Mechanical and Environmental Proprieties of UHP-FRCC Panels Bonded to Existing Concrete Beams

Nishiwaki, Tomoya; Mancinelli, Oscar; Fantilli, Alessandro Pasquale; Adachi, Yuka

doi:10.3390/su13063085

Cited by 3 publications

(2 citation statements)

References 20 publications

(21 reference statements)

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“…For instance, UHPC specimens subjected to 400 °C temperature and 50 MPa pressure can exhibit an increase in compressive strength up to 650 MPa [ 4 ]. The innovative UHPC material has a broad range of potential applications in constructing diverse structures and upgrading and rehabilitating existing ones [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. The major disadvantage of UHPC is its high cement content leading to increased CO 2 emissions and associated climate change.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Ultrahigh-Performance Concrete Tunnel Lining Segments

Abbas

Nehdi

2021

Materials

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Ultrahigh-performance concrete (UHPC) is a novel material demonstrating superior mechanical, durability and sustainability performance. However, its implementation in massive structures is hampered by its high initial cost and the lack of stakeholders’ confidence, especially in developing countries. Therefore, the present study explores, for the first time, a novel application of UHPC, incorporating hybrid steel fibers in precast tunnel lining segments. Reduced scale curved tunnel lining segments were cast using UHPC incorporating hybrid 8 mm and 16 mm steel fibers at dosages of 1%, 2% and 3% by mixture volume. Flexural and thrust load tests were conducted to investigate the mechanical behavior of UHPC tunnel lining segments thus produced. It was observed that the flow of UHPC mixtures decreased due to steel fibers addition, yet steel fibers increased the mechanical and durability properties. Flexural tests on lining segments showed that both the strain hardening (multiple cracking) and strain softening (post-peak behavior) phases were enhanced due to hybrid addition of steel fibers in comparison with the control segments without fibers. Specimens incorporating 3% of hybrid steel fibers achieved 57% increase in ultimate load carrying capacity and exhibited multiple cracking patterns compared to that of identical UHPC segments with 1% fibers. Moreover, segments without fibers incurred excessive cracking and spalling of concrete at the base under the thrust load test. However, more stable behavior was observed for segments incorporating steel fibers under the thrust load, indicating its capability to resist typical thrust loads during tunnel lining field installation. This study highlights the potential use of UHPC with hybrid steel fibers for improved structural behavior. Moreover, the use of UHPC allows producing structural members with reduced cross-sectional dimensions, leading to reduced overall structural weight and increased clear space.

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Section: Introductionmentioning

confidence: 99%

Mechanical Behavior of Ultrahigh-Performance Concrete Tunnel Lining Segments

Abbas

Nehdi

2021

Materials

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“…Moreover, the use of High-Performance Cementitious Composites requires further investigations into their mechanical behaviour, especially in the cases where they are supposed to be almost perfectly bonded to other materials, such as normal-strength concrete of existing RC members [7,8] or masonry walls [9], also considering their use with the twofold objective of structural (and, specifically, seismic) and energy retrofitting of buildings. In this respect, retrofitting existing buildings can oftentimes be more cost-effective than constructing a new facility.…”

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confidence: 99%