Study on Partial Replacement of Silica Fume Based Geopolymer Concrete Beam Behavior under Torsion

Daniel, A. Joshua; Sivakamasundari, S.; Nishanth, A.

doi:10.1016/j.proeng.2016.12.162

Cited by 21 publications

(11 citation statements)

References 11 publications

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“…Hence, the hybrid reinforcement of steel fibres and conventional reinforcements in AAC beams increases the torsional strength of the beams. The findings of the beneficiation of steel fibres addition in concrete under torsional load are consistent with the literature [ 20 , 21 , 27 ].…”

Section: Resultssupporting

confidence: 92%

“…Several recent research works have been conducted on pure and fibre reinforced AAC performance under torsional forces [ 24 , 25 , 26 , 27 ]. To the author’s knowledge, there is also no study conducted on the post crack performance of purely fibre reinforced beams in torsional load to compare with conventional and hybrid reinforcements of both fibres and steel reinforcements.…”

Section: Introductionmentioning

confidence: 99%

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Torsional Behaviour of Steel Fibre Reinforced Alkali Activated Concrete

Lau

Htut²,

Melling³

et al. 2020

Materials

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Nine alkali-activated concrete beams were produced and tested under pure torsional load to failure. The alkali-activated concrete beams were produced with following variables: (i) fibres only, (ii) conventionally reinforced or (iii) a hybrid of both fibres and conventional steel reinforcement. The fibres only beams were found to have approximately 20% higher cracking torque than conventionally reinforced beams. However, fibres only beams were observed to have lower post crack ductility and inconsistent post crack behaviour, in comparison to conventionally reinforced alkali-activated concrete (AAC) beams. On the other hand, the hybrid reinforcements in AAC beams were found to demonstrate more ductile post crack behaviour consistently of the beams tested. Hybrid reinforcement was also shown to have 20% and 25% improvement in cracking and ultimate torque compared to conventionally reinforced, which suggests that it is suitable for industrial applications to improve structure capacity. The ultimate torque results of the beams were compared to an analytical model that considered the contribution of fibres. It was found that the ultimate torque of the hybrid reinforced beam has good correlation with the model but overestimated conventionally reinforced beams.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Torsional Behaviour of Steel Fibre Reinforced Alkali Activated Concrete

Lau

Htut²,

Melling³

et al. 2020

Materials

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“…When the standard deviation of three specimens is taken into consideration, the samples Geo-rGO-TiO 2 (0.5, 3) and Geo-rGO-TiO 2 (1, 3) had the maximum strength. The magnitude of the splitting tensile strength of the geopolymer produced in this study is slightly lower than that of a silica fume-based geopolymer reported by Daniel et al [57]. One of the most significant qualities of the pervaporation membrane is mechanical strength, which allows it to endure the high pressure of hot liquid that is constantly striking its surface.…”

Section: The Surface Area and Porosity Of Geo-rgo-tio 2 Nanocomposites (Pervaporation Membranes)contrasting

confidence: 59%

Pervaporation Membranes for Seawater Desalination Based on Geo–rGO–TiO2 Nanocomposites. Part 1: Microstructure Properties

et al. 2021

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This is the first of two papers about the synthesis and microstructure properties of the Geo–rGO–TiO2 ternary nanocomposite, which was designed to suit the criteria of a pervaporation membrane for seawater desalination. The performance and capability of Geo–rGO–TiO2 as a seawater desalination pervaporation membrane are described in the second paper. A geopolymer made from alkali-activated metakaolin was utilized as a binder for the rGO-TiO2 nanocomposite. A modified Hummer’s method was used to synthesize graphene oxide (GO), and a hydrothermal procedure on GO produced reduced graphene oxide (rGO). The adopted approach yielded high-quality GO and rGO, based on Raman spectra results. The nanolayered structure of GO and rGO is revealed by Transmission Electron Microscopy (TEM) images. The Geo–rGO–TiO2 ternary nanocomposite was created by dispersing rGO nanosheets and TiO2 nanoparticles into geopolymer paste and stirring it for several minutes. The mixture was then cured in a sealed mold at 70 °C for one hour. After being demolded, the materials were kept for 28 days before being characterized. Fourier Transform Infrared (FTIR) and X-ray Diffraction (XRD) measurements revealed that the geopolymer matrix efficiently bonded the rGO and TiO2, creating nanocomposites. Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS) was used to examine the morphology of the outer layer and cross-sections of nanocomposites, and the results displayed that rGO were stacked on the surface as well as in the bulk of the geopolymer and will potentially function as nanochannels with a width of around 0.36 nm, while TiO2 NPs covered the majority of the geopolymer matrix, assisting in anti-biofouling of the membranes. The pores structure of the Geo–rGO–TiO2 were classified as micro–meso pores using the Brunauer–Emmet–Teller (BET) method, indicating that they are appropriate for use as pervaporation membranes. The mechanical strength of the membranes was found to be adequate to withstand high water pressure during the pervaporation process. The addition of rGO and TiO2 NPs was found to improve the hyropobicity of the Geo–rGO–TiO2 nanocomposite, preventing excessive seawater penetration into the membrane during the pervaporation process. The results of this study elucidate that the Geo–rGO–TiO2 nanocomposite has a lot of potential for application as a pervaporation membrane for seawater desalination because all of the initial components are widely available and inexpensive.

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“…Industrial waste ashes : FA [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ], coal bottom ash [ 28 ], industrials slags [ 3 , 20 , 29 , 30 , 31 , 32 , 33 , 34 ], silica fume [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ], artificial pozzolans (calcined clays [ 34 , 43 , 44 , 45 ], ceramic residues [ 46 , 47 ], sedimentary rocks containing clay minerals and burned bauxites [ 48 , 49 , 50 ]), natural pozzolans (volcanic tuffs/zeolites [ 51 , 52 ], siliceous such as opal and diatomaceous earth [ 53 , 54 , 55 , 56 , 57 ], and volcanic glasses such as volcanic ashes [ 58 , 59 , 60 , 61 ,…”

Section: Introductionmentioning

confidence: 99%

Incorporation of Alkali-Activated Municipal Solid Waste Incinerator Bottom Ash in Mortar and Concrete: A Critical Review

Kurda

2020

Materials

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In the light of one of the most common waste management issues in urban areas, namely the elimination of municipal solid waste (MSW; about 486 kg of the waste per capita were generated in the EU in 2017), this study discusses one technique as an outlet in the construction industry for the by-product of the waste’s incineration in energy recovery facilities (i.e., MSW incinerator bottom ash—MIBA). There have been some investigations on the use of MIBA as partial replacement of cement to be used in cementitious composites, such as concrete and mortars. However, the waste’s incorporation ratio is limited since further products of hydration may not be produced after a given replacement level and can lead to an unsustainable decline in performance. In order to maximize the incorporation of MIBA, some research studies have been conducted on the alkali activation of the waste as precursor. Thus, this study presents an extensive literature review of the most relevant investigations on the matter to understand the material’s applicability in construction. It analyses the performance of the alkali-activated MIBA as paste, mortar, and concrete from different perspectives. This literature review was made using search engines of several databases. In each database, the same search options were repeated using combinations of various representative keywords. Furthermore, several boundaries were made to find the most relevant studies for further inspection. The main findings of this review have shown that the chemical composition and reactivity of MIBA vary considerably, which may compromise performance comparison, standardization and commercialization. There are several factors that affect the performance of the material that need to be considered, e.g., type and content of precursor, alkaline activator, curing temperature and time, liquid to solid ratio, among others. MIBA-based alkali-activated materials (AAM) can be produced with a very wide range of compressive strength (0.3–160 MPa). The main factor affecting the performance of this precursor is the existence of metallic aluminum (Al), which leads to damaging expansive reactions and an increase in porosity due to hydrogen gas generation stemming from the reaction with the alkaline activator. Several approaches have been proposed to eliminate this issue. The most effective solution was found to be the removal of Al by means of eddy current electromagnetic separation.

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Study on Partial Replacement of Silica Fume Based Geopolymer Concrete Beam Behavior under Torsion

Cited by 21 publications

References 11 publications

Torsional Behaviour of Steel Fibre Reinforced Alkali Activated Concrete

Torsional Behaviour of Steel Fibre Reinforced Alkali Activated Concrete

Pervaporation Membranes for Seawater Desalination Based on Geo–rGO–TiO2 Nanocomposites. Part 1: Microstructure Properties

Incorporation of Alkali-Activated Municipal Solid Waste Incinerator Bottom Ash in Mortar and Concrete: A Critical Review

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