Performance of Carbon Fiber Filament Reinforcing Cement Mortar

Salama, Ahmed; Edris, Walid Fouad

doi:10.28991/cej-2021-03091753

Cited by 3 publications

(7 citation statements)

References 29 publications

(33 reference statements)

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“…The hardened density of all three specimens increased with time as shown in Figure 5, which is consistent with the previous literature [1,2,11,[21][22][23]. Furthermore, hardened density of the cement paste is influenced by length of curing period [24].…”

Section: Hardened Density Of Cement-pastesupporting

confidence: 90%

“…According to Paul et al, [9], the strength improvement in concrete was because the fibre acted as a bridge material that keep the concrete particles near to another. However, the addition of fibres reduced the slump of the concrete [10][11][12][13]. This was because the flow of fresh concrete was restricted by the presence of carbon fibre [14].…”

Section: Introductionmentioning

confidence: 99%

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Engineering Properties of Cement-Paste with Polypropylene and Carbon Fibres

Anand Ryan Thurairajah,

Ahmad Nurfaidhi Rizalman,

Eliezer Nevall Anthony

et al. 2024

ARAM

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Concrete has strong compressive strength, but it is brittle and vulnerable to tension-induced failure. To address the issue, this research investigated the effect of the addition of fibre on the engineering properties of cement paste. There were two fibres examined in this study, which include polypropylene fibre (PF) and carbon fibre (CF). The engineering properties that were studied include flowability, hardened density, compressive strength, and flexural strength at 7, 28, and 56 days. The results indicated that the addition of fibre had only subtle effects on workability, attributed to a judiciously chosen low-volume fraction of fibres. Notably, a consistent increase in hardened density, compressive strength, and flexural strength was observed over the curing period, driven by ongoing hydration processes. Therefore, it can be concluded that the incorporation of PF and CF significantly improved cement paste engineering properties, outperforming the control specimen in hardened density, compressive strength, and flexural strength.

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Section: Hardened Density Of Cement-pastesupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Cement-Paste with Polypropylene and Carbon Fibres

Anand Ryan Thurairajah,

Ahmad Nurfaidhi Rizalman,

Eliezer Nevall Anthony

et al. 2024

ARAM

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“…This outcome occurred due to the fresh concrete movement obstruction from the fibre interaction with other concrete constituents [9]. Previous studies also demonstrated a positive correlation between the higher fibre percentage and fibre length in improving the compressive and flexural strength of concrete [6][7][8][9][10][11][12]. These improved concentre properties were attributed to the fibres, serving as a bridge to maintain the proximity of concrete particles [13].…”

Section: Introductionmentioning

confidence: 96%

“…Numerous studies demonstrated that gradually adding carbon fibre into concrete reduced workability [5][6][7][8]. This outcome occurred due to the fresh concrete movement obstruction from the fibre interaction with other concrete constituents [9].…”

Section: Introductionmentioning

confidence: 99%

Mixing Sequence Effect of Cement Composites With Carbon Fibres

Rizalman,

Anthony,

Thurairajah

et al. 2024

IIUMEJ

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Carbon fibres are widely recognised as reinforcement materials that effectively control cracks in concrete structures. Nonetheless, these fibres do not disperse uniformly inside the cement matrix, disrupting the mixture homogeneity. To address this concern, this study investigated two distinct mixing sequences of cement composites with carbon fibres. Two mixing sequences were investigated including the addition of fibres after cement (AC-CF) and the addition of fibres before cement (BC-CF). The surface topography of carbon fibres and the engineering properties of the cement paste were also examined. Consequently, carbon fibres in cement composite produced lower flowability due to the surface roughness. The AC-CF specimen demonstrated the highest hardened density at 28 days with 2679.22 kg/m3 followed by BC-CF and the control specimen with 2386.08 kg/m3 and 2278.36 kg/3, respectively. The AC-CF specimen also had the highest compressive strength at 28 days with 69.91 MPa, followed by BC-CF and the control specimen with 65.92 MPa and 63.20 MPa, respectively. Further, the flexural strength of the AC-CF specimen exhibited the highest strength with 10.86 MPa, followed by BC-CF and the control specimen with 9.35 MPa and 9.17, respectively. The fibre dispersion in AC-CF was also superior to BC-CF. Therefore, it can be concluded that the best mixing sequence is the addition of fibre after cement (AC-CF) because it had better fibre dispersion and engineering properties compared to the addition of fibre before cement (BC-CF). ABSTRAK: Gentian karbon lebih dikenali sebagai bahan bantuan yang berkesan dalam mengawal keretakan pada struktur konkrit. Walau bagaimanapun, gentian ini tidak tersebar secara seragam di dalam matrik simen dan akan mengganggu kehomogenan campuran. Bagi mengatasi masalah ini, kajian ini mengkaji tentang dua susunan campuran berbeza simen komposit dengan gentian karbon. Dua susunan campuran ini adalah melalui penambahan gentian selepas simen (AC-CF) dan penambahan gentian sebelum simen (BC-CF). Permukaan topografi gentian karbon dan sifat kejuruteraan pes simen turut diperiksa. Kajian mendapati bahawa gentian karbon dalam komposit simen mengurangkan kebolehaliran pes simen disebabkan oleh kekasaran pada permukaan gentian. Spesimen AC-CF menunjukkan ketumpatan pengerasan tertinggi pada hari ke-28 dengan 2679.22 kg/m3 diikuti spesimen BC-CF dan spesimen kawalan sebanyak 2386.08 kg/m3 dan 2278.36 kg/m3, masing-masing. Spesimen AC-CF juga mempunyai kekuatan mampatan tertinggi pada hari ke-28 dengan 69.91 MPa, diikuti oleh spesimen BC-CF dan spesimen kawalan sebanyak 65.92 MPa dan 63.20 MPa, masing-masing. Seterusnya, kekuatan lenturan spesimen AC-CF menunjukkan kekuatan tertinggi dengan 10.86 MPa, diikuti spesimen BC-CF and spesimen kawalan dengan 9.35 MPa dan 9.17 MPa, masing-masing. Penyebaran gentian dalam AC-CF juga lebih baik daripada BC-CF. Oleh itu, kajian ini merumuskan bahawa susunan campuran terbaik adalah dengan penambahan gentian selepas simen (AC-CF) kerana ia mempunyai kekuatan lenturan gentian terbaik dan sifat kejuruteraan berbanding penambahan gentian sebelum simen (BC-CF).

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“…The introduction of fiber reinforcement and/or nanoparticles into cement composites is a common modification method, but fiber and ordinary nanomaterials cannot control the microstructure of the cement hydration products, and it is difficult to block harmful substances from penetration and to protect the reinforcement from corrosion. As a result, reinforcement corrosion may occur [ 10 , 11 , 12 ]. Permeability is one of the most important indexes of the durability of cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Mechanism of Graphene Acting on Water and Chloride Ion Permeability of Cement-Based Materials

Dong

Zhuang

et al. 2023

Materials

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Due to its excellent mechanical properties and high aspect ratio, graphene can significantly improve the water and chloride ion permeability resistance of cementitious materials. However, few studies have investigated the effect of graphene size on the water and chloride ion permeability resistance of cementitious materials. The main issues are as follows: How do different sizes of graphene affect the water and chloride ion permeability resistance of cement-based materials, and by what means do they affect these properties? To address these issues, in this paper, two different sizes of graphene were used to prepare graphene dispersion, which was then mixed with cement to make graphene-reinforced cement-based materials. The permeability and microstructure of samples were investigated. Results show that the addition of graphene effectively improved both the water and chloride ion permeability resistance of cement-based materials significantly. The SEM (scanning electron microscope) images and XRD (X-ray diffraction) analysis show that the introduction of either type of graphene could effectively regulate the crystal size and morphology of hydration products and reduce the crystal size and the number of needle-like and rod-like hydration products. The main types of hydrated products are calcium hydroxide, ettringite, etc. The template effect of large-size graphene was more obvious, and a large number of regular flower-like cluster hydration products were formed, which made the structure of cement paste more compact and thus significantly improved the resistance to the penetration of water and chloride ions into the matrix of the concrete.

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Performance of Carbon Fiber Filament Reinforcing Cement Mortar

Cited by 3 publications

References 29 publications

Engineering Properties of Cement-Paste with Polypropylene and Carbon Fibres

Engineering Properties of Cement-Paste with Polypropylene and Carbon Fibres

Mixing Sequence Effect of Cement Composites With Carbon Fibres

Insights into the Mechanism of Graphene Acting on Water and Chloride Ion Permeability of Cement-Based Materials

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