Relationship between workability and mechanical properties of fibre-reinforced self-consolidating mortar

Mehdipour, Iman; Vahdani, Mohammad; Libre, Nicolas Ali; Shekarchi, Mohammad

doi:10.1680/macr.12.00088

Cited by 34 publications

(12 citation statements)

References 14 publications

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“…As we know, flowability is drawing more people's attention, especially with the wide use of high-performance concrete (HPC), which is of great significance not only to the difficulty level in cast progress but also to the mechanical property and durability after hardening. 26,27 The flowability was tested by fluidity and rheometer, and the results were shown in Figures 1 and 2.…”

Section: Flowability Of the Pastementioning

confidence: 99%

Effects of particle size of colloidal nanosilica on hydration of Portland cement at early age

Zhang

Yang

et al. 2019

Advances in Mechanical Engineering

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The aim of this study is to evaluate the effects of different particle sizes colloidal nanosilica (30, 60, and 140 nm) on the early performance of Portland cement. Flowability, mechanical property, and microstructural characterization tests were conducted to investigate the macroscopic and microscopic properties. The results revealed that the flowability of the paste decreased with the reduction of the particle size of colloidal nanosilica. The main reason was that the sol may form flocculation restricting a part of free water under ion environment, and this phenomenon became more serious as the particle size decreased. The compressive strength with 60-nm sol was higher than that of the other two, and hydration activities under different situations were further proved by hydration heat analysis. The reasons causing this result were mainly because flocculation limited the original chemical activity like pozzolanic and seeding effects of nanomaterials. Through thermogravimetric analysis and X-ray diffraction, it can be concluded that the seeding and pozzolanic effects of nanomaterials dominated the hydration process at different periods. Comparing images from scanning electron microscopy, the microstructure was most compact when incorporated into 60-nm sol, and filling effects also contributed to the performance during hardening.

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Section: Flowability Of the Pastementioning

confidence: 99%

Effects of particle size of colloidal nanosilica on hydration of Portland cement at early age

Zhang

Yang

et al. 2019

Advances in Mechanical Engineering

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“…It can be seen from Equation (1) that the relative suspension viscosity

and

are closely related. According to the literature [ 27 , 28 , 29 , 30 ], Krieger Dougherty equation is suitable for the fresh paste of fibre-reinforced concrete, and the properties of fresh paste of fibre-reinforced concrete can be divided into three stages according to the equation

value. In the first stage, due to the value of

being low, there are only a few fibres in the suspension, and these fibres are far away from each other, so the probability of overlapping and clustering is very low, which almost does not affect the workability and mechanical properties of fibre-reinforced concrete.…”

Section: Fibre Factor Theoretical Methodsmentioning

confidence: 99%

“…At this stage, the fresh slurry is considered to be a semi diluted system, and the probability of contact between fibres increases with the increase the value of

. In previous experiments [ 27 , 28 , 29 , 30 ], when there are enough fibres, the free water in the matrix for lubrication is less and less, and the fluidity of fresh paste of fibre-reinforced concrete is reduced. However, with the increase of the number of fibres, the bridging effect is more obvious, and the mechanical properties of hardened products are improved significantly.…”

Section: Fibre Factor Theoretical Methodsmentioning

confidence: 99%

“…For example, the slump of fibre-reinforced concrete declines with the growth of FF [ 24 , 25 ]. According to the theoretical model proposed by Krieger and Dougherty [ 26 ], the relationship between FF and the flowability of steel, polypropylene (PP) and glass fibre-reinforced cementitious composite was studied [ 27 , 28 , 29 , 30 ]. Cao et al [ 31 ] and Si et al [ 32 , 33 ] studied the influence of FF of the polyvinyl alcohol (PVA) fibre and steel-PVA hybrid fibre on the rheological and mechanical properties of mortar.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Polypropylene Fibre Factor on Flowability and Mechanical Properties of Self-Compacting Geopolymer

Liu

et al. 2021

Materials

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The possibility of using geopolymer instead of Portland cement could effectively reduce carbon dioxide emissions from cement manufacturing. Fibre-reinforced self-compacting geopolymers have great potential in civil engineering applications, such as chord member grouting for concrete-filled steel tubular truss beams. However, to the best of the authors’ knowledge, the quantitative relationship between FF and the properties of the fibre-reinforced geopolymer has been rarely reported. In this research, 26 groups of mixtures were used to study the influence of the polypropylene fibre factor (FF) on the flowability and mechanical properties and also the compactness of the fibre-reinforced self-compacting geopolymer. At the same volume fraction, geopolymers with long fibres present worse flowability than those having short fibres due to the easier contacting of long fibres. By growing the FF the influence of fibre addition on the V-funnel flow rate is more significant than the slump spread. This can be ascribed to the consequence of fibre addition and friction by the V-funnel which estimates the restrained deformability. For FF lesser than critical factor Fc = 100, influence of fibres is negligible and fibres are far apart from each other and, thus, they cannot restrict cracking under load and transfer the load to improve the mechanical properties. For FF between the Fc = 100 and density factor Fd = 350, a noteworthy enhancement of mechanical properties was obtained and the geopolymer was still adequately workable to flow by weight of self, without any symbols of instability and fibre clumping. Under this condition, better fibre dispersal and reinforcing productivity can lead to better hardened properties. For FF higher than Fd = 350, fibres tend to come to be entwined together and form clumping resulting from the fibre balling, resulting in worse hardened properties. This research offers a sensible basis for the application of the workability regulator of the fresh properties of fibre-reinforced geopolymer as an operative way to basically obtain ideal mechanical properties.

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“…Most studies have shown that adding polypropylene fibre can significantly improve the early age shrinkage and anti-cracking properties of SCC (He and Yang, 2009;Kwon et al, 2008;Liu and Ding, 2008), the fracture property (He and Shen, 2013;Luo and Li, 2010), the erosion resistance to sulfuric acid and sulfate (Bassuoni and Nehdi, 2007;Behfarnia and Farshadfar, 2013), and can also effectively reduce the risk of explosive spalling (Lee et al, 2012;Sideris and Manita, 2013;Uysal and Tanyildizi, 2012). The effects of aspect ratio (or length) and volume fraction of polypropylene monofilament fibre on mechanical properties of SCC (Lee et al, 2012;Mehdipour et al, 2013) have been investigated, and the effects of specimen size and shape of polypropylene monofilament fibre-reinforced SCC (Aslani, 2013) have also been investigated. Persson (2006) indicated that polypropylene monofilament fibre seemed to prevent the flow of void water, thus resulting in the internal collapse of SCC under frost cycles, whereas Ozbay et al (2011) showed that polypropylene monofilament fibre led to an increase of water porosity and chloride ion permeability in SCC and worsened its strength.…”

Section: Introductionmentioning

confidence: 99%

Combined impacts of polypropylene fibres on workability, strength and permeability of SCC

He¹,

Yan²,

Gu³

et al. 2014

Magazine of Concrete Research

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The workability, strength and permeability of self-consolidating concrete (SCC), reinforced with polypropylene monofilament fibre, collated fibrillated polypropylene network fibre and a hybrid of these two, are investigated.Combined impacts of polypropylene fibres on SCC are then analysed using the theory of Bingham plastic flow, the principle of fracture mechanics and the composition of microstructure based on scanning electron microscopy. Resultsshow that: (a) in the case of identical fibre volume fraction, the workability of fresh SCC reinforced with polypropylene monofilament fibre is better than that with fibrillated polypropylene network fibre; (b) when the fibre volume fraction is less than 0 . 10%, strength properties and water impermeability of hardened SCC increase with the fibre addition, and the charge passed increases slightly, but when the fibre volume fraction is higher than 0 . 15%, the charge increases dramatically; (c) SCC with polypropylene monofilament fibre has better impermeability, but lower static strength than that with fibrillated polypropylene network fibre; (d) compared with ordinary SCC, SCC with the hybrid of 0 . 05% volume fraction of polypropylene monofilament fibre and 0 . 05% collated fibrillated polypropylene network fibre has a 22% increase in flexural tensile strength, a 21% increase in splitting strength and a 56% decrease in water penetration depth, and the Coulomb value of chloride ion penetrability is low, about 1013 C at 56 d.

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Relationship between workability and mechanical properties of fibre-reinforced self-consolidating mortar

Cited by 34 publications

References 14 publications

Effects of particle size of colloidal nanosilica on hydration of Portland cement at early age

Effects of particle size of colloidal nanosilica on hydration of Portland cement at early age

Influence of Polypropylene Fibre Factor on Flowability and Mechanical Properties of Self-Compacting Geopolymer

Combined impacts of polypropylene fibres on workability, strength and permeability of SCC

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