Processing and Mechanical Properties of Macro Polyamide Fiber Reinforced Concrete

Jeon, Joong Kyu; Kim, Woo Seok; Jeon, Chan Ki; Kim, Jin Cheol

doi:10.3390/ma7127634

Cited by 19 publications

(4 citation statements)

References 25 publications

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“…Polyamide fiber reinforced shotcrete (PAFRS) was developed to improve mechanical properties and workability. The detailed manufacturing process has been described in other documents [ 17 , 18 ]. A comparison of 0.47 m diameter and 30 mm long polyamide (PA) fiber to 1.0 mm × 0.5 mm rectangular and 42 mm long polypropylene (PP) fiber [ 19 ] shows that 650 MPa tensile strength of PA fiber is higher than 550 MPa of PP fiber, though PA fiber (3 GPa) has less elastic modulus than PP fiber (8.2 GPa).…”

Section: Introductionmentioning

confidence: 99%

Polyamide Fiber Reinforced Shotcrete for Tunnel Application

Jeon

Kim

et al. 2016

Materials

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This study intends to establish the mechanical properties of polyamide fiber reinforced shotcrete (PAFRS) in terms of compressive and flexural strengths, in accordance with ASTM C1609/C1609M-12. The mechanical properties identified the influence of polyamide fiber content on the PAFRS strength. This study evaluated the toughness of PAFRS and proposed additional toughness level criteria to better represent organic fiber performance. In addition, the fiber rebounding rate and PAFRS performance in tunneling application were evaluated based on a tunnel application in Korea. PAFRS with 0.6%~0.8% volume content in tunneling shotcrete could significantly improve flexural ductility, toughness, and ultimate load capacity. Fiber rebounding tests exhibited a low rebounding rate (8.5%) and low fiber drop (63.5%). Therefore, PAFRS applied to a tunnel exhibited stability and constructability.

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Section: Introductionmentioning

confidence: 99%

Polyamide Fiber Reinforced Shotcrete for Tunnel Application

Jeon

Kim

et al. 2016

Materials

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“…Once such substitution has been accepted as viable, it will boost industrial development and research on fibers. Hence, new fiber types, with various shapes and constituent materials have emerged [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Improving the Reinforcement of Polyolefin Fiber Reinforced Concrete for Infrastructure Applications

Alberti

Enfedaque

Gálvez

2015

Fibers

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Abstract:The increase in the use of polyolefin fiber-reinforced concrete (PFRC) is in contrast to the limited amount of published research about its fracture behavior. This study assesses the main mechanical and fracture properties of PFRC by using conventional and self-compacting concrete with various dosages. The results highlight the significant performance of PFRC and revealed that improving its residual strength for small deformations would enhance its use for structural purposes. For that matter, a combination of polyolefin and steel-hooked fibers was used, improving the results and showing synergies between the two types of fibers that could be exploited for infrastructure applications. The significance of this research is, in addition to the characterization of PFRC, the optimum selection and definition of the proportions and characteristics of the types of fibers chosen for the combination. The results proved that, by combining hooked-steel fibers and macro-polyolefin fibers, it is possible to preserve the high-performance fresh properties and obtain a reliable behavior with synergies in the fracture results. The latter provides an efficient use of the materials, as well as a better mechanical behavior in both service and failure states.

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“…The literature review shows that polyethylene terephthalate (PET), high-density polyethylene (HDPE), polyvinyl chloride (PVC), low-density polyethylene (LDPE), polypropylene (PP), polystyrene (PS) and rubber waste [19,[41][42][43] were most often used to produce cement mortars and concretes. There are significantly fewer reports on the use of other polymer materials, including polyamide, although this material was used both as waste and as a clean, synthesized fiber [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61]. Polyamide waste [44][45][46][47][48][49] was used both for the production of cement mortars and concretes.…”

Section: Introductionmentioning

confidence: 99%

Cement Mortars Based on Polyamide Waste Modified with Fly Ash from Biomass Combustion—A New Material for Sustainable Construction

Ulewicz,

Jura,

Gnatowski

2024

Sustainability

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The article presents an analysis of the possibility of using the waste of polyamide 6 modified with fly ash (in the amount of 5, 10 and 15%) from the burning of wood–palm kernel shells biomass as an addition to cement mortar. Fly ash from the burning of biomass in a circulating fluidized bed boiler (which currently has no practical use) was first used to produce polyamide 6, and then post-production polymer waste (added at 20, 40 and 60%) was used to produce ecological mortar. The use of this type of waste is both economically profitable and desirable due to the need to implement waste material management processes in a closed circuit. The addition of polyamide 6 waste containing 5% fly ash in amounts of 20 and 40% and waste containing 10% ash in 20% to cement mortars improves their mechanical properties. The compressive strength of cement mortars (after 28 days of maturation) containing 20 and 40% of polyamide waste containing 5% fly ash increases by 6.6 and 4.6%, respectively, and the flexural strength by 4.9 and 3.4% compared to the control mortars. However, the compressive strength of mortars with the addition of 20% polyamide waste containing 10% fly ash increases by 4.2% and the flexural strength by 3.7%. Cement mortars modified with waste are characterized by slightly lower water absorption and mechanical strength after the freezing–thawing process (frost resistance) compared to control mortars and do not have an adverse effect on the environment in terms of leaching metal ions.

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Processing and Mechanical Properties of Macro Polyamide Fiber Reinforced Concrete

Cited by 19 publications

References 25 publications

Polyamide Fiber Reinforced Shotcrete for Tunnel Application

Polyamide Fiber Reinforced Shotcrete for Tunnel Application

Improving the Reinforcement of Polyolefin Fiber Reinforced Concrete for Infrastructure Applications

Cement Mortars Based on Polyamide Waste Modified with Fly Ash from Biomass Combustion—A New Material for Sustainable Construction

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