Round-robin analysis of the RILEM TC 162-TDF beam-bending test: Part 2—Approximation of δ from the CMOD response

Barr, B.; Lee, M. M.; Hansen, Ernst Jan de Place; Dupont, David; Erdem, Emre; Schaerlaekens, S.; Schnütgen, B.; Stang, Henrik

doi:10.1007/bf02483282

Cited by 28 publications

(12 citation statements)

References 3 publications

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“…An influence of fibre type and fibre content on the slope values was not observed in this study. This finding is consistent with other research by Barr et al (2003) who reported that the ä-CMOD relationship was independent of fibre content and concrete strength. Compared with the theoretical value (0 .…”

Section: Relationship Between Mid-span Deflection and Cmodsupporting

confidence: 95%

Deflection–crack mouth opening displacement relationship for concrete beams with and without fibres

Zhao

Sun

Lange

2015

Magazine of Concrete Research

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The three-point bending (TPB) test of a notched beam is a method widely used to characterise the toughness of fibre reinforced concrete (FRC) in terms of fracture energy. However, since the measurement of deflection is significantly dependent on the test set-up, spurious deflections are sometimes obtained. Therefore, it is necessary to correlate deflection with crack mouth opening displacement (CMOD) so that the fracture energy can be evaluated from load-CMOD data. In this study, TPB tests were carried out on a series of beam specimens prepared with plain concrete, FRC and ultrahigh-performance concrete (UHPC). Load, deflection and CMOD were recorded. The results showed that a trilinear relationship could be established between deflection and CMOD. The FRC beams showed slightly higher deflection/CMOD ratios than the plain concrete beams, while a dependency of deflection/CMOD ratios on the fibre type or fibre content was not observed. Moreover, the trilinear relationship cannot apply to UHPC due to deflectionhardening and multiple-cracking behaviour.

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Section: Relationship Between Mid-span Deflection and Cmodsupporting

confidence: 95%

Deflection–crack mouth opening displacement relationship for concrete beams with and without fibres

Zhao

Sun

Lange

2015

Magazine of Concrete Research

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“…The new standard represents an improvement but there are still some problems when it is applied to materials exhibiting deflection-hardening behaviour (Kim et al 2008;Skazlić, Bjegović 2009). Barr and Lee (2003a, b) conducted a round robin test programme on the beam bending test recommended by RILEM TC 162-TDF. They found the recommended test is a good and robust testing system, although some minor inter-lab variations do occur.…”

Section: Test Methodsmentioning

confidence: 99%

Positive Interaction of Industrial and Recycled Steel Fibres in Fibre Reinforced Concrete

Bjegović

Baričević

Lakušić

et al. 2014

Journal of Civil Engineering and Management

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Abstract. In line with current "green" transport initiatives, Croatia plans to build over the next investment period a high speed railway line which will connect central Croatia and its capital with coastal regions of the country. According to design documents, the track system will be built using ballastless concrete solutions. In the scope of the project "Concrete track system -ECOTRACK", researchers from the University of Zagreb -Faculty of Civil Engineering analysed a new material, i.e. the rubberized hybrid fibre reinforced concrete (RHFRC), in order to find out whether its properties are adequate for the proposed concrete track system. The RHFRC contains by-products from mechanical recycling of waste tyres (rubber and steel fibres). The study of fibre and rubber interaction and their contribution to mechanical properties of the fibre reinforced concrete is presented, as extensive research on positive interaction between industrial and recycled steel fibres has not as yet been made. The results show that the RHFRC is an innovative, sustainable and cost-effective concrete, which is fully compliant with criteria prescribed in relevant standards.Keywords: fibre reinforced concrete, industrial steel fibres, recycled steel fibres, mechanical properties, recycled rubber, waste tyre.

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“…RILEM recommendation TC162-TDF [28] has been backed by several research centers that investigated deflection variability using the crack mouth opening displacement (CMOD) and fiber distribution in particular sample sections [29][30][31]. Toughness indexes were recommended (equivalent flexural tensile strength-f eq and residual flexural tensile strength-f R ) to define amelioration after cracking for fiber-reinforced UHPC [32,33].…”

Section: Uhpcmentioning

confidence: 99%

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

Smarzewski

Barnat-Hunek

2017

Int J Civ Eng

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early 1990s [1]. UHPC is characterized by a compressive strength above 120 MPa and high durability [2]. At present, some limitations remain regarding the use of standard concrete, such as its low tensile strength and ductility; however, it is possible that ultra-high-performance concrete reinforced with hybrid fibers can overcome these limitations. The main advantages of the UHPC mixture are: low values of water/binder ratio, the elimination of coarse aggregate, namely, the use of only fine aggregate, a limited amount of fine aggregate, and a packing density in which the grains fill the voids [3]. Besides utilizing a water-reducing agent, an addition of silica fume in UHPC mixtures is recommended to improve the workability [1,4] as silica fume has a diameter small enough to fill the interstitial voids between the cement and quartz sand particles. What is more, to reduce labor costs and provide architects and designers greater architectural freedom in structural member shapes and forms, it is advisable to either to reduce or completely eliminate the implementation of steel reinforcement bars. Nonetheless, the drawbacks of UHPC are that, on the whole, it is expensive and cannot substitute standard concrete in the majority of applications [5]. It is due to the composition of its mixtures that make the UHPC microstructure different from ordinary concrete. For UHPC at W/C = 0.20, its capillary pores become discontinuous when only 26% of the cement has been hydrated, instead of 54% for HPC, where W/C = 0.33 [1,6]. The pore size of UHPC basically varies between 2 and 3 nm, and its total porosity is 2.23% [1]. Studies on UHPC have been carried out by several researchers; nevertheless, the information on UHPC materials and structural properties is still rather lacking. A great deal of this research has revealed that a combination of steel-polypropylene fibers in concrete could take advantage of the material properties of both the fibers to Abstract The purpose of this study was to determine the effect of steel/polypropylene hybrid fibers on the mechanical properties and microstructure of ultra-highperformance concrete (UHPC). Tests were carried out on UHPC without and with fibers (steel and/or polypropylene in amounts of 0.25-1%). In this study, granite or granodiorite coarse aggregate with a grain size of about 2/8 mm was employed. The three-point bending tests displayed prolonged post-peak softening behavior. In addition, increasing the content of polypropylene fibers reduced the fracture energy. Moreover, the SEM results illustrated that adding a certain amount of fibers to concrete considerably changes the microstructure. It was observed that the smallest microcracks in the interfacial transition zone between the paste and aggregate occurred in the concrete containing steel fibers.

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Round-robin analysis of the RILEM TC 162-TDF beam-bending test: Part 2—Approximation of δ from the CMOD response

Cited by 28 publications

References 3 publications

Deflection–crack mouth opening displacement relationship for concrete beams with and without fibres

Deflection–crack mouth opening displacement relationship for concrete beams with and without fibres

Positive Interaction of Industrial and Recycled Steel Fibres in Fibre Reinforced Concrete

Property Assessment of Hybrid Fiber-Reinforced Ultra-High-Performance Concrete

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