Abstract:Indoor fiber pullout test and Acoustic emission (AE) test were used to explore the bonding failure mechanism of Polypropylene (PP) fiber concrete/mortar. Based on the force-displacement curves of Polypropylene (PP) fiber pullout testing, five phases in the pullout failure process of PP fiber were proposed to the pullout model: complete bonding, complete bonding to partial debonding, partial debonding to maximum debonding, maximum debonding to complete debonding and friction pullout. Acoustic emission was carried out synchronously with pullout test. Results of AE indicated that the force-displacement curves have good relativity to accumulative counts-time curves gained in synchronous acoustic testing, furthermore, the model was proven through synchronous acoustic emissions parameters.