关键词: 水泥基, 磁场, 单轴加载, 抗压强度, 磁感应强度, 电磁信号

Abstract: In order to explore the influence of iron powder，fly ash and quartz sand on the mechanical properties and magnetic field response of cement-based materials，the correlation between the compressive strength and the peak value of magnetic induction intensity of materials with different contents（5%~15%） was systematically studied by uniaxial compression test and magnetic field monitoring. The results show that the peak values of compressive strength and magnetic induction strength of iron powder and fly ash modified materials increase first and then decrease with the increase of dosage，and the peak value appears when the dosage is 10%. Quartz sand leads to a continuous decline of the both with the increase of dosage，and the performance is the best when the dosage is 5%. Linear regression analysis showed that there was a signifi⁃ cant linear positive correlation between the compressive strength and the peak magnetic induction intensity of the three materials，indicating that the microstructure and stress evolution had a regulatory effect on the mechanical-magnetic field coupling behavior. The research confirms that the magnetic field characteristics of the material failure process can characterize the mechanical degradation law，which can provide a theoret⁃ ical basis for structural health monitoring and material optimization design of multi-physical field coupling.

Key words: cement-based, magnetic field, uniaxial loading, compressive strength, magnetic induc? tion, electromagnetic signal