Abstract:To investigate the relationship between the acoustic emission characteristics of the damage of concrete and its constituent materials, uniaxial compression tests on concrete and its constituent materials (cement mortar and limestone) were carried out and the acoustic emission characteristics of the three during the damage process were statistically analysed. The results show that the peak frequency and amplitude of the acoustic emission signals from all three specimens increase at the time of imminent damage. The frequency distribution of all three shows a normal distribution, with the largest proportion in the 90-120 kHz range. Dynamic b-value trends for cement mortar and concrete do not fluctuate much and remain at a relatively high value range, The dynamic b-value of limestone shows a trend of increasing first and then decreasing, and decreases rapidly near the peak stress, indicating the coming of main fracture. The overall b-value and peak frequency distribution of concrete are between limestone and cement mortar, The overall b-value of cement mortar mixed with limestone is close to that of concrete, this reflects the superposition effect of acoustic emission characteristics of the failure of concrete and its constituent materials.