Durability of an UHPFRC under mechanical and chloride loads

Matos, Ana Mafalda; Figueiredo, Stefan Chaves; Nunes, Sandra; Schlangen, Erik; Aguiar, José

doi:10.1016/j.conbuildmat.2021.125223

Cited by 14 publications

(3 citation statements)

References 46 publications

(74 reference statements)

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“…The superior performance of UHPFRC in terms of its mechanical properties leads to a range of structural retrofitting applications. In addition, UHPFRC exhibits an extremely low permeability, which prevents the ingress of detrimental substances such as chlorides and water, leading to significant improvements in durability [65][66][67]. Furthermore, UHP-FRC exhibits better rheological properties and flowability in the fresh state, with the use of adequate amounts of water-reducing admixtures allowing for easy in situ casting [68].…”

Section: Uhpfrc For Structural Retrofittingmentioning

confidence: 99%

Ultra-High-Performance Fibre-Reinforced Concrete for Rehabilitation and Strengthening of Concrete Structures: A Suitability Assessment

2023

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Ultra-high-performance fibre-reinforced concrete (UHPFRC) is a cementitious composite which contains fibres. UHPFRC has emerged as an effective structural retrofitting material due to its superior mechanical properties. In addition, UHPFRC has outstanding durability, ductility and workability; a low permeability; and a high abrasion and fire resistance. These improved characteristics of UHPFRC are obtained by reducing the content of free water in the concrete matrix (leading to less air voids), introducing high strength ductile steel fibres, replacing coarse aggregates with well graded fine aggregates and introducing highly active pozzolanic materials. UHPFRC has excellent bonding with normal strength concrete and it eliminates the issue of debonding which is common in other retrofitting techniques employing fibre-reinforced polymers or externally bonded steel plates. Therefore, considering various aspects, UHPFRC-based structural retrofitting possesses a number of advantages. This paper presents a review of previous studies employing UHPFRC for structural retrofitting applications, highlighting its advantages, limitations and challenges. Aspects of flexural strengthening, combined axial and flexural strengthening, shear strengthening, impact resistance and torsional strengthening are considered for this review. Altogether, the paper aims to enhance the awareness of UHPFRC for structural retrofitting as a step forward towards effective field applications and to outline the potential future directions of research.

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Section: Uhpfrc For Structural Retrofittingmentioning

confidence: 99%

Ultra-High-Performance Fibre-Reinforced Concrete for Rehabilitation and Strengthening of Concrete Structures: A Suitability Assessment

2023

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“…These superior mechanical attributes are observed independently of the different sizes and types of aggregates used in the concrete mix, depending upon the specific range of coarse aggregates utilized in the concrete composition, which closely packs raw materials by different packing models [50,51]. UHPC also offers a dense microstructure with a low water-cement ratio and different pozzolanic materials such as silica fume, thus providing improved resistance against deleterious materials and thermal loads [52][53][54][55][56]. Moreover, UHPC also has the ability to control cracks due to the bridging effect between fiber and surrounding concrete.…”

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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“…In addition, UHPC shows high resistance against degradation processes such as the ingress of carbon dioxide, chloride, sulfate, and corrosive liquids [10,11], and damage due to freeze-thaw cycles and thermal loads [12][13][14][15].…”

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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Durability of an UHPFRC under mechanical and chloride loads

Cited by 14 publications

References 46 publications

Ultra-High-Performance Fibre-Reinforced Concrete for Rehabilitation and Strengthening of Concrete Structures: A Suitability Assessment

Ultra-High-Performance Fibre-Reinforced Concrete for Rehabilitation and Strengthening of Concrete Structures: A Suitability Assessment

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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