸波材料力学性能不足、耐久性差,为此提出电磁吸波陶粒和纤维组分结合的混凝土设计方法.将碳纤维(CF)、玄武岩纤维(BF)和聚丙烯纤维(PF)作为增韧和改善混凝土电磁参数的材料,在不同纤维种类和体积掺量下,通过实验研究纤维改性电磁吸波集料混凝土的抗压强度、劈裂抗拉强度、抗折强度、抗冻性能等机械性能.实验结果表明,3种纤维均改善了电磁吸波集料混凝土的吸波特性,特别是在高频率Ku波段(12~18 GHz),当反射率小于-7 dB时,宽度大幅拓宽,反射率峰值下降明显.BF和PF显著提升了电磁吸波集料混凝土的抗压和劈裂抗拉强度,BF对早期强度贡献较大,PF在各龄期持续优化强度.3种纤维均使电磁吸波集料混凝土抗折强度较基础组提高超过50%,3种纤维均优化了电磁吸波集料混凝土抗冻性能.试件经历150次冻融循环后,较基础组减少质量损失均超过50%,相对动弹性模量提升了8%~24%.Aiming at the problems such as weak electromagnetic protection ability of ordinary concrete,insufficient mechanical properties and poor durability of traditional cement-based wave absorbing materials,a new concrete design method was proposed by combining electromagnetic wave absorbing ceramsite and functional fiber components.Carbon fiber(CF),basalt fiber(BF)and polypropylene fiber(PF)were used to toughen and optimize the electromagnetic parameters of the concrete.The electromagnetic wave absorption and the mechanical properties such as compressive strength,splitting tensile strength,flexural strength and frost resistance of electromagnetic wave absorbing aggregate concrete under different fiber types and volume contents were studied through experiments.Experimental results showed that the wave absorption of electromagnetic wave absorbing aggregate concrete was improved by adding these three fibers,especially in the higher frequency Ku band(12-18 GHz),where the bandwidth broadened greatly when the reflectivity is less than-7 dB,and the peak reflectivity decreased significantly.The compressive and splitting tensile strength of the electromagnetic wave absorbing aggregate concrete was increased distinctly by BF and PF,BF improved the early mechanical strength greatly,and PF optimized the mechanical strength at every age.All three fibers increased the flexural strength of electromagnetic wave absorbing aggregate concrete by more than 50%with the base group,and the frost resistance of the concrete was optimized by the fibers also.After 150 freeze-thaw cycles,the specimens were reduced by more than 50%compared with the base group,and the relative dynamic elastic moduli were increased by 8%-24%.

关 键 词：纤维改性 电磁吸波集料混凝土 吸波特性 机械性能 冻融循环 

分 类 号：TU599[建筑科学—建筑技术科学]