Study of the Failure Mechanism of Mortar Rubble Using Digital Image Correlation, Acoustic Emission and Scanning Electron Microscopy

This paper describes an extensive experimental study of the compressive failure different types aggregates and influence aggregate type on interfacial properties mortars. Interfacial debonding was main mode mortar rubbles. The interlocking strength strongly affected materials. When basalt used as aggregate, I-II composite deflection crack occurred well debonding. highest instantaneous AE energy granite rubble 1349 mV·ms, which 4.1 times greater than that (326 mV·ms). Acoustic emissions were strongest in 150–220 kHz range gave early warning damage load at high frequencies (160–320 kHz). C-S-H gel formed by hydration reaction adhered to pores exhibited a “root pile” effect improved bonding performance zone. porosity basalt, limestone 21.29%, 18.70% 30.0%, respectively. interface has large porosity, fractal cones small (1.19), there obvious sidewall effect, but weak. pore structure had significant bond strength. multi-faceted analysis truly reflected state evolution rubbles, results very effective for determining mechanical