Strengthening of concrete structures with ultra high performance fiber reinforced concrete (UHPFRC): A critical review

Huang, Yitao; Grünewald, S.; Schlangen, Erik; Luković, Mladena

doi:10.1016/j.conbuildmat.2022.127398

Cited by 67 publications

(9 citation statements)

References 95 publications

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“…In practical terms, the slab constitutes a crucial structural element within a building, often requiring the largest quantity of concrete. Primarily tasked with supporting vertical loads, the slab's design focuses solely on this aspect [11][12][13]. Furthermore, as the building span extends, the thickness of the slab increases, necessitating corresponding adjustments in beam and column dimensions.…”

Section: Introductionmentioning

confidence: 99%

Shear Reinforcement Effectiveness of One-Way Void Slab with the Hollow Core Ratio and Shear Reinforcement

Cho,

Na,

2024

Applied Sciences

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Void slabs offer a promising solution for sustainable construction due to their reduced weight and potential for recycled materials. However, their inherent hollowness can compromise shear capacity compared to solid slabs. This study investigates the effectiveness of shear reinforcement in mitigating this vulnerability. Experimental testing with a four-point support loading confirmed shear failure in all specimens and revealed a significant reserve of shear strength exceeding predictions from ACI 318-14 by at least 1.436. This suggests the potential for more efficient designs that utilize less shear reinforcement while maintaining structural integrity. An inverse relationship between porosity and shear strength was observed, highlighting the importance of considering void content during design. Among established design codes (ACI 318-14, UBC 2, and CEB-FIP 1990), CEB-FIP 1990 provided the most accurate prediction of shear capacity for these reinforced hollow slabs. These findings offer valuable insights for optimizing the shear design of voided slabs. The observed strength reserve suggests the potential for reduced shear reinforcement while maintaining safety. Additionally, the influence of porosity and the code comparison provide crucial considerations for future design practices. This research paves the way for developing efficient and safe voided slab applications, promoting sustainability in the construction industry.

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Section: Introductionmentioning

confidence: 99%

Shear Reinforcement Effectiveness of One-Way Void Slab with the Hollow Core Ratio and Shear Reinforcement

Cho,

Na,

2024

Applied Sciences

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“…Despite the initial construction expenses, it has been observed that the overall life cycle maintenance cost of UHPC (Strategy A) is lower than that of normal concrete (Strategy B), making it a cost-effective choice in the long term (see Figure 1) [11]. Moreover, immature construction technology and lack of design codes are a couple shortcomings that also limit its wide practical application [69]. However, some efforts have been made to establish design standards such as AFGC [70] and JSCE [71] to facilitate the application of UHPC.…”

Section: Introductionmentioning

confidence: 99%

Flexural and Shear Strengthening of Reinforced-Concrete Beams with Ultra-High-Performance Concrete (UHPC)

Ahmed,

Biswas,

Sen

et al. 2024

Construction Materials

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Ultra-high-performance concrete (UHPC) is considered to be a promising material for the strengthening of damaged reinforced concrete (RC) members due to its high mechanical strength and low permeability. However, its high material cost, limited code provisions, and scattered material properties limit its wide application. There is a great need to review existing articles and create a database to assist different technical committees for future code provisions on UHPC. This study presents a comprehensive overview focusing on the effect of the UHPC layer on the flexural and shear strengthening of RC beams. From this review, it was evident that (1) different retrofitting configurations have a remarkable effect on the cracking moment compared to the maximum moment in the case of flexural strengthening; (2) the ratios of the shear span and UHPC layer thickness have a notable effect on shear strengthening and the failure mode; and (3) different bonding techniques have insignificant effects on shear strengthening but a positive impact on flexural strengthening. Overall, it can be concluded that three-side strengthening has a higher increment range for flexural (maximum, 81%–120%; cracking, 300%–500%) and shear (maximum, 51%–80%; cracking, 121%–180%) strengthening. From this literature review, an experimental database was established, and different failure modes were identified. Finally, this research highlights current issues with UHPC and recommends some future works.

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“…construction industry in recent years due to its exceptional mechanical properties and durability [1][2][3][4]. In general, UHPC designed using the dense packing theory of solid materials without coarse aggregates or with a low content of coarse aggregates and a high fiber content features a high compressive strength (>150 MPa, approximately 3-16 times higher than ordinary concrete), high stiffness and ductility, as well as excellent rheological properties in the fresh state [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Electrical properties of ultra-high-performance concrete with various reinforcing fibers

Qin,

Ding,

Qiu

et al. 2023

Meas. Sci. Technol.

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Understanding the electrical properties of ultra-high-performance concrete (UHPC) is of paramount importance in the realm of smart concrete as it unlocks the potential for creating advanced, intelligent, and resilient infrastructure systems. This study focused on systematically assessing the electrical behaviors of UHPC with two commonly-used reinforcing conductive fillers, i.e. carbon fibers (CFs) and steel fibers (SFs). The effects of fiber type, fiber length, fiber content, and curing age on the alternating current (AC) resistivities and AC electrochemical impedance spectroscopy (AC-EIS) spectra of fiber-reinforced UHPC were investigated, and the equivalent circuit models of fiber-reinforced UHPC were established. Experimental results showed that the AC resistivities of UHPC with CFs and with SFs both exhibited a faster growth rate during the 14–28 d of curing, but subsequently decelerated after the completion of hydration, and stabilized at 90–120 d. Compared with the control sample, the addition of both CFs and SFs resulted in a reduction of the electrical resistivity of UHPC, with a more pronounced decrease observed with higher fiber content. In particular, the addition of SFs demonstrated a more significant reduction in UHPC’s AC resistivity in relative to CFs, with the addition of 4 vol.% copper-plated end-hook SFs remarkably lowering the resistivity by up to 87.5%. Furthermore, the introduction of different types of fibers caused remarkably different AC-EIS topologies of UHPC. The proposed equivalent circuit models reveal that compared to the control sample, the introduction of fibers can provide the fiber-fiber conductive paths and fiber-wrapped hydration products (Q F R F) within UHPC matrix. The role of UHPC matrix (Q 1 (R 1 W 1) in the conductive path of SFs-reinforced UHPC is weakened compared to that of CFs-reinforced UHPC as reflected by the differences in the impedance values of Nyquist plots.

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Strengthening of concrete structures with ultra high performance fiber reinforced concrete (UHPFRC): A critical review

Cited by 67 publications

References 95 publications

Shear Reinforcement Effectiveness of One-Way Void Slab with the Hollow Core Ratio and Shear Reinforcement

Shear Reinforcement Effectiveness of One-Way Void Slab with the Hollow Core Ratio and Shear Reinforcement

Flexural and Shear Strengthening of Reinforced-Concrete Beams with Ultra-High-Performance Concrete (UHPC)

Electrical properties of ultra-high-performance concrete with various reinforcing fibers

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