Utilization of Fly Ash, Red Mud, and Electric Arc Furnace Dust Slag for Geopolymer

Harmaji, Andrie; Sunendar, Bambang

doi:10.4028/www.scientific.net/msf.841.157

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…Mechanical properties of geopolymer are influenced by the curing time: the longer the curing time the harder the material with a standard curing of 28 days [15]. Vickers microhardness experiment was conducted at 7, 14, and 28 days to analyse the effect of curing time to hardness of geopolymer.…”

Section: Methodsmentioning

confidence: 99%

The Effect of Tapioca on Morphological and Mechanical Properties of Metakaolin–Zirconia Geopolymer for Dental Restorative Nanocomposite

2022

Nanosistemi, Nanomateriali, Nanotehnologii

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Composite is one of the direct dental restoration materials, which is consisted of three main components such as matrix, filler, and coupling agent. Metakaolin and zirconia are potential alternatives as dental restoration materials. This study aims to determine the characteristics of synthesized metakaolin-zirconia geopolymer nanocomposite with the addition of tapioca as a template. The study is a pure experimental laboratory investigation. The sample is fabricated by means of both the synthesis of metakaolin, zirconia, alkali activator, chitosan and the addition of tapioca of 0.4% v/v, 0.8% v/v, and 1.6% v/v. Alkali solution consisting of NaOH and Na 2 SiO 3 is used to activate the geopolymerization of metakaolin. Nanocomposite characteristics with variations of the addition of tapioca template are then evaluated for its hardness and microstructure. Synthesis of metakaolin-zirconia geopolymer nanocomposite with the addition of tapioca template is successful, and it has a mean hardness value, which has met the hardness value used for dental composite restoration and has the best attachment to artificial teeth. The best hardness value is of 51.70 VHN achieved by the addition of 1.6% v/v tapioca to geopolymer. The resulting SEM images of all samples show a mean particle size of 100 nm indicating that the size is suitable for dental restoration with the value of 5-100 nm.Композит є одним з безпосередніх зубних реставраційних матеріялів,

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Section: Methodsmentioning

confidence: 99%

The Effect of Tapioca on Morphological and Mechanical Properties of Metakaolin–Zirconia Geopolymer for Dental Restorative Nanocomposite

2022

Nanosistemi, Nanomateriali, Nanotehnologii

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“…The oxide composition of fly ash is shown in Table 2. Geopolymer is made by mixing Fly Ash and Silica sand which is then mixed with an alkaline activator solution with a ratio of Water Glass and NaOH 2:1 (Harmaji, A., et al, 2016). Mixing was commenced using Hobart TM Mixer to form a slurry then casted with a size of 50 mm x 50 mm x 50 mm , then removed after one day as Figure 3.…”

Section: Gp-sw Fly Ash Waterglass+seawatermentioning

confidence: 99%

Seawater as Alkali Activator in Fly Ash Based Geopolymer

Harmaji

2022

EMACS Journal

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Indonesia as a maritime country in the world with 66% of its territory consists of maritime territory. A lot of potential that can be exploited, such as sea water. XRD characterization results indicate that the sea water from Tanjung Priok, North Jakarta, Indonesia has a compound Halite (NaCl) and Bassanite (CaSO4.5H2O) in the salt form. These compounds are alkaline thereby can influence the compressive strength of the geopolymer. Geopolymer is made up of aluminosilicate precursors which are activated by the alkaline activator solution, which usually combines sodium silicate and sodium hydroxide. The precursor material is waste from the coal based power plant called fly ash that produce 219.000 tonne per year and still underutilized but potentially as an alternative to cement. In this study, seawater was used to substitute the sodium hydroxide in alkali activator as an effort to reduce the manufacturing cost of Geopolymer. Geopolymer prepared by mixing fly ash as a precursor, silica sand as aggregates, with activator, then casted and cured by immersion. After 28 days compression test was conducted to measure the strength of resulting geopolymer. The sample consisted of a mixture of fly ash, silica sand, waterglass, and seawater produces strength of 16.60 MPa. X-Ray Diffraction characterization was conducted to study the compound formed from precursors activated with seawater alkali activator. Resulting diffractogram indicate the formation of anorthite compound as proof of Geopolymerization has been successfully occured.

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“…On the other hand,The world has a large output of fly ash. Although it has been applied in the fields such as building materials, its second utilization rate is still at a low level [3,4]. It is generally understood that combining cement with fly ash or other supplemental cementing ingredients enhances both the geological and technical qualities of the concrete mix.…”

Section: ‫الخرسانة‬ ‫سطح‬ ‫وامتصاص‬ ‫قوة‬ ‫على‬ ‫املتطاير‬ ‫والرماد‬ ...mentioning

confidence: 99%

Effect of binary blended of Portland cement and fly ash to the Strength and Surface Absorption of Concrete

Darwesh¹,

Elbasir²,

Miskeen³

2022

JOPAS

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The main objective of this paper is to determine the effect of fly ash on the workability, compressive strength , and initial surface absorption test of cement concrete using Portland cement and fly ash as partial replacements for Portland cement at 0%, 5%, 10%, 15% , 20% and 25% for a water-cement ratios(0.38) , the cement concretes have higher initial surface absorption values than Portland cement and fly ash concrete at 28 days and the disparity reduced due to improved pozzolanic reactivity of the supplementary cements with increasing curing age. However, Portland cement and fly ash concrete performed better than Portland cement concrete due to their higher fineness, improved particle packing and higher pozzolanic reactivity. The results showed that the compressive strength of 25% fly ash replacement resulted in concrete with a 28-day maximum strength of 48.25 MPa. and the result showed sample which contained Fly ash has less initial surface absorption and it’s also showed that the concrete containing 5%,10% and 15% of fly ash had less initial surface absorption than other cubes 20% and 25% fly ash.

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Utilization of Fly Ash, Red Mud, and Electric Arc Furnace Dust Slag for Geopolymer

Cited by 8 publications

References 5 publications

The Effect of Tapioca on Morphological and Mechanical Properties of Metakaolin–Zirconia Geopolymer for Dental Restorative Nanocomposite

The Effect of Tapioca on Morphological and Mechanical Properties of Metakaolin–Zirconia Geopolymer for Dental Restorative Nanocomposite

Seawater as Alkali Activator in Fly Ash Based Geopolymer

Effect of binary blended of Portland cement and fly ash to the Strength and Surface Absorption of Concrete

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