Effect of Surface Roughness on the Steel Fibre Bonding in Ultra High Performance Concrete (UHPC)

Stengel, Thorsten

doi:10.1007/978-3-642-00980-8_50

Cited by 28 publications

(11 citation statements)

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“…Examples range (i) from UHPC (Ultra-High-Performance Concrete, e.g. Lehmann & Fontana, 2009;Stengel, 2009) to CHHC (Carbon Hedge Hog Cement, e.g. Cwirzen et al, 2009), (ii) from autoclaved aerated concrete (Laukaitis, Kerienė, Kligys, Mikulskis, & Lekūnaitė, 2012) to self-compacted lightweight concrete (Madandoust, Ranjbar, & Yasin Mousavi, 2011) and, still, (iii) from calcium-leached cement-based materials (Bernard, Ulm, & Germaine, 2003) to recycled aggregates concrete (Li, Xiao, Sun, Kawashima, & Shah, 2012).…”

Section: Nanotechnology and Concrete -General Aspectsmentioning

confidence: 99%

Review on concrete nanotechnology

Silvestre

Brito

2015

European Journal of Environmental and Civil Engineering

175

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Section: Nanotechnology and Concrete -General Aspectsmentioning

confidence: 99%

Review on concrete nanotechnology

Silvestre

Brito

2015

European Journal of Environmental and Civil Engineering

175

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“…Nowadays, nanotechnology has an enormous impact in different fields and industries. Some of them are food and agricultural [3,4], oil and gas [2,[5][6][7][8][9], paint and coating [10,11], construction [12], medicine [13], cosmetics [14], and wastewater treatment [15]. Nanotechnology in the upstream oil and gas industry has been used to improve the performance of fracturing fluids, improve cement properties, reduce the loss of drilling fluids and enhance wellbore stability, prevent scale deposition, and improve oil recovery.…”

Section: Introductionmentioning

confidence: 99%

New Nanohybrid Based on Hydrolyzed Polyacrylamide and Silica Nanoparticles: Morphological, Structural and Thermal Properties

et al. 2020

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In this study, a set of advanced characterization techniques were used to evaluate the morphological, structural, and thermal properties of a novel molecular hybrid based on silica nanoparticles/hydrolyzed polyacrylamide (CSNH-PC1), which was efficiently obtained using a two-step synthetic pathway. The morphology of the nanohybrid CSNH-PC1 was determined using scanning electron microscopy (SEM), dynamic light scattering (DLS), and nanotracking analysis (NTA) techniques. The presence of C, N, O, and Si atoms in the nanohybrid structure was verified using electron dispersive scanning (EDS). Moreover, the corresponding structural analysis was complemented using powder X-ray diffraction (XRD) and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FT-IR). The covalent bond between APTES-functionalized SiO2 nanoparticles (nSiO2-APTES), and the hydrolyzed polyacrylamide (HPAM) chain (MW ≈ 20.106 Da) was confirmed with high-resolution X-ray spectroscopy (XPS). Finally, the thermal properties of the nanohybrid were evaluated by using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The results showed that the CSNH-PC1 has a spherical morphology, with sizes between 420–480 nm and higher thermal resistance compared to HPAM polymers without modification, with a glass transition temperature of 360 °C. The integration of these advanced characterization techniques implemented here shows promising results for the study and evaluation of new nanomaterials with multiple applications.

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“…The deformation along fibre length provide a mechanical bond contribution along the fibre such as in crimped, indented or polygonal twisted fibres whereas the deformation at the fibre end increases the mechanical bond such as paddles, buttons or hooks fibres. Chan and Chu (2004), Markovic (2006), andStengel (2009) studied the behaviour of steel fibres embedded in UHPC. Wille and Naaman (2012b) developed Fig.…”

Section: Effect Of Fibres On Concrete Propertiesmentioning

confidence: 99%

Structural behaviour of ultra high performance fibre reinforced concrete composite members

Hussein¹

2021

Preprint

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The aging and deterioration of reinforced concrete infrastructures in North America present major technical and economical challenges to infrastructure owners. To effectively address some of the challenges, there is a need to develop innovative and cost-effective systems. The main objective of this research was to develop composite members of ultra-high performance fibre reinforced concrete and normal strength concrete or high strength concrete (UHPFRC-NSC/HSC). In order to achieve this objective, the first phase of this research investigates the structural behaviour of UHPFRC with varying fibre content beams without web reinforcement. Test results indicated that the addition of 1% of steel fibres effectively improves the shear strength of UHPC beams by 77% due to the crack-bridging stress that develops across the crack surface. In the second phase, experimental studies were carried out on UHPFRC-NSC/HSC prisms and beams without stirrups to investigate the flexural and shear capacity of those composite members. Each beam specimen was designed to have the UHPFRC layer in tension and the NSC/HSC layer in compression. Additional varied parameters included fibre volume content, and shear connectors were investigated. Test results showed that the performance of the proposed composite system in terms of the flexural and shear capacity was successfully enhanced. All composite beams failed in shear at a force that is 1.6 to 2.0 times higher than that of the NSC/HSC beam's resistance. Test results showed that the effect of using HSC versus NSC in the composite beam was negligible, and the bond strength between the two concrete material layers (UHPFRC and NSC/HSC) was significantly high that the addition of shear connectors was unnecessary. In the third phase, an analytical and finite element models to predict the ultimate shear capacity of UHPFRC composite beams were proposed and validated with the experimental results. The results of the finite element analysis showed that the size effect in structures made of UHPFRC material has little influence on the shear capacity. Finally a comparison between the finite element model and the analytical model indicated that both models developed in this research are capable of predicting the shear behaviour of UHPFRC and UHPFRC-NSC/HSC beams.

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Effect of Surface Roughness on the Steel Fibre Bonding in Ultra High Performance Concrete (UHPC)

Cited by 28 publications

References 1 publication

Review on concrete nanotechnology

Review on concrete nanotechnology

New Nanohybrid Based on Hydrolyzed Polyacrylamide and Silica Nanoparticles: Morphological, Structural and Thermal Properties

Structural behaviour of ultra high performance fibre reinforced concrete composite members

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