Mechanical properties of micro and sub-micron wollastonite fibers in cementitious composites

Dey, Vikram; Kachala, Robert; Bonakdar, A.; Mobasher, Barzin

doi:10.1016/j.conbuildmat.2015.02.084

Cited by 59 publications

(38 citation statements)

References 15 publications

(19 reference statements)

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“…The slope was inversely proportional to the crack mouth opening displacement. The larger the CMOD, smaller the slope [7,8,10,11]. This fact indicates that there is a degradation of stiffness, which is related to energy dissipation during the loading and unloading process [8].…”

Section: Resultsmentioning

confidence: 99%

“…(2) The critical crack length is the crack length at which the crack becomes unstable [10]. This parameter is obtained by the Eq.…”

Section: Testing Methodsmentioning

confidence: 99%

“…From this procedure, it is possible to measure some fracture parameters that are sufficient to characterize the fracture resistance and energy dissipation of the composite [7,9]. Moreover, previous researches have shown that the compliance variation at each cycle performed represents the dissipation of energy with the development of crack the during loading [8,10,11].…”

Section: Introductionmentioning

confidence: 99%

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Cyclic Flexural Behavior of Polypropylene and Sisal Fiber Reinforced Concrete

Castoldi¹,

Souza²,

Silva³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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This experimental research investigation aims to compare the cyclic behavior of concrete reinforced with discrete polypropylene and sisal fibers. Prismatic concrete specimens having dimensions of 550 x 150 x 150 mm were produced with concrete containing low alkaline content. Both fibers used were 51 mm long and were incorporated into fractions of 6 kg/m 3 and 10 kg/m 3 of polypropylene and sisal fiber, respectively. A cyclic three-point flexural test was conducted in notched beams based on recommendations of RILEM TC 89-FMT. All the composites presented deflection softening behavior and both fibers provided the same level of residual loads. The loading and unloading cycles resulted in degradation of stiffness with increasing CMOD, being more evident for concretes reinforced with polypropylene fiber. Some fracture parameters obtained from the cyclic tests showed that both composites presented similar fracture properties. 1.

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Section: Resultsmentioning

confidence: 99%

“…(2) The critical crack length is the crack length at which the crack becomes unstable [10]. This parameter is obtained by the Eq.…”

Section: Testing Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cyclic Flexural Behavior of Polypropylene and Sisal Fiber Reinforced Concrete

Castoldi¹,

Souza²,

Silva³

2018

Proceedings of the 4th Brazilian Conference on Composite Materials

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“…The fracture behavior of brittle matrices has shown significant improvements when rigid inclusions are incorporated [27,28]. The issue of poor fracture response of quasibrittle cementitious composites has been addressed incorporating steel fibers [29,30], glass fibers [31,32], carbon fibers [33,34], wollastonite [35,36], and textile reinforcement [37,38] in the cementitious matrix. Use of metallic waste particle-incorporation in heavy concrete has also been experimentally evaluated [39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Fracture response of metallic particulate-reinforced cementitious composites: Insights from experiments and multiscale numerical simulations

Nayak¹,

Krishnan²,

Das³

2019

Cement and Concrete Composites

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This paper presents an experimental and numerical investigation into the fracture response of mortars containing up to 30% waste iron powder by volume as OPC-replacement. The iron powdermodified mortars demonstrate significantly improved strength and fracture properties as compared to the control mortars due to presence of elongated iron particulates in the powder. With a view to develop a predictive tool towards materials design of such particulate-reinforced systems, fracture responses of iron powder-modified mortars are simulated using a multiscale numerical approach. The approach implements multi-scale numerical homogenization involving cohesive zone-based damage at the matrix-inclusion interface and isotropic damage in the matrix to obtain composite constitutive response and fracture energy. Consequently, these results serve as input to macro-scale XFEM-based three-point-bend simulations of notched mortar beams. The simulated macroscopic fracture behavior exhibit excellent match with the experimental results. Thus, the numerical approach links the material microstructure to macroscopic fracture parameters facilitating microstructure-guided material design.

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“…One of wollastonite's most unusual characteristics is its high aspect ratio needle-like structure, which increases its effectiveness as a reinforcing fibre (Low and Beaudoin 1993, 1994a, 1994bKalla et al 2013;Dey et al 2015;Pourakbar and Huat 2017). Besides, in the current global marketplace, the price of wollastonite ranges from US$0.2 to 0.3/kg, depending on its size (Soliman and Nehdi 2011), which is significantly lower than the price of steel fibres -US$6.6/kg (Ding et al 2011), carbon fibres -US$11.0/kg, or glass fibres -US $2/kg (Clark 1998).…”

Section: Introductionmentioning

confidence: 99%

Soil reinforcement through addition and subsequent carbonation of wollasonite microfibres

Pourakbar¹,

Fasihnikoutalab

Ball

et al. 2017

Geosynthetics International

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This study describes the application of wollasonite microfibres for stabilising soil with the additional function of sequestering CO 2. The high aspect ratio, needle-like structure of wollasonite imparted a microfibre mechanical reinforcement whilst the associated high surface area promoted carbonation. The originality of this paper lies in two unique aspects: the first stage assessed the efficacy of incorporating wollastonite microfibres inside the soil mass, while the second stage addressed the mechanical performance of the fibre-reinforced soil after different CO 2 pressures and carbonation times. In these two stages, the unconfined compressive strength (UCS), indirect tensile strength (ITS) and flexural strength (FS) were determined. The test results indicated that the inclusion of the fibres increased the peak and post-peak response during unconfined compressive strength (UCS) tests, while also improving the ITS and FS. The UCS peak stress was further improved when the fibre-reinforced soil was subjected to the carbonation process. This work impacts the soil stabilisation industry through a novel soil strengthening process that also promises an effective route to combat climate change through sequestration of CO 2 .

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Mechanical properties of micro and sub-micron wollastonite fibers in cementitious composites

Cited by 59 publications

References 15 publications

Cyclic Flexural Behavior of Polypropylene and Sisal Fiber Reinforced Concrete

Cyclic Flexural Behavior of Polypropylene and Sisal Fiber Reinforced Concrete

Fracture response of metallic particulate-reinforced cementitious composites: Insights from experiments and multiscale numerical simulations

Soil reinforcement through addition and subsequent carbonation of wollasonite microfibres

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