Characterization of class C and F fly ashes based geopolymers incorporating silica fume

Yavuz, Emre; GÜL, Nazlı İpek KUL; Koçkal, Niyazi Uğur

doi:10.1016/j.ceramint.2022.07.163

Cited by 31 publications

(5 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The chemical properties of fly ash are the basis for identifying the main group of fly ash. The American Society for Testing and Materials (ASTM) and the American Association of State Highway Traffic Officials (AASHTO) have divided fly ash into two classes: C and F. Numerous studies have worked to understand the chemical properties of both classes of fly ash (Adjei & Elkatatny, 2020;Mathapati et al, 2021;Yavuz et al, 2022). Class C of fly ash often comes from coals that have the potential to generally produce ash with greater lime concentration, more than 10-15%, which could demonstrate self-hardening tendencies since there is more CaO present.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Strength Characteristic of Soil Stabilized With Fly Ash

Farichah,

Hutama,

Solin

2023

jpensil

View full text Add to dashboard Cite

High domestic consumption of coal, especially in energy sector, has raised concerns on several environmental issues in Indonesia. Large amount of coal combustion product in the form of solid waste, such as fly ash resulting from coal power plant production causes problems in its disposal since its necessity of land occupancy. Over the last decade, many researchers have put effort to solve this disposal concerns by utilizing these materials for various purposes, such as construction materials as part of circular economy. This paper presents the utilization of fly ash for soil stabilization in Surabaya. Firstly, the index properties of soil samples were determined through a series of laboratory soil test including specific gravity, unit weight, moisture content, sieve analysis and Atterberg’s limit tests. Subsequently, standard proctor test was conducted to obtain the maximum dry density and optimum moisture content of the soil samples. Using those parameters, four types of soil stabilized with fly ash samples were prepared with fly ash content based on weight of soil as follows: 0%, 5%, 10%, and 15%. Finally, unconfined compression tests were performed with cylindrical soil samples to assess the unconfined compressive strength of those samples. The results indicate that soil with fly ash content of 10% showing the highest unconfined compressive strength compared to the other variations of 0.90 kg/cm2.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of the Strength Characteristic of Soil Stabilized With Fly Ash

Farichah,

Hutama,

Solin

2023

jpensil

View full text Add to dashboard Cite

show abstract

“…In addition, geopolymeric material has a very important environmental advantage, which is the possible use of waste from other industries for its development [21]. This is feasible as long as the waste is a potential source of aluminosilicates, such as coal fly ash [22], slag from metallurgical processes [23], metakaolin [24], glass waste [25], bagasse [26] and even hazardous [27]. In turn, these aluminosilicates must be alkaline activated, using, in most investigations, sodium hydroxide [28] or potassium hydroxide [29] solutions in the appropriate proportions.…”

Section: Introductionmentioning

confidence: 99%

Factor Analysis of the Physical–Mechanical Properties for Geopolymers Based on Brick Dust and Biomass Bottom Ash as Eco-Friendly Building Materials

Terrones-Saeta,

Luís,

Romero

et al. 2023

Processes

View full text Add to dashboard Cite

The production of building materials is unavoidable if the well-being and development of society are to be maintained. However, in manufacturing these materials, significant greenhouse gas emissions and environmental effects are produced. For this reason, and with the aim of reducing the impact of the manufacture of these materials, this work developed a geopolymeric material made up solely of wastes, brick dust and biomass bottom ashes which replaced the traditional ceramic materials. To evaluate the quality of this sustainable geopolymeric material, different groups of specimens were formed with different percentages of both residues, subsequently determining the physical properties of the new-formed geopolymers and guaranteeing they accomplish the prescriptions of the ceramic regulations for construction. In addition, the results of the geopolymer characterisation tests were statistically analysed using factor analysis, with the sole purpose of establishing connections and interdependence between the variables that influence the geopolymerisation process. Thus, it was possible to demonstrate that the combination of brick dust and biomass bottom ashes produced geopolymers with adequate qualities to replace traditional ceramics, as well as that the different combinations of both residues produced feasible materials to be used as ceramics with various characteristics, with two main factors determined by factorial analysis that governed the physical properties of the geopolymer obtained: the percentage of brick dust and the theoretical porosity.

show abstract

“…This is because most of the SCMs are industrial solid wastes with pozzolanic activity, which can be used directly without undergoing high-temperature calcination. Most industrial solid wastes can be used only by simple grinding, such as granulated blast furnace slag [4][5][6], steel slag [7], copper slag [8], phosphorus slag [9,10], sewage sludge ash [11], etc. Compared with cement, the energy consumption in the production process is greatly reduced.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Properties of Coal Gasification Fly Ash and Pulverized Coal Fly Ash as Supplementary Cementitious Materials

Luo,

Jin

2023

Sustainability

View full text Add to dashboard Cite

Using industrial waste as part of the raw material to produce cement-based materials is considered to be a sustainable cement and concrete materials production method. Coal gasification fly ash (hereafter CGFA) is a solid waste produced during the coal gasification process. Similar to pulverized coal fly ash (hereafter PCFA), it is also a kind of fly ash discharged from combustion coal furnaces. With the development of coal gasification technology, more and more CGFA needs to be treated. Based on the successful experience of PCFA as a supplementary cementitious material in cement-based materials, CGFA is used as a supplementary cementitious material in this paper. A comparison of the performance of two coal-based fly ashes as a supplementary cementitious material (hereafter SCM) was conducted. The effects of two fly ashes on the fluidity and strength of cement mortar were discussed, and the mechanism was analyzed from the mineral composition and morphology of hydration products. At the same time, the properties of CGFA and ultrafine CGFA (UFCGFA) as an SCM were compared. The results show that CGFA has more negative effects on the fluidity of cement mortar than PCFA. But it has a greater contribution to the strength of cement mortar than PCFA. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results show that the active components of CGFA participate in the hydration reaction faster, showing a stronger pozzolanic reactivity than PCFA. Ultrafine treatment of CGFA not only improves the pozzolanic activity but also reduces the negative effect on the fluidity of cement mortar. The contribution of UFCGFA to the fluidity and strength of cement mortar can be greatly improved.

show abstract

Characterization of class C and F fly ashes based geopolymers incorporating silica fume

Cited by 31 publications

References 81 publications

Evaluation of the Strength Characteristic of Soil Stabilized With Fly Ash

Evaluation of the Strength Characteristic of Soil Stabilized With Fly Ash

Factor Analysis of the Physical–Mechanical Properties for Geopolymers Based on Brick Dust and Biomass Bottom Ash as Eco-Friendly Building Materials

Comparison of the Properties of Coal Gasification Fly Ash and Pulverized Coal Fly Ash as Supplementary Cementitious Materials

Contact Info

Product

Resources

About