Acoustic emission analysis of polypropylene plastic concrete based on three-point bending test
To investigate the effect of adding polypropylene(PP)plastic particles on fatigue damage of con-crete,a series of three-point bending fatigue tests were conducted using acoustic emission(AE)technology with different plastic particle dosages of Wf(0,10％,and 20％)in concrete.The experimental results show that after adding plastic particles,the fatigue life of concrete increases,the fracture energy increases,and the maximum load that the specimen can withstand decreases,but the deflection increases and the plastic deformation ability enhances;The damage sources of AE localization are mainly concentrated in the mid span area.Before the first peak load,there are fewer AE events,and there are fewer fatigue damage points inside the concrete that can be identified by AE localization.As the fatigue failure stage approaches,the number of AE signal sources increases sharply,and as Wf increases,the number of AE events is significantly lower;AE events mainly occur at the trough of cyclic loading.After adding plastic particles,the number of AE signals significantly decreases and the duration is shorter.Moreover,with the increase of Wf,the number of AE signals further decreases.The addition of PP plastic particles helps to alleviate the fatigue damage of concrete and prolong its fatigue life.
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