掺功能材料水泥基材料电性能和磁性能的研究

发布时间：2018-04-26 18:19

  本文选题：功能材料 + 电性能　； 参考：《南京航空航天大学》2013年硕士论文

【摘要】：掺功能材料制备的水泥基材料在道路融冰化雪、建筑采暖和屏蔽以及机场跑道吸波等方面的应用将会带来巨大的社会和经济效益。本文研究了掺功能材料水泥基材料的电性能和磁性能，具体研究内容和结论如下： 研究了各因素对掺功能材料水泥基材料导电性能的影响：水泥净浆的电阻率会随功能材料C掺量和长度的增加而降低，功能材料C的渗流阈值约为1%；功能材料B在0.25%掺量时净浆电阻率下降明显，继续增加掺量在小于4%时电阻率降低幅度较小；纳米材料F具有较高的磁导率，会降低净浆的电阻率；纳米材料N和C分别具有空穴导电特性和气敏性，能够降低净浆的电阻率；纳米材料T掺入净浆中对水泥净浆电阻率降低幅度较小。按体积比例在砂浆中掺入功能材料C，砂浆的电阻率会随砂胶比增加而增大，随水灰比的增加而降低。 通过正交实验研究了水灰比、功能材料C和B的掺量对混凝土导电性能、力学性能的影响，最后确定混凝土最优组分为：水灰比0.44，功能材料C19.09g，功能材料B38.16g。测试了长期通电条件下混凝土温度和电阻率的变化，混凝土的温度会随着通电时间的增加而呈现先上升后下降的趋势，，电阻率则单调增加。 研究了掺功能材料水泥基吸波材料的吸波性能与力学性能。双层水泥基吸波板的反射率在2-18GHz频率范围内均低于-5.4dB，小于-10dB的有效带宽为3.7GHz；三层水泥基吸波板的反射率均低于-5.9dB，小于-10dB的有效带宽为10.8GHz。分别测试了双层吸波板和三层吸波板各层及整体的7d和28d抗压强度。对双层吸波材料的上层和下层进行了SEM和EDS分析。 运用有限元模拟了初始温度及环境温度为-15℃、输入电压50V、电阻率为455导电混凝土在底部绝热条件下的融冰过程，在5270s时冰层完全融化；通过能量守恒计算融冰时间为5244s，实验测试融冰时间为6000s。
[Abstract]:The application of cement-based materials mixed with functional materials in road ice melting snow building heating and shielding and airport runway absorbing will bring great social and economic benefits. In this paper, the electrical and magnetic properties of cement-based materials doped with functional materials are studied. The specific contents and conclusions are as follows: The effects of various factors on the electrical conductivity of cement-based materials doped with functional materials are studied. The resistivity of cement paste decreases with the increase of C content and length of functional materials. The percolation threshold of functional material C is about 1: 1, the net slurry resistivity of functional material B decreases obviously when the content of material B is 0.25%, the decrease of resistivity decreases slightly when the content of functional material B is less than 4, and the permeability of nano-material F is higher. Nanomaterials N and C have hole conductivity and gas sensitivity respectively, which can reduce the resistivity of paste. The resistivity of mortar increases with the increase of the ratio of sand to cement and decreases with the increase of water / cement ratio when the functional material C is added into the mortar according to the volume ratio. The effects of water-cement ratio and the content of C and B on the conductivity and mechanical properties of concrete were studied by orthogonal experiment. The optimum composition of concrete was determined as follows: water-cement ratio 0.44, functional material C 19.09 g, functional material B38.16g. The change of temperature and resistivity of concrete under the condition of long term electrification is tested. The temperature of concrete will rise first and then decrease with the increase of electrification time, but the resistivity will increase monotonously. The absorbing and mechanical properties of cement based absorbing materials were studied. The reflectivity of the double-layer cement based absorbing plate is lower than -5.4 dB and the effective bandwidth less than -10 dB is 3.7 GHz in the 2-18GHz frequency range, and the reflectivity of the three-layer cement based absorbing plate is less than -5.9 dB, and the effective bandwidth less than -10 dB is 10.8 GHz. The compressive strength of the bilayer absorbing plate and the three-layer absorbing plate were measured for 7 days and 28 days, respectively. The upper and lower layers of bilayer absorbing materials were analyzed by SEM and EDS. The melting process of initial temperature and ambient temperature of -15 鈩

本文编号：1807120