Fibre reinforced sprayed concrete for ground support

Bernard, E. S.; Thomas, Alun

doi:10.1016/j.tust.2020.103302

Cited by 30 publications

(4 citation statements)

References 50 publications

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“…Hooked steel fibers can also be used in this inserting technique. Eventually, the 3DCP-SIT fabricates a printed fiber-reinforced concrete structure; the cast steel-fiber reinforced concrete attracted much research attention in past decades and was applied widely in construction [55], including tunneling [56].…”

Section: The 3dcp-sit Techniquementioning

confidence: 99%

Experimental Investigation on Inner- and Inter-Strip Reinforcements for 3D Printed Concrete via Automatic Staple Inserting Technique

Cao

Cui

2022

Applied Sciences

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Lack of reinforcements is an existing drawback of 3D printed cementitious components, which is an urgent concern. A staple-inserting apparatus was developed and installed on a 3D printer and automatically fabricated 3D printed and staple-reinforced components with 98% successful insertion to achieve inner- and inter-reinforcement of the printed strips. The inserted staples inside the printed strips improved the compressive strength by 25% maximum owing to the inner locking effect by the staple pins, while the flexural strength did not increase because the scattered staples functioned separately. The staples over the strip interfaces remarkably increased the flexural stress by 46–120%. The inserted staples demonstrated a significant strip locking effect, but the unavoidable voids decreased the bonding between staples and the composite. The mechanical analysis concluded that the printing parameters considerably affected the reinforcing rate. The staple inserting technique proved the feasibility of automatic fabrication of fiber-reinforced and printed concrete structures.

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Section: The 3dcp-sit Techniquementioning

confidence: 99%

Experimental Investigation on Inner- and Inter-Strip Reinforcements for 3D Printed Concrete via Automatic Staple Inserting Technique

Cao

Cui

2022

Applied Sciences

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“…Untuk rekomendasi penyangga pada terowongan dapat dilihat pada Gambar 9 berikut ini Gambar 9. Rekomendasi penyangga terowongan berdasarkan (Q-System) Rekomendasi penyangga terowongan berdasarkan metode klasifikasi massa batuan (Q-System) adalah fibre reinforced sprayed concrete and bolting (Bernard & Thomas, 2020), yaitu Shotcrete dengan ketebalan 70 mm dengan spasi pemasangan Rockbolt ditambah Shotcrete 2,05 m, spasi pemasangan Rockbolt tanpa Shotcrete 1,5 m, dan panjang Rockbolt 4 m.…”

Section: Faktor Keamananunclassified

Analisis Kestabilan Batuan Pada Rencana Pembangunan Terowongan Dengan Elemen Hingga Dan (Q – System) Di Kota Samarinda

Faisal

Oktaviani²,

Trides³

et al. 2022

SOSTECH

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Terowongan adalah lubang bukaan di bawah permukaan tanah atau gunung dan dibuat mendatar. Kajian awal sebelum dibuatnya terowongan seperti kajian geologi dan geoteknik sangatlah diperlukan, karena dapat memberikan gambaran tentang awal kondisi batuan yang ada di sekitar rencana terowongan tersebut. Klasifikasi massa batuan merupakan tumpuan dasar dalam menganalisis kualitas massa batuan dalam menginformasikan kondisi geologi daerah setempat untuk tujuan pembangunan. Salah satu Klassifikasi massa batuan yang digunakan untuk terowongan adalah Q-system yang dapat memberi luaran berupa rekomendasi jenis penyangga. Dari hasil penelitian kualitas massa batuan dilokasi penelitian tergolong kualitas buruk dan sedang. Dengan rekomendasi penyangga terowongan berdasarkan Q-system adalah fibre reinforced sprayed concrete and bolting , yaitu Shotcrete dengan ketebalan 70 mm dengan spasi pemasangan Rockbolt ditambah Shotcrete 2,05 m, spasi pemasangan Rockbolt tanpa Shotcrete 1,5 m, dan panjang Rockbolt 4 m. Nilai faktor keamanan pada penampang terowongan 1,2,3,4 dan 5 termasuk kategori krisis atau tidak aman sedangkan pada penampang terowongan 6 masuk kedalam kategori stabil atau aman

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“…This is justified by the fact that MSFs are not sensitive to corrosion and its use has less CO 2 -eq associated respect to other steel-based reinforcement (both for production and considering the type of cements that can be used). It must be emphasized that MSFRC has already been satisfactorily used in precast concrete tunnels linings, [8][9][10][11][12][13][14][15] temporary and permanent sprayed concrete linings, 16 slabs-on ground, 17 precast panels for facades, 18 sewerage precast concrete pipes 19-22 [x], prestressed concrete elements subjected to flexure and shear as a replacement of stirrups, 23 and elevated flat slabs. 24,25 As per practical implementation of MSRFC in walls, however, there are reasonable technical and scientific questions due to the lack of experience that shall be provided with justifications and answers.…”

Section: Introductionmentioning

confidence: 99%

Macrosynthetic fibers as replacement of conventional steel reinforcement for concrete of partition walls

Fernández Ruiz,

Redaelli,

Nogales Arroyo

et al. 2024

Structural Concrete

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Conventional reinforced concrete for building partition walls has proven numerous advantages (in terms for instance of acoustic performance and robustness) with respect to other existing alternatives. However, its use leads to high material consumption and environmental footprint together with time‐consuming processes for placing steel reinforcement. To reduce time‐consuming processes and carbon footprint, the replacement of ordinary steel reinforcement by structural macrofibers is envisioned as a suitable solution due to: (1) the acceptance of fiber reinforced concrete (FRC) for structural applications in various guidelines (as Annex L of FprEN 1992‐1‐1:2023, draft for future Eurocode 2) and (2) the fact that the amounts of fibers necessary to reach the required mechanical performance of the FRC for crack control are expected to be economically competitive. Additionally, within the spectra of types of macrofibers capable of efficiently reinforce concrete, macrosynthetic fibers (MSFs) were considered in this research due to their benefits in terms of durability performance and reduced environmental impact (potential to use cements with lower clinker content and reduced thickness of elements). Aiming at confirming both the constructability, casting procedure and structural performance of macrosynthetic fiber reinforced concrete (MSFRC) partition walls, these walls were constructed in a real building in Switzerland. In this article, the design process is presented as well as the associated MSFRC material and structural experimental programmes, conducted both in laboratory and on‐site. In addition, several FEM‐modeling considerations as well as quality control and construction aspects observed during the implementation process are raised. Finally, for reference purposes, a first approach to the economic and environmental impact (CO2eq‐based) of such MSFRC walls is presented.

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Fibre reinforced sprayed concrete for ground support

Cited by 30 publications

References 50 publications

Experimental Investigation on Inner- and Inter-Strip Reinforcements for 3D Printed Concrete via Automatic Staple Inserting Technique

Experimental Investigation on Inner- and Inter-Strip Reinforcements for 3D Printed Concrete via Automatic Staple Inserting Technique

Analisis Kestabilan Batuan Pada Rencana Pembangunan Terowongan Dengan Elemen Hingga Dan (Q – System) Di Kota Samarinda

Macrosynthetic fibers as replacement of conventional steel reinforcement for concrete of partition walls

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