Sustainable use of recycled carbon fiber reinforced polymer and crumb rubber in concrete: mechanical properties and ecological evaluation

Chen, Xiong; Li, Qiangsheng; Lan, Tianhao; Li, Hao-Dao; Long, Wu-Jian; Xing, Feng

doi:10.1016/j.jclepro.2020.123624

Cited by 66 publications

(28 citation statements)

References 35 publications

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“…The compressive strength decreased slightly with RCA substitution of NCA from 0% to 100%, whereby mixtures R50-H1.5, R100-H1.5, and R100-C1.5 attained 54.3 MPa, 53.2 MPa, and 51.9 MPa, respectively, which were 19.9%, 22.3%, and 19.3% higher than common RAC. There are two reasons for the improvement of compressive strength: (1) the high Young’s modulus and stiffness of steel fiber contributed to an increase in the compressive strength of the concrete matrix; (2) as shown in Figure 6 , the random distribution of fibers in concrete provided a confinement effect, which restricted the crack propagation [ 43 , 44 ]. Furthermore, comparing the SFRAC specimens with a 100% RCA substitution rate, it can be observed that HF had a better influence than CF on the compressive strength of RAC.…”

Section: Resultsmentioning

confidence: 99%

The Impact Resistance and Mechanical Properties of Recycled Aggregate Concrete with Hooked-End and Crimped Steel Fiber

Kong

yao

et al. 2022

Materials

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The utilization of recycled coarse aggregate (RCA) from construction and demolition waste (CDW) is a sustainable solution to protect the fragile natural environment and save the diminishing natural resources. The current study was aimed at exploring the impact resistance and mechanical properties of recycled aggregate concrete (RAC) affected by hooked-end steel fiber (HF) and crimped steel fiber (CF). Fifteen concrete mixtures considering different RCA substitution ratio, steel fiber dosage, and steel fiber shapes were designed. Meanwhile, a statistical analysis method-based Weibull distribution was introduced to evaluate the variations of impact test results, presented using a reliability function. Lastly, the microstructural morphologies of interfacial transition zones at the cement paste/aggregate and cement paste/fiber interfaces were observed using a scanning electron microscope (SEM). The experimental results showed that the impact resistance and mechanical properties mildly decreased with the increase in substitution ratio of RCA, whereas they conclusively increased with the increase in steel fiber content. Steel fiber recycled aggregate concrete (SFRAC) with 1.5% steel fiber content had the best impact resistance, and its initial cracking times and final failure times were 3.25–4.75 and 8.78–29.08 times those of plain RAC, respectively. HF has better impact resistance than CF. The SEM observations of microstructures indicated that the hardened cement paste of natural aggregate concrete (NAC) was more compact than that of RAC. Steel fiber had a better connection with the cement paste interface than that of aggregate and cement paste owing to better thermal conductivity. This research could be a guide for SFRAC as a structural material in practical engineering, steering the construction industry toward the circular economy.

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Section: Resultsmentioning

confidence: 99%

The Impact Resistance and Mechanical Properties of Recycled Aggregate Concrete with Hooked-End and Crimped Steel Fiber

Kong

yao

et al. 2022

Materials

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“…To supplement the tensile strength and toughness of HSC and to control the cracks, fibers have proven to be very encouraging [ 8 , 10 ]. Fiber reinforcement also advances the flexural strength, impact toughness, and energy absorption capacity under both compression and tension by containing the crack proliferation [ 2 , 11 , 12 , 13 ]. It also helps in controlling the cracks developed during the shrinkage of high binder contents in HSC families [ 10 , 14 ], thus delaying the onset of failure under different types of loads.…”

Section: Introductionmentioning

confidence: 99%

Development of Ductile and Durable High Strength Concrete (HSC) through Interactive Incorporation of Coir Waste and Silica Fume

et al. 2022

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The issue of brittleness and low post-peak load energy associated with the plain HSC led to the development of fiber-reinforced concrete (FRC) by using discrete fiber filaments in the plain matrix. Due to the high environmental impact of industrial fibers and plasticizers, FRC development is ecologically challenged. Sustainability issues demand the application of eco-friendly development of FRC. This study is aimed at the evaluation of coir as a fiber-reinforcement material in HSC, with the incorporation of silica fume as a partial replacement of cement. For this purpose, a total of 12 concrete mixes were produced by using three different doses of coir (0%, 1%, 1.5%, and 2% by wt. of binder) with silica fume (0%, 5%, and 10% as volumetric replacements of cement). The examined parameters include compressive strength, shear strength, splitting tensile strength, ultrasonic pulse velocity, water absorption, and chloride ion permeability. The scanning electron microscopy (SEM) technique was adopted to observe the microstructure of the CF-reinforced concrete. The results revealed that due to the CF addition, the compressive strength of HSC reduces notably; however, the splitting tensile strength and shear strength experienced notable improvements. At the combined incorporation of 1.5% CF with 5% silica fume, the splitting tensile strength and shear strength of the concrete experienced improvements of 47% and 70%, respectively, compared to that of the control mix. The CF incorporation is detrimental to the imperviousness of concrete. The combined incorporation of CF and silica fume is recommended to minimize the negative effects of CF on the permeability resistance of concrete. The SEM results revealed that CF underwent a minor shrinkage with the age.

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“…Firstly, coupling agents such as maleic anhydride grafted PP and silane coupling agents were used to enhance the interface compatibility of natural fibers and PP [ 29 , 30 , 31 , 32 ]. Second, some inorganic materials (glass fiber [ 18 ], carbon fiber [ 33 ], carbon nanotube [ 34 ], clay [ 35 , 36 ]) were filled to reinforce the mechanical properties of the polymer. However, few reports focus on co-filling reinforced plant fiber /polymer composites with natural cellulose fibers and needle-like mineral whiskers.…”

Section: Introductionmentioning

confidence: 99%

Tobacco Stalk Flour/Magnesium Oxysulfate Whiskers Reinforced Hybrid Composites of Recycled Polypropylene: Mechanical and Thermal and Antibacterial Properties

Yuan

Yang

et al. 2022

Polymers

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The present investigation utilizes tobacco stalks flour and magnesium oxysulfate whiskers as fillers to enhancers the recycle polypropylene through melt blending and injection molding. Studied the microscopic morphology, mechanical, thermal, and antibacterial properties of recycled polypropylene (rPP) based composites with different weight ratios of tobacco stalks flour (TSF) and magnesium oxysulfate whiskers (MOSw). Composites’ morphological studies indicated that tobacco stalks flour, and recycled polypropylene has good adhesion, improving composites’ mechanical properties. The addition of TSF did not significantly change the tensile strength of rPP, but it can effectively increase the flexural strength and flexural modulus. Compared with rPP, adding 30 wt% tobacco stalks flour to rPP can increase the flexural strength by about 32.74%. Meanwhile, the addition of magnesium oxysulfate whiskers further improves the material’s tensile strength. An increase in tobacco stalks flour content in the rPP enhances the crystallization temperature and degree of crystallinity of the polymer. In addition, attributed to the existence of tobacco stalks flour hydrophilic and antibacterial ability, the water absorption of the hybrid composites was increased and obtained antibacterial ability. Hence, this study provides a new development idea for tobacco stalks r recycling and applications.

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Sustainable use of recycled carbon fiber reinforced polymer and crumb rubber in concrete: mechanical properties and ecological evaluation

Cited by 66 publications

References 35 publications

The Impact Resistance and Mechanical Properties of Recycled Aggregate Concrete with Hooked-End and Crimped Steel Fiber

The Impact Resistance and Mechanical Properties of Recycled Aggregate Concrete with Hooked-End and Crimped Steel Fiber

Development of Ductile and Durable High Strength Concrete (HSC) through Interactive Incorporation of Coir Waste and Silica Fume

Tobacco Stalk Flour/Magnesium Oxysulfate Whiskers Reinforced Hybrid Composites of Recycled Polypropylene: Mechanical and Thermal and Antibacterial Properties

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