Pier Repair/Retrofit Using UHPC—Examples of Completed Projects in North America

Doiron, Gaston

doi:10.21838/uhpc.2016.99

Cited by 20 publications

(8 citation statements)

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“…Extensive research in the last decades lead to the application of UHPC in various fields like for example in bridges, façade elements or pier repair [4][5][6]. In most of the applications the building components were produced in precast concrete element plants and assembled on site [7].…”

Section: Uhpcmentioning

confidence: 99%

Thermal and hydrothermal treatment of UHPC: influence of the process parameters on the phase composition of ultra-high performance concrete

et al. 2021

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Several studies show that thermal and hydrothermal treatment can further improve the excellent properties of UHPC in terms of mechanical strength and durability. While for the thermal treatment the increase in strength is attributed to an intensified pozzolanic and hydraulic reaction, for the hydrothermal treatment previous studies accredited it mostly to the formation of tobermorite. In the presented study thermal and hydrothermal treatment of UHPC samples was systematically varied and the phase formation analysed related to the strength development of a reference sample cured for 28 days in water. For the thermal treatment the results show that the strength increase depends on the protection against desiccation and can be ascribed to an improved pozzolanic reaction of the siliceous fillers. To achieve a significant enhancement of strength, a pre-storage time of few days and a long dwell time at elevated temperature/pressure are required. For the hydrothermal treatment already heating the specimens up to 185 °C in saturated steam followed by an immediate cooling leads to a substantial increase in compressive strength. Pre-storage time did not affect the result as far as a minimum of several hours is guaranteed. The improved performance is due to an increase in the pozzolanic and hydraulic reaction. Surprisingly, tobermorite was only found within a very thin layer at the surface of the sample, but not in the bulk. Sulphate and aluminium stemming from the decomposition of the ettringite are bound in the newly formed phases hydroxylellestadite and hydrogarnet.

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Section: Uhpcmentioning

confidence: 99%

Thermal and hydrothermal treatment of UHPC: influence of the process parameters on the phase composition of ultra-high performance concrete

et al. 2021

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“…To date, many projects have incorporated UHPFRC, comprising either repairs or new designs (Doiron 2017). The market size of UHPFRC is expected to grow 7% annually between 2017 and 2023 due to distinct advantages of UHPFRC in applications where narrow formwork and dense reinforcement are inevitable, high-strength material is required and the surrounding environment is aggressive (Darling 2018).…”

Section: Introduction Of Uhpfrcmentioning

confidence: 99%

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

et al. 2021

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Recent developments in the area of Ultra-High-Performance Steel Fiber Reinforced Concrete (UHP-SFRC) enables reduction in steel reinforcement, and has led to enhanced ductility and toughness of structural components owing to its resilient tensile behaviour. This paper presents the results of an experimental study conducted to investigate the tensile behaviour of UHP-SFRC. Four commercial mixes and two in-house mixes were evaluated using the procedures prescribed in the 2018 edition of Annex 8.1 of CSA-S6. Tensile strength of UHP-SFRC was quantified and correlated through the direct tension test, splitting test, inverse analysis of four-point bending test using either code expressions or nonlinear finite element analysis, and a calibrated empirical expression that links this property to the cylinder compressive strength. In addition, the effect of important parameters on flexural strength including casting methodology, volumetric ratio of steel fibers, and aspect ratio (shear span to depth ratio) of bending prisms have been assessed.

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“…Xu et al [21] used UHPC mixed with polymer fiber to strengthen plain concrete beams by using a cast-in-place plain UHPC layer to reinforce their underside, greatly improving their bending capacity while inhibiting the development of cracks. Wu and Lin [22] evaluated the influence of U-shaped UHPC reinforcement over the failure mode, fracture strength, ultimate bearing capacity, and deformation of RC beams.…”

Section: Introductionmentioning

confidence: 99%

Full‐Scale Model Experimental Study of the Flexural Behavior of Hollow Slabs Strengthened by UHPC

Zhou

Wen

Wei-qi³

et al. 2021

Advances in Materials Science and Engineering

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The hollow slabs strengthened by ultrahigh performance concrete (UHPC) composite beam show many advantages over traditional reinforcement methods. In this paper, full-scale model load tests were carried out on an nonstrengthened prestressed concrete hollow slab and an UHPC-strengthened prestressed concrete hollow slab, comparing the load deflection, crack width, bearing capacity, deformation resistance, and self-vibration frequency of the two. Static loading experimental results indicate that UHPC enhances the overall performance of prestressed concrete hollow slabs by decreasing deflection and crack width and improving bearing capacity. The strengthening effects of UHPC on a prestressed concrete hollow slab’s flexural behavior are also discussed, such as deflection, crack width, bearing capacity, deformation resistance, self-vibration frequency, flexural behavior, and cracking load. Deflection and crack width under a load of 800 kN decreased by 45.8% and 56.3%, respectively, and the initial self-vibration frequency, ultimate bearing capacity, and cracking load increased 19.2%, 21.4%, and 50%, respectively. The plane assumption can be made generally throughout the overall test process while using UHPC strengthening, which significantly constrains crack width and improves stiffness and deformation capacity. The UHPC layer and the prestressed concrete hollow slab were connected by shear studs to produce a good composite action between them, and the bending performance and bearing capacity of the whole structure were clearly improved. In addition to experiments, a validated numerical model is developed to verify the flexural performance of hollow slab strengthened by UHPC.

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Pier Repair/Retrofit Using UHPC—Examples of Completed Projects in North America

Cited by 20 publications

References 0 publications

Thermal and hydrothermal treatment of UHPC: influence of the process parameters on the phase composition of ultra-high performance concrete

Thermal and hydrothermal treatment of UHPC: influence of the process parameters on the phase composition of ultra-high performance concrete

Tensile behaviour of ultra-high-performance steel fiber reinforced concrete

Full‐Scale Model Experimental Study of the Flexural Behavior of Hollow Slabs Strengthened by UHPC

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