Experimental and numerical study of the performance of ultra high performance fiber reinforced concrete for the flexural strengthening of full scale reinforced concrete members

Paschalis, Spyridon A.; Λαμπρόπουλος, Ανδρέας; Τσιούλου, Ουρανία

doi:10.1016/j.conbuildmat.2018.07.123

Cited by 123 publications

(51 citation statements)

References 15 publications

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“…The authors reported almost zero slip value at supports and the highest value of slipping was observed near the loading points. Finally, the experimentally tested beams were modeled numerically in ATENA software and the results show a good agreement with the experimental outputs [35].…”

Section: Flexural Behaviorsmentioning

confidence: 67%

Structural Strengthening/Repair of Reinforced Concrete (RC) Beams by Different Fiber-Reinforced Cementitious Materials - A State-of-the-Art Review

Bahij¹,

Omary²,

Feugeas³

et al. 2020

jcde

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In the last few decades, premature deterioration of reinforced concrete (RC) structures has become a serious problem because of severe environmental actions, overloading, design faults, and materials deficiencies. Therefore, repair and strengthening of RC elements in existing structures are very important to extend their service life. There are numerous methods for retrofitting and strengthening of RC structural components such as; steel plate bonding, external pre-stressing, section enlargement, fiber-reinforced polymer (FRP) wrapping, and so on. Although these modifications can successfully improve the load-bearing capacity of the beams, but they are still prone to corrosion damage resulting in failure of the strengthened elements. Therefore, many researchers used cementitious materials due to their low-cost, corrosion resistance, and resulted in the improvement of the tensile and fatigue behaviors. Different types of cementitious materials such as; fiber-reinforced concrete (FRC), high performance concrete (HPC), high strength concrete (HSC), ultra-high performance concrete (UHPC), steel fiber-reinforced high strength lightweight self-compacting concrete (SHLSCC), fabrics reinforced cementitious material (FRCM) and so on have been used to strengthen structural elements. This paper summarizes previously published research papers concerning the structural behaviors of RC beams strengthened by different cementitious materials. Shear behaviors, flexural characteristics, torsional properties, deflection, cracking propagation, and twisting angle of the strengthened beams are explained in the present paper. Finally, proper methods are proposed for strengthening RC beams under various loading conditions.

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Section: Flexural Behaviorsmentioning

confidence: 67%

Structural Strengthening/Repair of Reinforced Concrete (RC) Beams by Different Fiber-Reinforced Cementitious Materials - A State-of-the-Art Review

Bahij¹,

Omary²,

Feugeas³

et al. 2020

jcde

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show abstract

“…In the current study four different mixes were examined, one normal conventional concrete (NC) and three Ultra High-Performance Concrete (UHPC) mixes. UHPC mix design was based on a previous study [4] and three different volumetric percentages of steel fibres were examined (0%, 3% and 5%). All concrete mix designs are presented in Table 1.…”

Section: Preparation Of Uhpfrc and Testingmentioning

confidence: 99%

“…In the last few years, the use of novel high performance cementitious materials such as the Ultra High Performance Fibre Reinforced Concrete (UHPFRC) have been extensively studied for the structural upgrade of existing structures and it has been found that the use of UHPFRC can considerably increase the stiffness and strength of existing elements [4,5].…”

Section: Introductionmentioning

confidence: 99%

Restrained concrete shrinkage effect on Concrete Elements strengthened with UHPFRC layers

2019

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Ultra-High Performance Fibre Reinforced Concrete (UHPFRC) is a relatively new material with superior mechanical properties. Recent published studies have confirmed the beneficial contribution of the addition of UHPFRC layers for the structural upgrade of existing Reinforced Concrete (RC) elements.In case of structures strengthened with additional concrete elements, one of the crucial parameters for the performance and the durability of the strengthened elements is the restrained concrete shrinkage of the new material. The new concrete layer tends to shrink, but due to the connection with the existing structural elements, tensile stresses are induced to the new layers which may lead to the initiation of cracks, while slip is also induced at the old-to-new concrete interfaces. So far, there are not any published studies on the effect of restrained concrete shrinkage on composite UHPFRC-to-normal concrete elements. In this study, experimental work has been conducted on concrete prisms strengthened with UHPFRC layers. Shrinkage strain recordings have been conducted for the composite prisms alongside with relevant recordings for the free shrinkage measurements of standard UHPFRC prisms. The degree of restrained has been calculated and correlated with the induced stresses, and the beneficial contribution of the steel fibres has been highlighted. Flexural tests of the strengthened beams have also been conducted and the results show significant enhancement of the flexural performance of the examined specimens and very good connection between the new UHPFRC layer and the existing concrete substrate.

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“…Concrete reinforced with steel bars is traditionally used for the enhancement of the structural performance of deficient buildings [1]. Remarkable development has been achieved in the last decade in the use of novel high performance materials and especially Ultra High Performance Fibre Reinforced Concrete (UHPFRC) [2][3][4][5]. UHPFRC is a material with enhanced strength in tension and compression and significantly high energy absorption in the post crack region.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of reinforced concrete beams: RC versus UHPFRC layers

Λαμπρόπουλος

Τσιούλου

Paschalis

et al. 2021

IABSE Congress Reports

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Strengthening of Reinforced Concrete (RC) beams is of high importance for the structural upgrade of existing buildings. The majority of the existing RC structures need to be upgraded either because they are designed with old or without seismic code provisions or because of existing damages. In this study the effectiveness of the use of traditional RC layers is compared with the use of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) layers. Experimental investigation has been conducted on beams strengthened with these two techniques and the effectiveness of the examined methods has been evaluated via comparisons of the load-deflection and the interface slip results.

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Experimental and numerical study of the performance of ultra high performance fiber reinforced concrete for the flexural strengthening of full scale reinforced concrete members

Cited by 123 publications

References 15 publications

Structural Strengthening/Repair of Reinforced Concrete (RC) Beams by Different Fiber-Reinforced Cementitious Materials - A State-of-the-Art Review

Structural Strengthening/Repair of Reinforced Concrete (RC) Beams by Different Fiber-Reinforced Cementitious Materials - A State-of-the-Art Review

Restrained concrete shrinkage effect on Concrete Elements strengthened with UHPFRC layers

Strengthening of reinforced concrete beams: RC versus UHPFRC layers

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