Flexural behavior of UHPC joints for precast UHPC deck slabs

Qiu, Minghong; Shao, Xudong; Yan, Banfu; Zhu, Yanping; Chen, Yanliang

doi:10.1016/j.engstruct.2021.113422

Cited by 35 publications

(9 citation statements)

References 23 publications

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“…To calculate the total environmental impact associated with designing a column with each mixture listed in table 3, equation ( 8) from section 2.2 is used. To maintain the focus of this work, equation ( 8) is calculated considering the contributions of concrete alone 5 . Similarly, the total cost is calculated using equation ( 8) by substituting i c with u c .…”

Section: Multi-objective Density Diagrams (Modds) For Sustainable Cos...mentioning

confidence: 99%

Multi-criteria comparison tools to evaluate cost- and eco-efficiency of ultra-high-performance concrete

Tavares,

Skillen,

Shi

et al. 2023

Environ. Res.: Infrastruct. Sustain.

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This work was motivated by the increasing need for proper metrics and tools to demonstrate the effect of mechanical performance, as a function of concrete mix composition, in dictating the dimensions of structural elements and associated costs and embodied carbon dioxide (CO2) emissions. Mixture compositions associated with different concrete technologies were compared using multi-criteria comparison indices derived using structural design considerations and calculated using information on compressive strength, volumetric embodied CO2 and unit costs. In addition, predicted compressive strengths obtained with machine learning (ML) models are used to calculate these indices for a domain of mix proportions associated with ultra-high-performance concrete materials to generate multi-objective density diagrams (MODDs). The makeup of this tool facilitates the evaluation of rather complicated trends associated with mix proportions and multi-objective outcomes, allowing ML-based tools to be of easy interpretation by industry personnel with no expertise in artificial intelligence. MODDs could be used as aids in the decision-making process during mix design stages and serve as proof of mixture optimization that could be introduced in Environmental Product Declarations. Results show that, in contrast to conventional wisdom, high-binder content and ultra-high strength concrete technologies are not necessarily detrimental to cost and/or eco efficiencies. For the applications evaluated herein, optimum solutions were mostly obtained with these types of concrete, suggesting that industry trends toward requiring minimization of embodied carbon footprint on a per volume of concrete basis are misguided and should not be used as a standalone metric to minimize the total carbon footprint of concrete structures.

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Section: Multi-objective Density Diagrams (Modds) For Sustainable Cos...mentioning

confidence: 99%

Multi-criteria comparison tools to evaluate cost- and eco-efficiency of ultra-high-performance concrete

Tavares,

Skillen,

Shi

et al. 2023

Environ. Res.: Infrastruct. Sustain.

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“…24,25 UHPC designed by the densified particle packing method exhibits high compressive and tensile strengths, elastic modulus, low shrinkage and creep after hightemperature curing, and high durability. [26][27][28][29] In particular, well-mixed steel fibers improve the tensile strength of UHPC, reduce the initiation of cracks, restrain the propagation of cracks, and improve ductility. 30,31 Also, steel fibers enhance the bond strength between rebar and UHPC, and their contribution to bond strength increases with fiber content increasing.…”

Section: Research Significancementioning

confidence: 99%

“…Although the UHPC is more expensive than conventional grouting material, it is still attractive to be used because the rebar anchoring length might be significantly reduced due to its excellent mechanical properties and high bond strength to the rebar 24,25 . UHPC designed by the densified particle packing method exhibits high compressive and tensile strengths, elastic modulus, low shrinkage and creep after high‐temperature curing, and high durability 26–29 . In particular, well‐mixed steel fibers improve the tensile strength of UHPC, reduce the initiation of cracks, restrain the propagation of cracks, and improve ductility 30,31 .…”

Section: Research Significancementioning

confidence: 99%

Tensile and flexural tests on ultrahigh performance concrete grouted sleeve connection

Qiu

Shao

Zhu

et al. 2022

Structural Concrete

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Connections in the assembled precast elements become essential locations for creating structural continuity. However, the construction challenges of conventional steel sleeve connections, such as rebar embedment length, rebar congestion, and formed grout defects (i.e., voids), are still a concern area for researchers and engineers. In this study, a proposed ultrahigh performance concrete (UHPC) grouted sleeve connection was presented for assembled precast elements, which might reduce defects, enhance durability, and accelerate structure construction. The tensile test of grouted sleeve connection with different grouting materials, rebar diameters, and anchoring lengths was conducted to determine an optimal anchoring length used in the flexural design.The precast specimens with the UHPC grouted sleeve connection were tested under flexural load. Also, strain changes in concrete, sleeve, and rebar were reported in tensile and flexural tests. The tensile test results showed two types of failure modes, the rebar rupture and bond failure between rebar and grouting. The recommended rebar anchoring length in the flexural design was six times the rebar diameter. The flexural test results showed that the precast specimen with or without the shear key has a similar failure mode as compared to the cast-in-place specimen, while their average cracking load, yield load, and ultimate load were 27.9%, 11.0%, and 7.4%, respectively, which is less than those of the cast-in-place specimen. Also, the flexural cracking resistance was the highest in the sleeve segment, followed by the joint region and the rebar segment. This study provides a reference for the design of the UHPC grouted sleeve connection for assembled precast elements.

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“…[13][14][15] In the field of bridge engineering, engineers and researchers have explored various cross-sectional forms utilizing UHPC, including steel-UHPC composite beams and UHPC box-section beams. [16][17][18][19][20][21][22] The T-shaped section offers distinct advantages over simple rectangular or square beams. The top flange of the T-shape increases the moment of inertia, providing higher bending strength and torsional resistance.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and optimal design of UHPC T‐shaped beam

Deng,

Huang,

Yan

et al. 2024

Structural Concrete

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In this paper, the ordinary reinforced UHPC T‐shaped beam, steel plate reinforced UHPC T‐shaped beam and prestressed UHPC T‐shaped beam were compared by conducting the flexure test. The vertical displacement, crack development, strain change, and crack resistance were discussed. The steel plate reinforced UHPC T‐shaped beam shown better cracking resistance and mechanical properties. Based on the research, the multi‐scale finite element model of the steel plate reinforced UHPC T‐shaped beam was established, and the influence parameters were analyzed. The beam height, steel plate thickness and web thickness shown great influence on the ultimate bearing capacity of the beam. The bearing capacity calculation formulas of the steel plate reinforced UHPC T‐shaped beam based on the plastic strengthening model of the steel were proposed. The calculation results shown good agreement with the test value.

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Flexural behavior of UHPC joints for precast UHPC deck slabs

Cited by 35 publications

References 23 publications

Multi-criteria comparison tools to evaluate cost- and eco-efficiency of ultra-high-performance concrete

Multi-criteria comparison tools to evaluate cost- and eco-efficiency of ultra-high-performance concrete

Tensile and flexural tests on ultrahigh performance concrete grouted sleeve connection

Experimental study and optimal design of UHPC T‐shaped beam

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