Characteristics of a Fly Ash-Based Geopolymer Cured in Microwave Oven

Minh, Quang Tran; Ngo, P; Nguyen, Hoc Thang

doi:10.4028/www.scientific.net/kem.850.63

Cited by 8 publications

(10 citation statements)

References 14 publications

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“…As the pressure increases further, the sample density hardly increases anymore 11 . After forming, the samples had cured under two different conditions: 1.…”

Section: Formingmentioning

confidence: 98%

“…The physico-mechanical properties of the specimens were determined after 28 days of curing. This is the time that the specimen weight has been not changed, the properties were considered stable 11 . Volumetric density was determined by equation d = m/V (therein m is the weight of the sample and V is its volume, calculated by V = πd 2 h/4.…”

Section: Determination Of the Propertiesmentioning

confidence: 99%

“…When dehydrated, the WG condenses to form a gel-like polymer circuit with the features of poly (sialate) M n -(-Si -O -Al -O -) n and poly (sialate -siloxo)M n -(-Si -O -Al -O -Si -O -) n [7][8][9] . For increasing the rate of condensation, the unbaked materials can be applied to the treatments in the atmosphere by drying at 65 -110 o C 8,10 or using microwave energy 11 . When using WS to fabricate unburned materials by the geopolymer method, due to the weak alkaline activity of the WS, the substances with better alkaline activity such as FA, silica fume often need to be mixed 1 .…”

Section: Introductionmentioning

confidence: 99%

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Unbaked materials from mixtures of waste sludge of a water purification plant, fly ash, and water glass

Minh

Nhi

2021

Sci. Tech. Dev. J.- Eng. Tech.

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In water purification plants, a large area of urban land is using to store waste sludge (WS). The waste sludge from water filtration plants is aluminosilicate, which can be form a geopolymer. However, the waste sludge has low alkaline activity, so it must be used in combination with fly ash (FA) to create geopolymer products. Fly ash is a solid waste containing amorphous silica so that has high alkaline activity, suitable for treatment by geopolymer method. The geopolymerization of waste sludge from water purification plants is a relatively new method. The geopolymer is a binder formed by the chemical reaction between aluminosilicate materials and alkaline activated solutions. The alkaline activated solution used in these experiments was water glass (WG). The water glass is solution of sodium silicate (Na2O.nSiO2) dissolved in water. The research results of geopolymer materials from the mixture of fly ash, the waste sludge of Thu Duc water purification plant, Ho Chi Minh City (Vietnam), and water glass (WG) were introduced in this study. The activated Al2O3 and SiO2 oxides in the fly ash and the waste sludge can be dissolved in the water glass and polymerized into a geopolymer material. The test samples had pressed at a high pressure of 225 MPa to form cylindrical ones weighing approximately 3 grams, height about 18 mm, and 10 mm in diameter. These samples were then cured at 110 ◦C for 24 hours and at room temperature (30 +/- 5 ◦C). The methods of Fourier infrared spectroscopy (FTIR) and scanning electron microscope (SEM) had used to detect the microscopic structure and geopolymer bond formation of the samples. The compressive strength of the tested samples at 28 days old was higher than 3.5 MPa, the pH was less than 12.5, meeting the Vietnamese National Standards for unbaked materials (TCVN 6477:2016) and National Technical Regulation on environmental impact (QCVN 50:2013 / BTNMT), respectively. The results show a new approach of solidifying the waste sludge for further applications such as the manufacture of geopolymer concretes or landfill materials.

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“…As the pressure increases further, the sample density hardly increases anymore 11 . After forming, the samples had cured under two different conditions: 1.…”

Section: Formingmentioning

confidence: 98%

Section: Determination Of the Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unbaked materials from mixtures of waste sludge of a water purification plant, fly ash, and water glass

Minh

Nhi

2021

Sci. Tech. Dev. J.- Eng. Tech.

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“…Normally, the alkaline activators increase the pH value when they are dissolved into solutions. And at high pH (>12), aluminosilicates (SiO2 and Al2O3) are easily dissolved and reacted to form tetra-aluminate ([Al(OH)4] -) and tetra-silicate (Si(OH)4 or H4SiO4-acid silicic) [1,5,11,19,20].…”

Section: Effects Of Alkaline Activators To Geopolymerization Reactionsmentioning

confidence: 99%

Geopolymerization: A Review on Physico-chemical Factors Influence to the Reaction Process

Thang

2020

JoPC

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A geopolymer is one of materials belonging to an inorganic polymer group based on aluminosilicate structural networks. The material is a product of reactions among the activated alumino-silicate resources and solutions of alkaline activators in various conditions. There have been many investigations conducted to produce geopolymer using different raw materials and methods. The chemical factors have a decisive role in the reaction process and the formation of the geopolymeric structural networks. The physical factors significantly influenceon engineering properties, microstructural characteristicsas well as the effectiveness of the reactions. This study is a review on evaluation of relationships among physico-chemical factors in the reaction process. In which, the chemical factors were considered both the alumino-silicate raw materials and alkaline activators. The physical factors were evaluated on the various conditions known as mixing time, curing time and curing temperature.

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“…The products based on WTR have very low strength (Waijarean et al, 2013;Geraldo et al, 2017) due to the weak alkaline activity of WTR. Therefore, WTR treatment should be combined with materials of high activity, such as FA (Suksiripattanapong et al, 2015Horpibulsuk et al, 2016Janani and Santhi, 2018;Susanto et al, 2020), metakaolin (Geraldo et al, 2017), rice husk ash (Waijarean et al, 2014;Poowancum et al, 2015), and others (Nguyen, 2020a;Nguyen, 2020b;Do et al, 2020a;Do et al, 2020b;Nguyen, 2021, Petrus et al, 2021.…”

Section: Introductionmentioning

confidence: 99%

Influence of Curing Regimes on Engineering and Microstructural Properties of Geopolymer-Based Materials from Water Treatment Residue and Fly Ash

Nguyen¹,

Thach²,

Minh³

2021

IJTech

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Geopolymerization is a new method for treating water treatment residue (WTR) from water purification plants to reduce the amount of stored land in urban areas. Polymeric bond formation depends on the curing conditions. In this study, the curing conditions suitable for subsequent treatment to save energy consumption and production costs in the future application were investigated. The WTR had a high aluminosilicate content with low alkaline activity, so fly ash (FA) was added to FA and WTR mixtures in the ratio of 40 and 60 weight percent (% in wt.), respectively. The moisture content of the mixtures ranged in 12-15%, suitable for semi-dry pressing to form pellets. After this formation, the geopolymer samples were cured under different conditions (room temperature, microwave oven, in dryer at 110°C, and in autoclave with hydrothermal condition). The experimental results showed that the hydrothermal samples had better properties, such as pH<9, high stability of mechanical strength over 3.5 MPa, and soft coefficient over 0.75. The microstructural properties were investigated using modern analytical tools, such as XRD, SEM, FTIR, and NMR, to detect the chemical functional groups of the aluminosilicate networks in the geopolymer matrix and the close relationship among the properties and its microstructure.

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Characteristics of a Fly Ash-Based Geopolymer Cured in Microwave Oven

Cited by 8 publications

References 14 publications

Unbaked materials from mixtures of waste sludge of a water purification plant, fly ash, and water glass

Unbaked materials from mixtures of waste sludge of a water purification plant, fly ash, and water glass

Geopolymerization: A Review on Physico-chemical Factors Influence to the Reaction Process

Influence of Curing Regimes on Engineering and Microstructural Properties of Geopolymer-Based Materials from Water Treatment Residue and Fly Ash

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