Effect of modified recycled PP plastic particles on bending performance of concrete⁃notched beams

doi:10.19491/j.issn.1001-9278.2025.04.016

Abstract

Abstract:

To investigate the effect of plastic particles on the bending characteristics and fracture damage behavior of concrete， three⁃point bending fatigue fracture tests were conducted on the modified recycled polypropylene （PP） plastic particle concretes used for the concrete notched beams. The experimental results indicated that the load crack opening displacement curve of plastic particle concretes presented a single peak shape. With the addition of PP plastic particles， there is no change in the crack opening displacement. However， the downward section of the curve descended significantly， and the fatigue failure ductility of concrete was enhanced. The appropriate addition of PP plastic particles can effectively alleviate the fatigue damage of concrete； The shape of plastic particles has a significant impact on the fatigue performance of concrete. Short columnar PP particles play a bridging role in the tension， improving the toughness and deformation resistance of concrete. There is an increase in the fracture energy and energy absorption capacity of concrete after addition of PP plastic particles. This results in a significant extension in the fatigue life.

Key words: polypropylene plastic particles, concrete, cutting beam bending, damage crack, bending fracture characteristics

CLC Number:

TQ325.1⁺4

LI Jing, XIAO Dong, HE Yu, DAI Zaibo. Effect of modified recycled PP plastic particles on bending performance of concrete⁃notched beams[J]. China Plastics, 2025, 39(4): 92-96.

Figures/Tables 8

试件编号	水泥含量	粉煤灰含量	碎石含量	细骨料含量		水含量	减水剂含量
试件编号	水泥含量	粉煤灰含量	碎石含量	砂子	塑料颗粒	水含量	减水剂含量
PC0	21.65	8.55	43.65	54.32	0	11.64	0.45
PC10	21.65	8.55	43.65	48.80	5.45	11.64	0.45
PC20	21.65	8.55	43.65	43.44	10.90	11.64	0.45
PC30	21.65	8.55	43.65	37.92	16.35	11.64	0.45

Tab.1. Mix proportion of concrete specimens mixed with PP particles

Fig.1. Main test and material parameter statistical results of plastic particle concrete

Fig.2. P⁃δ curves of concrete specimens with different dosages of PP particles

Fig.3. P⁃CMOD curves of concrete specimens with different dosages of PP particles

Fig.4. Variation curve of maximum crack length with cyclic loading in concrete mixed with PP particles

Fig.5. The variation curve of damage variables of PP particle concrete specimens with different dosages during cyclic loading process

Fig.6. Load deflection curves of PP particle concrete specimens with different dosages

Fig.7. The variation curve of fracture energy of PP particle concrete specimens with different dosages during cyclic loading process

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