Characterization of Fly Ash on Geopolymer Paste

doi:10.4028/WWW.SCIENTIFIC.NET/MSF.841.118

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Characterization of Fly Ash on Geopolymer Paste

Journal Article•DOI•

Characterization of Fly Ash on Geopolymer Paste

Ratni Nurwidayati¹, Muhammad Bahrul Ulum¹, Januarti Jaya Ekaputri¹, Triwulan¹, Priyo Suprobo¹ - Show less +1 more•Institutions (1)

Sepuluh Nopember Institute of Technology¹

01 Jan 2016-Materials Science Forum (Trans Tech Publications)-Vol. 841, pp 118-125

TL;DR: In this article, the effect of loss of ignition, specific gravity, fineness, specific surface area and soluble fly ash to compressive strength of geopolymer paste was studied.

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Abstract: The effect of loss of ignition, specific gravity, fineness, specific surface area and soluble fly ash to compressive strength of geopolymer paste were studied. Six fly ashes from two different sources and different time of collection were evaluated. Sodium hydroxide and sodium silicate were used as alkali activator. Concentration of sodium hydroxide and mass ratio of sodium hydroxide to sodium silicate were fixed 14M and one respectively. The result indicated that the improvement in compressive strength of geopolymer paste was more influenced by fineness, specific surface area and soluble content of fly ash. Soluble content of fly ash greatly affected the compressive strength of geopolymer paste compare to the compressive strength of cement paste with 20% fly ash replacement.

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Journal Article•DOI•

Effects of fly ash characteristics and alkaline activator components on compressive strength of fly ash-based geopolymer mortar

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Muhammad N. S Hadi¹, Mustafa Sameer Abdulkareem Al-azzawi¹, Tao Yu¹•Institutions (1)

University of Wollongong¹

30 Jun 2018-Construction and Building Materials

TL;DR: In this article, the compressive strength of fly ash-based geopolymer mortar (FBGM) made from five different sources of fly ashes was examined and the results indicated that the optimum AL/FA ratio for activating fly ash was in the range of 0.5 and 0.6.

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97 citations

Cites methods from "Characterization of Fly Ash on Geop..."

...The use of different synthesis 101 conditions complicated the analysis of the controlling factors in the selection of the mix 102 proportion [3, 24-29]....
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Journal Article•DOI•

Effect of Curing Temperature and Fiber on Metakaolin-based Geopolymer

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Januarti Jaya Ekaputri¹, Subaer Junaedi², Wijaya•Institutions (2)

Sepuluh Nopember Institute of Technology¹, State University of Makassar²

01 Jan 2017-Procedia Engineering

TL;DR: In this article, the authors present the mechanical properties of geopolymer mortar with metakaolin as a base material and apply steam curing at 60 o C-80 o C to increase the tensile strength.

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36 citations

Journal Article•DOI•

Chemical and Physical Characterization of Fly Ash as Geopolymer Material

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Puput Risdanareni¹, Puput Risdanareni², Poppy Puspitasari¹, Poppy Puspitasari², Ekaputri Januarti Jaya² - Show less +1 more•Institutions (2)

State University of Malang¹, Sepuluh Nopember Institute of Technology²

01 Jan 2017

TL;DR: In this article, the chemical and physical properties characterized by XRF, pH value, XRD and SEM of fly ash are investigated and the results showed that fly ash is a waste material rich in silica and alumina becomes popular raw material to produce geopolymer.

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Abstract: Research on finding suitable cement substitute material becomes massive due to environmental effect. Geopolymer as inorganic material is potential to be the smart solution to overcome global warming issue. Fly ash is a waste material rich in silica and alumina becomes popular raw material to produce geopolymer. The best properties ofgeopolymer paste come from the high quality of fly ash. Therefore, it is important to investigate various types of fly ash and geopolymer properties. Their chemical and physical properties characterized by XRF, pH value, XRD and SEM. The results showed that type of fly ash depended on amount of Si-based of Ca-based compound which consisted of spherical morphology. Geopolymer paste produced from the ash with different compound has bulky and irregular shape morphology. The pH value of each ash has also a correlation with the setting time of fresh paste.

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28 citations

Journal Article•DOI•

Factors influencing strength and setting time of fly ash based-geopolymer paste

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Adhitya Leonard Wijaya¹, Januarti Jaya Ekaputri¹•Institutions (1)

Sepuluh Nopember Institute of Technology¹

01 Jan 2017

TL;DR: In this paper, seven samples of fly ash were collected from five Indonesian power plants to assess their physical and chemical properties, and all fly ashes were activated with alkali activator to prepare geopolymer paste.

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Abstract: In general, fly ash is often used as a binder in geopolymer mixture. In this paper, seven samples of fly ash were collected from five Indonesian power plants. The variation of fly ash may depend upon many factors. However, there is no standardization of fly ash used for geopolymer binder. This experiment was conducted to study and categorize fly ashes both by assessing their physical and chemical characters. All fly ashes were activated with alkali activator to prepare geopolymer paste. Ratio of fly ash to the alkali activator was kept constant at 65 : 35. Compression test was conducted at three, seven, 14, 21, 28, and 56 days to identify the strength development of each sample. The result revealed that the content of CaO in fly ash affected the setting time and early strength development. In three days paste with CaO content more than 20% gain 54% of its 28-day strength. It is caused by both hydration and polymerization reactions. A range of Si to Al ratio contributed to the strength.

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27 citations

Journal Article•DOI•

Fly ash as a raw material for geopolymerisation - chemical composition and physical properties

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Kinga Korniejenko, Nóra Papné Halyag¹, Gábor Mucsi¹•Institutions (1)

University of Miskolc¹

01 Nov 2019

23 citations

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Journal Article•DOI•

NaOH-activated ground fly ash geopolymer cured at ambient temperature

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Kiatsuda Somna¹, Chai Jaturapitakkul¹, Puangrat Kajitvichyanukul¹, Puangrat Kajitvichyanukul², Prinya Chindaprasirt³ - Show less +1 more•Institutions (3)

King Mongkut's University of Technology Thonburi¹, Naresuan University², Khon Kaen University³

01 Jun 2011-Fuel

TL;DR: In this paper, ground fly ash (GFA), with a median particle size of 10.5μm, was used as source material for making geopolymers cured at room temperature, and compressive strength tests and microstructure observations using SEM, EDX, XRD and FTIR were performed.

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755 citations

"Characterization of Fly Ash on Geop..." refers background or methods in this paper

...[6] evaluated effect the fineness of fly ash particle to compressive strength of paste geopolymer on different NaOH concentration....
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...[6] evaluated effect of class C fly ash which retained on 45μm sieve less than 2% to compressive strength of paste geopolymer on different NaOH concentration....
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...[6] used only NaOH as alkali activator while in this research NaOH and Na2SiO3 were used as alkali aktivator....
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...The reactivity increases as the particle size of fly ash decreases [6, 13]....
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Journal Article•DOI•

Characterisation of fly ashes. Potential reactivity as alkaline cements

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Ana Fernández-Jiménez¹, Ángel Palomo¹•Institutions (1)

Spanish National Research Council¹

01 Dec 2003-Fuel

TL;DR: In this article, a representative group of Spanish fly ashes has been characterised in order to determine its capacity for being alkali activated and give place to a material with cementitious properties.

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610 citations

"Characterization of Fly Ash on Geop..." refers background or methods in this paper

...Fernández and Palomo [5] recommended Fe2O3 content less than 10% to achieve maximum strength....
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...All fly ashes have Fe2O3 more than 10% whereas Jiménez & Palomo [5] suggested Fe2O3 less than 10% and low content of CaO to obtain maximum strength....
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...All fly ashes have LOI less than 6% as recommended by ASTM C618 [10] while Jiménez & Palomo [5] proposed less than 5%....
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...The higher specific surface of this material requires the higher ratio of liquid/solid and lower the pozzolanic reaction [2, 5, 11]....
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...Jiménez & Palomo [5] examined chemical, physical, mineralogical and microstructure of Spanyol fly ash to determine the reactivity of fly ash....
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Journal Article•DOI•

Effect of fly ash fineness on compressive strength and pore size of blended cement paste

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Prinya Chindaprasirt¹, Chai Jaturapitakkul², Theerawat Sinsiri²•Institutions (2)

Khon Kaen University¹, King Mongkut's University of Technology Thonburi²

01 Apr 2005-Cement & Concrete Composites

TL;DR: In this paper, the effect of fly ash fineness on compressive strength, porosity, and pore size distribution of hardened cement pastes was investigated and it was shown that the blended cement paste with classified fly ash produced paste with higher compressive power than that with original fly ash.

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Abstract: This paper presents an experimental investigation on the effect of fly ash fineness on compressive strength, porosity, and pore size distribution of hardened cement pastes. Class F fly ash with two fineness, an original fly ash and a classified fly ash, with median particle size of 19.1 and 6.4 μm respectively were used to partially replace portland cement at 0%, 20%, and 40% by weight. The water to binder ratio (w/b) of 0.35 was used for all the blended cement paste mixes. Test results indicated that the blended cement paste with classified fly ash produced paste with higher compressive strength than that with original fly ash. The porosity and pore size of blended cement paste was significantly affected by the replacement of fly ash and its fineness. The replacement of portland cement by original fly ash increased the porosity but decreased the average pore size of the paste. The measured gel porosity (5.7–10 nm) increased with an increase in the fly ash content. The incorporation of classified fly ash decreased the porosity and average pore size of the paste as compared to that with ordinary fly ash. The total porosity and capillary pores decreased while the gel pore increased as a result of the addition of finer fly ash at all replacement levels.

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534 citations

"Characterization of Fly Ash on Geop..." refers background or result in this paper

...Similar result occurs on cement paste which partially replaced with fly ash [13]....
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...It occurred because fly ash more reactive on smaller particle compare on bigger particle of fly ash [13]....
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...The reactivity increases as the particle size of fly ash decreases [6, 13]....
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Journal Article•DOI•

Factors affecting the suitability of fly ash as source material for geopolymers

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E.I. Diaz¹, Erez N. Allouche¹, Sven Eklund¹•Institutions (1)

Louisiana Tech University¹

01 May 2010-Fuel

TL;DR: In this paper, the suitability of fly ash stock piles for geopolymer manufacturing was studied and the results of chemical analyses, X-ray diffraction (XRD) and particle size distribution (PSD) of five sources of coal-fired power generating plants in the US are presented.

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410 citations

"Characterization of Fly Ash on Geop..." refers background in this paper

...The physical, chemical and mechanical properties of geopolymer are strongly influenced by the properties of raw material such as fly ash [1, 2]....
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...Low percentage of particle fly ash retained on 45μm sieve shows higher specific surface area and higher reactivity of fly ash and subsequently increases the compressive strength of paste [2, 12]....
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...However the properties of fly ash vary depends on the quality of coal, temperature and process of combustion [1, 2, 3, 4]....
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...The higher specific surface of this material requires the higher ratio of liquid/solid and lower the pozzolanic reaction [2, 5, 11]....
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...[2] suggested that CaO content just between 5 to 15% which could be used as geopolymer material....
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Journal Article•DOI•

Engineering Properties of Alkali-Activated Fly Ash Concrete

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Ana Fernández-Jiménez, Ángel Palomo, Cecilio Lopez-Hombrados

01 Mar 2006-Aci Materials Journal

TL;DR: In this article, results from experimental research carried out on certain engineering properties of a new (portland cement-free) concrete made with alkali-activated fly ash are reported.

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Abstract: In this paper, results are reported from experimental research carried out on certain engineering properties of a new (portland cement-free) concrete made with alkali-activated fly ash Lab tests were conducted to determine its bending and compression mechanical strength, modulus of elasticity, bond strength, and shrinkage The results show that mortar and concrete made with portland cement-free activated fly ash develop a high mechanical strength in short periods of time, have a moderate modulus of elasticity, bond better to reinforcing steel, and shrink much less than ordinary portland cement concrete

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403 citations

"Characterization of Fly Ash on Geop..." refers background in this paper

...The present sodium silikat in aktivator increases the compressive strength because the reaction in geopolymer occurs faster than using only sodium hidroksida [14, 15]....
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