Application of high‐performance fibre reinforced concrete to precast girders for road bridges: Conceptual considerations and numerical analyses

Ruiz, Rafael; Todisco, Leonardo; Corres, Hugo

doi:10.1002/suco.202200907

Cited by 5 publications

(1 citation statement)

References 39 publications

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“…One of the primary reasons for the occurrence of cracks in the 0# block box girder of continuous rigid frame bridges is early concrete shrinkage cracks. To mitigate the formation of early shrinkage cracks in the 0# block box girder, some researchers have incorporated fiber-reinforced concrete into the girders, with results showing a significant inhibitory effect on crack formation [27][28][29]. Kasu et al [30] studied the flexural strength of concrete containing polyester ultra-fine fibers under static loads.…”

Section: Introductionmentioning

confidence: 99%

A Study of the Mechanical Properties of Polyester Fiber Concrete Continuous Rigid Frame Bridge during Construction

Miao,

Zhan,

Yuan

et al. 2023

Buildings

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This study investigates the mechanical performance of a polyester fiber concrete continuous rigid frame bridge during construction and the spatial stress distribution of the 0# block box girder, with a focus on the backdrop of the bridge in Pipa Zhou, Jiangxi Province. Stress monitoring at critical cross-sections during bridge construction was combined with FE simulations to analyze the stress and alignment deviation variations along the cantilevered construction process of the bridges. Subsequently, after validating the accuracy of the whole bridge model, the actual internal force of the box girder cross-section was extracted to act on the 0# block box girder solid model, and the spatial force of the 0# block box girder under the state of maximal cantilever and the completed bridge was further investigated. The results indicate that during cantilever construction, the top, and bottom plates of the box girder were subjected to compression, with the bottom plates having relatively low compression stress close to the critical values for compression and tension. Attention should be paid to controlling tensile stress application. After reaching a quarter of the bridge’s span in construction, the alignment deviation of the main beam increases, necessitating enhanced monitoring and adjustments of the main beam elevation. Furthermore, FE analysis shows that under maximum cantilever and the completed bridge states, the stress variations of the top and bottom plates of the 0# block box girder remain consistent, with the top plate stress varying by no more than 2.5 MPa and the bottom plate stress varying by approximately 1 MPa. Moreover, the 0# block box girder shrinkage cracks were mainly located in the bottom and web plate, and the number of cracks in the 0# block box girder with polyester fibers was reduced compared to the cracks in the ordinary concrete box girder.

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Section: Introductionmentioning

confidence: 99%

A Study of the Mechanical Properties of Polyester Fiber Concrete Continuous Rigid Frame Bridge during Construction

Miao,

Zhan,

Yuan

et al. 2023

Buildings

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Experimental characterization of a cost‐competitive tailor‐made HPFRC mix design for wide application in precast girder of roadway bridges

Ruiz,

Chozas‐Ligero,

Todisco

et al. 2024

Structural Concrete

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This paper presents a comprehensive study on the development of a cost‐effective, high‐performance fiber reinforced concrete (HPFRC) for the construction of a 60 m‐span U‐girder roadway bridge without stirrups in the webs, meeting the design requirements of fck ≥ 100 MPa and the post‐cracking flexural strength fR3k ≈ 8–10 MPa. The main objective of this research is to develop a F5 workability class HPFRC that meets the specified design criteria without exceeding 2.5–3.0 times the cost of a C70/85. To achieve this goal, the concrete mix was obtained using 500 kg/m3 of cement and 50 kg/m3 of silica fume. This mix was investigated with nine different combinations of fibers and fiber contents, resulting that 80 kg/m3 of 4D‐fibers (lf = 60 mm) provided the optimal fR3k without compromising workability and cost. Subsequently, an extensive experimental campaign was conducted to cast the U‐girder following the conventional casting techniques involving casting prismatic samples, L‐shaped and rectangular‐shaped panels to represent different parts of the U‐girder. Innovative techniques were used to study the effect of different waiting times between concrete pours. Results from the testing of the prismatic specimens evidenced the need of stitching by means of a poker vibrator planes between successive concrete layers. Furthermore, the study of the panels evidenced that a waiting time of 90 min allows the HPFRC to achieve enough bending and compressive strength to bear internal vibration of the element without liquefying and, at the same time, avoiding cold joints. The results confirm the applicability of the developed HPFRC for the structural element under study following conventional casting techniques.

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Reducing Embodied Carbon and Enhancing Performance in Bridge Construction Using High-Performance Steel Fibre Reinforced Concrete

Ruiz,

Todisco,

Vera-Agullo

et al. 2024

Lecture Notes in Civil Engineering

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Application of high‐performance fibre reinforced concrete to precast girders for road bridges: Conceptual considerations and numerical analyses

Cited by 5 publications

References 39 publications

A Study of the Mechanical Properties of Polyester Fiber Concrete Continuous Rigid Frame Bridge during Construction

A Study of the Mechanical Properties of Polyester Fiber Concrete Continuous Rigid Frame Bridge during Construction

Experimental characterization of a cost‐competitive tailor‐made HPFRC mix design for wide application in precast girder of roadway bridges

Reducing Embodied Carbon and Enhancing Performance in Bridge Construction Using High-Performance Steel Fibre Reinforced Concrete

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