Ductile behavior of polyethylene fibre reinforced geopolymer composite

Shaikh, Faiz Uddin Ahmed; Ronnie, Zammar

doi:10.1051/matecconf/20179701047

Cited by 17 publications

(12 citation statements)

References 6 publications

(8 reference statements)

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“…The main reason for the reduction in compressive strength of FRGC samples is primarily associated with the inclusion of synthetic fibers. It has been noticed that polyethylene fibers tend to reduce the shear strength of concrete mainly because of the formation of air voids around the fiber-matrix interface which have also been reported by other researchers [41,42]. However, a three-fold increase in flexural tensile strength and toughness of HSG material is possible using the proposed hybrid-fiber reinforcement due to an improvement in the slip-forming characteristics and increased cohesiveness of fiber reinforced geopolymer mixture.…”

Section: Effect Of Confining Pressure On Stress-strain Response Of Frgcsupporting

confidence: 51%

Mechanical properties of ambient cured high-strength plain and hybrid fiber reinforced geopolymer composites from triaxial compressive tests

Khan

Hao

et al. 2018

Construction and Building Materials

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Geopolymer binders have evolved as a promising alternative to ordinary Portland cement (OPC) in concrete over the last few decades. However, many aspects of their mechanical behaviour such as their performance under multiaxial stress conditions are still unknown, which are of primary importance for their structural application. In this paper, the triaxial compressive behaviour of newly developed ambient-cured high-strength geopolymer (HSG) mortar, and fiber reinforced geopolymer composites (FRGC) is studied. A series of Ø50×100 mm cylindrical samples were prepared using low-calcium fly ash and ground granulated blast furnace slag, while hybrid steel-polyethylene fiber reinforcement with fiber volume fraction of 2% was used to reinforce the brittle geopolymer matrix. Standard triaxial tests with fifteen different levels of confining pressures [(σ3); ranging between 0 and 100 MPa] were employed to comprehensively investigate the triaxial stress-strain characteristics of synthesized materials from low to high range of confining pressures. According to test results, the unreinforced HSG samples exhibited linear elastic stress-strain behaviour under uniaxial stress condition and showed catastrophic brittle failure. Instead, the samples tested under confinement showed pseudo-ductile behaviour. On the other hand, the inclusion of hybrid-fiber reinforcement has meaningfully helped to improve the ductility of HSG matrix. The peak axial stress and the corresponding axial strain was found to increase with the increase of confining pressure, although the influence of active lateral confinement was more pronounced on the triaxial strength of HSG samples. The two most commonly used failure criterions for OPC concrete, i.e., Power-law and Willam-Warnke failure criterion were used to develop the empirical relations to predict the peak axial stress as a function of confining pressure for the studied materials. The proposed relationships can be used for the calibration of existing concrete material models. The obtained test results were also compared with the existing triaxial compression test data on high strength cement based concretes and composites in the literature to highlight the differences between geopolymers and OPC concrete.

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Section: Effect Of Confining Pressure On Stress-strain Response Of Frgcsupporting

confidence: 51%

Mechanical properties of ambient cured high-strength plain and hybrid fiber reinforced geopolymer composites from triaxial compressive tests

Khan

Hao

et al. 2018

Construction and Building Materials

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“…In the first experiment, the highest value was obtained for the matrix material-about 80 MPa, for subsequent samples this value decreased with the increasing amount of the fibers. The value was above 70 MPa for the 0.5% PE fibers addition and only about 30 MPa for 2.0% fibers addition [22]. In the second experiment, the highest value was obtained also for the control sample, matrix material, of 56.7 MPa.…”

Section: Polyethylene (Pe)mentioning

confidence: 71%

“…In the second experiment, the highest value was obtained also for the control sample, matrix material, of 56.7 MPa. For composites with PE fibers, these values were lower and increasing with the fiber content: 0.5%-28.4 MPa, 0.75%-35.0 MPa, 1.0%-44 MPa and 1.5%-45 MPa [22]. The best results for the bending strength were achieved for about 0.75-1.0% of the addition of PE fibers [22,23].…”

Section: Polyethylene (Pe)mentioning

confidence: 93%

“…The PE fibers (length 12 mm and diameter 12 µm) were also tested as an addition for the geopolymer in amount: 0.0, 0.5, 1, 1.5 and 2.0% by weight [22] and with a content of 0.0%, 0.5%, 0.75%, 1.0%, 1.5% by weight [23]. The matrix components were mainly products from the Gladstone power plant in Queensland, Australia [22,23]-fly ash and slag. Samples were tested after 28 days.…”

Section: Polyethylene (Pe)mentioning

confidence: 99%

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Mechanical Properties of Short Polymer Fiber-Reinforced Geopolymer Composites

2020

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The article describes the state of the art in reinforced geopolymers, taking into consideration various types of polymer fiber reinforcements, such as polypropylene, polyethylene, or polylactic acid. The description is focused on the usage of polymer short fibers and the mechanical properties of the geopolymer composites. However, to show a wider research background, numerous references are discussed concerning the selected studies on reinforcing geopolymer composites with long fibers and fabrics. The research method applied in the article is the critical analysis of literature sources, including a comparison of new material with other materials used in similar applications. The results of the research are discussed in a comparative context and the properties of the composites are juxtaposed with the properties of the standard materials used in the construction industry. Potential applications in the construction industry are presented. Moreover, the contemporary research challenges for geopolymer materials reinforced with fibers are presented.

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“…The drawbacks of the addition of low modulus fibers, however, are that the elastic modulus of FRCC is usually lower than that of plain cementitious composite and the propagation of large cracks cannot be restrained effectively. Moreover, the addition of low modulus fibers even cannot prevent the formation and propagation of microcracks at high stress level (Ahmed and Ronnie, 2017; Altikrite and Hadi, 2017; Hua et al., 2005; Sivakumar and Santhanam, 2007).…”

Section: Introductionmentioning

confidence: 99%

A novel damage model based on micromechanics for hybrid fiber reinforced cementitious composites under uniaxial compression

Zhang

Zhu

et al. 2018

International Journal of Damage Mechanics

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A novel damage model based on micromechanics is proposed for hybrid fiber reinforced cementitious composites under uniaxial compression. In this model, a multilevel homogenization method is presented to predict the overall elastic properties of hybrid fiber reinforced cementitious composites. To account for the contribution of microcracks on its macrocompliance under compression, hybrid fiber reinforced cementitious composite is considered equivalent to the microcrack-weakened solid, whose overall compliance consists of the compliance of the matrix and the additional compliance by sliding, propagating and kinking cracks. The bridging effects of hybrid fibers on restraining crack growth are simplified based on the reality that the average sliding displacement of microcracks is much less than the length of reinforcing fibers. The evolutional domains of microcrack growth under loads where the microcracks are sliding, propagating and kinking are discussed in detail. In addition, the weakening effects of fibers upon compressive behavior are captured by introducing two functions, which consider the influences of fiber geometrical parameters, the microcrack density and the distance between two nearest microcracks with the same oriented angle. Simulation results by our evolutionary damage model render reasonable agreements with available experimental data of fiber reinforced cementitious composites and hybrid fiber reinforced cementitious composites with various fiber contents. The new micromechanical damage model would be beneficial to elucidating the strengthening and weakening mechanisms of hybrid fiber reinforcement.

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Ductile behavior of polyethylene fibre reinforced geopolymer composite

Cited by 17 publications

References 6 publications

Mechanical properties of ambient cured high-strength plain and hybrid fiber reinforced geopolymer composites from triaxial compressive tests

Mechanical properties of ambient cured high-strength plain and hybrid fiber reinforced geopolymer composites from triaxial compressive tests

Mechanical Properties of Short Polymer Fiber-Reinforced Geopolymer Composites

A novel damage model based on micromechanics for hybrid fiber reinforced cementitious composites under uniaxial compression

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