Fracture behavior of polypropylene fiber reinforced concrete modified by rubber powder exposed to elevated temperatures

Zhou, Wenmei; Mo, Jinxu; Zeng, Lei; Xiang, Sheng

doi:10.1016/j.conbuildmat.2022.128439

Cited by 20 publications

(3 citation statements)

References 56 publications

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“…The initial fracture toughness K ini IC of concrete is the boundary value of the stress intensity factor K I when the crack at the incision of the concrete prism expands, which indicates the ability of concrete to resist crack propagation. The calculation formula of the initial fracture toughness is as follows (Zhou et al, 2022):…”

Section: Fracture Toughnessmentioning

confidence: 99%

“…When AEA is added to FRAC, the effect of PPFs on fracture properties and flexural strength changes from increased to decreased. As just PPFs are added to FRAC, before the fracture failure, the main roles of PPFs are to connect the tiny cracks inside FRAC and bear part of the tensile stress (Zhou et al, 2022). Therefore, the initial fracture toughness of FRAC with PPFs and plain FRAC is relatively close, while the unstable fracture toughness of FRAC with PPFs is increased.…”

Section: Fracture Toughnessmentioning

confidence: 99%

See 1 more Smart Citation

Effects of air-entraining agent and polypropylene fiber on the mechanical properties, autogenous shrinkage, and fracture properties of fully recycled aggregate concrete

Ding

Zhang²,

Zhao³

et al. 2022

Front. Mater.

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The effects of air-entraining agent (AEA) and polypropylene fiber (PPF) on the autogenous shrinkage and fracture properties of fully recycled aggregate concrete (FRAC) are studied to obtain FRAC with low density, low autogenous shrinkage, and superior fracture properties. Six groups of FRAC with different AEA (0, 5%, 10%) and PPF (0, 1.2 kg/m3) contents were prepared for test. The results illustrate that AEA can slightly reduce density but that it has an adverse effect on the strength and fracture properties of FRAC. The incorporation of PPFs can reduce the adverse effect of AEA on compressive strength and splitting tensile strength, but it will increase the adverse effect on fracture properties. Furthermore, the addition of PPFs alone will significantly reduce compressive strength and splitting tensile strength, whereas flexural strength and fracture properties are increased. The addition of AEA can improve the adverse effect of PPFs on compressive strength and splitting tensile strength, but flexural strength and fracture properties will decrease rather than increase. The addition of 10% AEA can greatly reduce autogenous shrinkage, and 5% AEA can reduce autogenous shrinkage at an early age. Incorporating PPFs can further reduce autogenous shrinkage. The study mainly examines the effects of AEA and PPF on the autogenous shrinkage of FRAC, and provides some new ideas for producing high-performance FRAC. At the same time, the cooperative effect of AEA and PPF on the properties of FRAC is also studied.

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Section: Fracture Toughnessmentioning

confidence: 99%

Section: Fracture Toughnessmentioning

confidence: 99%

Effects of air-entraining agent and polypropylene fiber on the mechanical properties, autogenous shrinkage, and fracture properties of fully recycled aggregate concrete

Ding

Zhang²,

Zhao³

et al. 2022

Front. Mater.

View full text Add to dashboard Cite

show abstract

“…This leads to the great head loss and substantially reduced permeability of the cracks in concrete structures [ 6 , 7 ]. Additionally, Zhou et al [ 8 ] have demonstrated that PF significantly decreases the release rate of elastic strain energy in concrete, thereby increasing the dissipation energy. This enhancement in energy dissipation improves the ductility and toughness of the concrete, reducing its brittleness and crack width under load, and consequently decreasing the permeability of cracks under loading [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Polypropylene Fiber on Concrete Permeability under Freeze-Thaw Conditions and Mechanical Loading

Zeng,

Wang,

Wang

et al. 2024

Materials

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Polypropylene fiber reinforcement is an effective method to enhance the durability of concrete structures. With the increasing public interest in the widespread use of polypropylene fiber reinforced concrete (PFRC), the necessity of evaluating the mechanism of polypropylene fiber (PF) on the permeability of concrete has become prominent. This paper describes the influence of PF on the concrete permeability exposed to freeze-thaw cycles under compressive and tensile stress. The permeability of PFRC under compressive and tensile loads is accurately measured by a specialized permeability setup. The permeability of PFRC under compressive and tensile loads, the volume change of PFRC under compressive load, and the relationship between compressive stress levels at minimum permeability and minimum volume points of PFRC are discussed. The results indicate that the addition of PF adversely affects the permeability of concrete without freeze-thaw damage and cracks. However, it decreases the permeability of concrete specimens exposed to freeze-thaw cycles and cracking. Under compressive load, the permeability of PFRC initially decreases slowly and follows by a significant increase as the compressive stress level increases. This phenomenon correlates with the volume change of the specimen. The compressive stress level of the minimum permeability point and compressive stress level of the minimum volume point of PFRC exhibit a linear correlation, with a fitted proportional function parameter γ ≈ 0.98872. Under tensile load, the permeability of PFRC increases gradually with radial deformation and follows by a significant increase. The strain-permeability curves of PFRC under loading are studied and consist of two stages. In stage I, the permeability of PFRC gradually decreases with the increase of strain under compressive load, while the permeability increases with the increase of strain under tensile load. In stage II, under compressive load, the permeability of PFRC increases with the increase of freeze-thaw cycles, whereas under tensile load, the permeability gradually decreases with the increase of freeze-thaw cycles. The reduction of PF on the permeability of PFRC under tensile load is greater than that under compressive load. In future research, the relationship between strain and permeability of PFRC can be integrated with its constitutive relationship between stress and strain to provide a reference for the application of PF in the waterproofing of concrete structures.

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Effect of fiber type on the mechanical properties and durability of hardened concrete

Zhang,

Zhou,

Zheng

2023

J Mater Sci

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Fracture behavior of polypropylene fiber reinforced concrete modified by rubber powder exposed to elevated temperatures

Cited by 20 publications

References 56 publications

Effects of air-entraining agent and polypropylene fiber on the mechanical properties, autogenous shrinkage, and fracture properties of fully recycled aggregate concrete

Effects of air-entraining agent and polypropylene fiber on the mechanical properties, autogenous shrinkage, and fracture properties of fully recycled aggregate concrete

Influence of Polypropylene Fiber on Concrete Permeability under Freeze-Thaw Conditions and Mechanical Loading

Effect of fiber type on the mechanical properties and durability of hardened concrete

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