Microstructure related mechanical behaviors of short-cut super-fine stainless wire reinforced reactive powder concrete

Han, Baoguo; Dong, Sufen; Ou, Jinping; Zhang, Chenyu; Wang, Yanlei; Yu, Xun; Ding, Siqi

doi:10.1016/j.matdes.2016.02.004

Cited by 73 publications

(23 citation statements)

References 27 publications

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“…The mixing process of SSW reinforced RPC was the same as that referred to in references [18] and [19]. In order to acquire the middle notch during casting of beams, a 10 mm or 20 mm height flat steel plate having a 3 mm thickness was prepositioned at the middle of the molds.…”

Section: Specimens Preparationmentioning

confidence: 99%

“…It is also noted that SSWs have thermal expansion coefficient similar to that of concrete matrix and high tensile strength. Moreover, SSWs have good dispersion in concrete and can form widely distributed strengthening and toughening network at low content [18][19][20][21]. The compactness improvement of concrete matrix caused by SSWs can effectively inhibit the generation of cracks.…”

Section: Introductionmentioning

confidence: 99%

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Flexural toughness and calculation model of super-fine stainless wire reinforced reactive powder concrete

Dong

Zhou

Ashour

et al. 2019

Cement and Concrete Composites

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As a type of excellent reinforcing filler, super-fine stainless wire (SSW) can form widely distributed network in reactive powder concrete (RPC) to transfer crack tip stresses as well as inhibit the initiation and propagation of cracks, leading to significant improvement of flexural toughness of RPC. In this paper, the flexural toughness of RPC beams and plates reinforced with 1% and 1.5% by vol. of SSWs was investigated, and its calculation model was established according to the composite material theory. Experimental results showed that the flexural toughness of unnotched beams fabricated with RPC containing 1.5% SSWs is 146.5% higher than that of control RPC without SSWs according to load-deflection relationships. The equivalent flexural strength of notched RPC beams is enhanced by 80.0% as SSW content increases from 1% to 1.5%. The limitation ability of SSWs on crack mouth opening can be used to evaluate the flexural toughness of composites. An addition of 1.5% SSWs leads to 201.9% increase of flexural toughness of RPC plates in accordance with load-deflection relationships. The calculation model based on the composite material theory can accurately describe the toughening effect of SSWs on RPC beams and plates. The enhancement of flexural toughness of RPC caused by SSWs is beneficial for improving the safety of structures as well as broadening the engineering applications of composites.

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Section: Specimens Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flexural toughness and calculation model of super-fine stainless wire reinforced reactive powder concrete

Dong

Zhou

Ashour

et al. 2019

Cement and Concrete Composites

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is achieved using ultrafine constituents and reactive powders which improve the mechanical properties and durability, yet increases the brittleness [1,2]. For enhancement of the ductility properties, steel fibres are particularly attractive as concrete constituents [2][3][4]. These also can contribute to reducing the amount and congestion of conventional reinforcement in RC elements [4,5] and are widely used in practice in tunnel linings, industrial floor slabs and aircraft runways.…”

Section: Introductionmentioning

confidence: 99%

Ultimate shear response of ultra-high-performance steel fibre-reinforced concrete elements

Ţibea¹,

Bompa

2020

Archiv.Civ.Mech.Eng

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This paper examines the experimental performance of ultra-high-performance steel fibre-reinforced concrete (UHPSFRC) beams subjected to loads at relatively low shear span-to-depth ratios. The results and observations from six tests provide a detailed insight into the ultimate response including shear strength and failure mode of structural elements incorporating various fibre contents. The test results showed that a higher fibre content results in an increase in ultimate capacity and some enhancement in terms of ductility. Detailed nonlinear numerical validations and sensitivity studies were also undertaken in order to obtain further insights into the response of UHPSFRC beams, with particular focus on the influence of the shear span-to-depth ratio, fibre content and flexural reinforcement ratio. The parametric investigations showed that a reduction in shear span-to-depth ratio results in an increase in the member capacity, whilst a reduction in the flexural reinforcement ratio produces a lower ultimate capacity and a relatively more flexible response. The test results combined with those from numerical simulations enabled the development of a series of design expressions to estimate the shear strength of such members. Validations were performed against the results in this paper, as well as against a collated database from previous experimental studies.

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“…In order to differ from the commonly used steel fiber of RPC, this kind of micro stainless/steel fiber having comparative diameter and length with carbon fibers is called short-cut super-fine stainless/steel wire. Research results indicate that the short-cut super-fine stainless wire (SSSW) can effectively improve the mechanical properties of RPC [36]. However, the research about the functional properties of SSSW reinforced RPC has not been carried out.…”

Section: Introductionmentioning

confidence: 99%

Electrically conductive behaviors and mechanisms of short-cut super-fine stainless wire reinforced reactive powder concrete

Dong

Han

et al. 2016

Cement and Concrete Composites

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135

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The incorporation of shortcut super-fine stainless wire (SSSW) is an effective way to improve the electrically conductive and self-sensing capability of reactive powder concrete (RPC) composed of cement, silica fume, fly ash and silica sand. The conductive characteristics of SSSW reinforced RPC and their responses to external loading are investigated. The conductive mechanisms are revealed through electrochemical impedance spectroscopy and intrinsic conductivity analysis. The results show that the percolation occurs and polarization disappears in SSSW reinforced RPC containing 0.5 vol.% of SSSW in diameter of 20 μm, and the electrical resistivity of which measured by using four-electrode-DC method drops to 44 Ω•cm from 20.8×10 4 Ω•cm. The gauge factor of RPC reinforced with SSSW in diameter of 8 μm can reach up to 22.5, 94.9 and 43.6 under cyclic compression, monotonic compression and flexure, respectively. The conductivity of SSSW reinforced RPC mainly depends on the formation of SSSW conductive network.

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Microstructure related mechanical behaviors of short-cut super-fine stainless wire reinforced reactive powder concrete

Cited by 73 publications

References 27 publications

Flexural toughness and calculation model of super-fine stainless wire reinforced reactive powder concrete

Flexural toughness and calculation model of super-fine stainless wire reinforced reactive powder concrete

Ultimate shear response of ultra-high-performance steel fibre-reinforced concrete elements

Electrically conductive behaviors and mechanisms of short-cut super-fine stainless wire reinforced reactive powder concrete

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