Abstract:
The acoustic emission (AE) method was employed to observe the generation and accumulation of microcracks when locally hitting the surface of a heated cement stone CK M400 prepared with the aging. The experiments were carried out at temperatures of 0$^\circ$C, 200$^\circ$C and 400$^\circ$C. The last of these temperatures is ultimate for recovery of the mechanical properties of cement stone after a cycle of heating. The AE sweep amplitudes were analyzed and matched with the progressive processes of material transformation; those are the plastic deformation, fracture of interpore walls by heated vapor, accumulation of microcracks when exceeding the impact strength of the cement stone.
Keywords:cement stone, impact damage, acoustic emission, temperature effect.
Fulltext:
PDF file (320 kB)