Fiber content and curing time effect on the tensile characteristics of ultra high performance fiber reinforced concrete

Paschalis, Spyridon A.; Λαμπρόπουλος, Ανδρέας

doi:10.1002/suco.201600075

Cited by 36 publications

(19 citation statements)

References 16 publications

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“…The effect of different type, length and volume fraction of fibres on the mechanical properties of UHPFRC has been examined by a number of researchers [ 5 , 6 , 7 , 8 , 9 , 10 , 11 ]. Paschalis and Lampropoulos [ 5 ] found that an increase in the steel fibre content from 1 to 6 Vol.-% enhanced the tensile strength by 92% and the compressive strength by 72%.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Size Effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC)

et al. 2021

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In the last few years, there has been increasing interest in the use of Ultrahigh-Performance Fibre-Reinforced Concrete (UHPFRC) layers or jackets, which have been proved to be quite effective in strengthening applications. However, to facilitate the extensive use of UHPFRC in strengthening applications, reliable numerical models need to be developed. In the case of UHPFRC, it is common practice to perform either direct tensile or flexural tests to determine the UHPFRC tensile stress–strain models. However, the geometry of the specimens used for the material characterization is, in most cases, significantly different to the geometry of the layers used in strengthening applications which are normally of quite small thickness. Therefore, and since the material properties of UHPFRC are highly dependent on the dimensions of the examined specimens, the so called “size effect” needs to be considered for the development of an improved modelling approach. In this study, direct tensile tests have been used and a constitutive model for the tensile behaviour of UHPFRC is proposed, taking into consideration the size of the finite elements. The efficiency and reliability of the proposed approach has been validated using experimental data on prisms with different geometries, tested in flexure and in direct tension.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Size Effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC)

et al. 2021

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“…The use of UHPFRC could improve durability, ductility and resistance of strengthened RC structures due to its superior mechanical properties. There are several published studies on the mechanical properties of UHPFRC material …”

Section: Introductionmentioning

confidence: 99%

“…There are several published studies on the mechanical properties of UHPFRC material. [8][9][10][11][12][13][14][15][16][17] Paschalis and Lampropoulos 8 investigated the effect of fiber content, cement type and curing time on the tensile and compressive characteristics of UHPFRC material. Results showed that use of 52.5 N type I cement instead of 32.5 R type II cement resulted in 18% higher tensile strength and 16% higher compressive strength.…”

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confidence: 99%

Shear strengthening of reinforced concrete beams using prefabricated ultra‐high performance fiber reinforced concrete plates: Experimental and numerical investigation

Sakr

Sleemah

Khalifa

et al. 2019

Structural Concrete

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This paper presents the efficiency of using prefabricated ultra‐high performance fiber reinforced concrete (UHPFRC) plates in shear strengthening of reinforced concrete (RC) beams experimentally and numerically using finite element method. In order to ensure high quality and facilitate the strengthening process on site applications, it has been considered to apply UHPFRC as a plate pasted on concrete surface using epoxy. Tested specimens included four strengthened beams besides three control beams. Strengthening the RC beams was based on the use of two different techniques; (a) one longitudinal side strengthening (b) two longitudinal sides strengthening. Moreover, strengthening RC beams with reinforced or non‐reinforced prefabricated UHPFRC plates was also investigated. Results show that UHPFRC plates significantly increased the maximum load capacity, ductility and mid span reinforcement strain of the strengthened RC beams comparing with reference beam failed in shear. Also, steel connectors used in reinforcement of UHPFRC plates prevented debonding failure mode. A three‐dimensional (3D) finite element model (FEM) of the tested beams was also developed to predict the behavior of these specimens strengthened in shear. The adhesive layer was simulated using cohesive surface model to consider the slippage between concrete surface and UHPFRC plates. Results of the FEM showed good agreement with experimental results, as they were able to predict the behavior of the beams with high accuracy.

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“…In this study, different parameters which affect the strength and the workability of UHPFRC have been investigated and an optimum mixture design was proposed. Paschalis and Lampropoulos (2017), investigated the tensile characteristics of UHPFRP for different curing regimes and different fiber contents. Based on the results, different stress-strain models for the different fiber contents have been proposed, while an optimum curing period for the UHPFRC has been suggested.…”

Section: Introductionmentioning

confidence: 99%

Ultra high performance fiber reinforced concrete as strengthening material

Paschalis¹

2019

Sustainable Construction Materials and Technologies (SCMT)

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The safety of structures is of high importance affecting people's lives. Structural evaluation, and possibly intervention, is considered necessary for old structures, structures which have been affected by accidental actions and also for structures in high seismic risk areas. Research should now focus on the development of new sustainable techniques which increase the safety of existing structures, and at the same time minimize the necessary to build new structures and to consume new materials and resources. The present research investigates the effectiveness of an advanced material, such as Ultra High Performance Fiber Reinforced Concrete (UHPFRC), for the strengthening of existing Reinforced Concrete (RC) structures. For this reason, an extensive experimental study on the properties of the material and the application for strengthening of RC beams has been conducted. More specifically, parameters such the effect of fiber content on the performance, the workability and the cost of the material have been investigated first. Based on the analysis, an optimum mixture design has been selected and has been applied for strengthening of RC beams using different configurations. The results indicated that the strengthening with UHPFRC is a well promising technique and the performance of the strengthened elements has been increased in all the examined cases.

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Fiber content and curing time effect on the tensile characteristics of ultra high performance fiber reinforced concrete

Cited by 36 publications

References 16 publications

Experimental and Numerical Investigation on the Size Effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC)

Experimental and Numerical Investigation on the Size Effect of Ultrahigh-Performance Fibre-Reinforced Concrete (UHFRC)

Shear strengthening of reinforced concrete beams using prefabricated ultra‐high performance fiber reinforced concrete plates: Experimental and numerical investigation

Ultra high performance fiber reinforced concrete as strengthening material

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