Geopolymers and Their Uses: Review

Burduhos-Nergis, Dumitru Doru; Abdullah, Mohd Mustafa Al Bakri; Vizureanu, Petrică; Tahir, Muhammad Faheem Mohd

doi:10.1088/1757-899x/374/1/012019

Cited by 62 publications

(37 citation statements)

References 48 publications

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“…If low density geopolymers are requested, 100 fly ash geopolymers are ideal having a density of just 1.2 g/cm 3 , by replacing fly ash with aggregates in 70 % by mass density is increased to roughly 1.8 g/cm 3 .…”

Section: Microstructural Analysismentioning

confidence: 99%

“…Thus, in order to reduce the consumption of raw materials and economic resources, in recent years, the re-use of materials has been emphasized on a global scale [2]. A simple technique, known as geopolymerization [3], grows in interest in obtaining building materials with properties similar to those based on Portland cement, but using waste as raw material [4]. The final product obtained through geopolymerization is called geopolymer, which can be described as totally inorganic ceramic material based on aluminum and silicone compounds (table 1) [5].…”

mentioning

confidence: 99%

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Synthesis and Characteristics of Local Fly Ash Based Geopolymers Mixed with Natural Aggregates

Burduhos-Nergis¹,

Vizureanu²,

Corbu³

2019

Rev. Chim.

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Global industrialization generates large amount of waste which strongly affects the depositing areas and the living creatures from the surroundings. In the same time, the construction sector meets an exponential development process, resulting in materials and construction areas increase. Therefore, the need of new materials was felt worldwide. One solution that knew a rapid development, especially in this sector, was to obtain new eco-friendly materials through a mechanism called geopolymerization. True this powerful chemical reaction between a waste, rich in aluminum and silicon, and a strong alkaline solution, a tetragonal structure of Al-O-Si is obtained that possess properties comparable to those of Portland cement-based concrete. In the present paper the effect of aggregates on local fly ash based geopolymers is analyzed from the structure and mechanical properties point of view. According to this study, the aggregates strongly influence the density, compression strength and flexural strength at any age of samples.

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Section: Microstructural Analysismentioning

confidence: 99%

mentioning

confidence: 99%

Synthesis and Characteristics of Local Fly Ash Based Geopolymers Mixed with Natural Aggregates

Burduhos-Nergis¹,

Vizureanu²,

Corbu³

2019

Rev. Chim.

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“…The strength of geopolymers is a critical factor within the building and construction domain. The development of strength in geopolymers strongly depends on the raw materials and the alkali activator solutions [7][8][9][10][11][12][13][14][15][16]. Even though geopolymers with slow strength development generate materials with lower strength, this drawback can be addressed by increasing heat and aging time [17].…”

Section: Introductionmentioning

confidence: 99%

Strength Development and Elemental Distribution of Dolomite/Fly Ash Geopolymer Composite under Elevated Temperature

et al. 2020

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A geopolymer has been reckoned as a rising technology with huge potential for application across the globe. Dolomite refers to a material that can be used raw in producing geopolymers. Nevertheless, dolomite has slow strength development due to its low reactivity as a geopolymer. In this study, dolomite/fly ash (DFA) geopolymer composites were produced with dolomite, fly ash, sodium hydroxide, and liquid sodium silicate. A compression test was carried out on DFA geopolymers to determine the strength of the composite, while a synchrotron Micro-Xray Fluorescence (Micro-XRF) test was performed to assess the elemental distribution in the geopolymer composite. The temperature applied in this study generated promising properties of DFA geopolymers, especially in strength, which displayed increments up to 74.48 MPa as the optimum value. Heat seemed to enhance the strength development of DFA geopolymer composites. The elemental distribution analysis revealed exceptional outcomes for the composites, particularly exposure up to 400 °C, which signified the homogeneity of the DFA composites. Temperatures exceeding 400 °C accelerated the strength development, thus increasing the strength of the DFA composites. This appears to be unique because the strength of ordinary Portland Cement (OPC) and other geopolymers composed of other raw materials is typically either maintained or decreases due to increased heat.

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“…From the results obtained, kaolin fulfilled the requirement as a precursor of raw material for the manufacturing of the geopolymer. This is due to the fact that materials in forming of geopolymer should be rich in Si and Al as important sources of Si 4+ and Al 3+ in binding system that will be activated by alkali activator solution [56][57][58]. The XRD patterns in Figure 1 present the phase analysis for raw kaolin material.…”

Section: Characterization Of Raw Materialsmentioning

confidence: 99%

Effect of Aluminium Powder on Kaolin-Based Geopolymer Characteristic and Removal of Cu2+

et al. 2021

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This current work focuses on the synthesis of geopolymer-based adsorbent which uses kaolin as a source material, mixed with alkali solution consisting of 10M NaOH and Na2SiO3 as well as aluminium powder as a foaming agent. The experimental range for the aluminium powder was between 0.6, 0.8, 1.0 and 1.2wt%. The structure, properties and characterization of the geopolymer were examined using X-Ray Diffraction (XRD), Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). Adsorption capacity and porosity were analysed based on various percentages of aluminium powder added. The results indicate that the use of aluminium powder exhibited a better pore size distribution and higher porosity, suggesting a better heavy metal removal. The maximum adsorption capacity of Cu2+ approached approximately 98%. The findings indicate that 0.8% aluminium powder was the optimal aluminium powder content for geopolymer adsorbent. The removal efficiency was affected by pH, adsorbent dosage and contact time. The optimum removal capacity of Cu2+ was obtained at pH 6 with 1.5 g geopolymer adsorbent and 4 h contact time. Therefore, it can be concluded that the increase in porosity increases the adsorption of Cu2+.

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Geopolymers and Their Uses: Review

Cited by 62 publications

References 48 publications

Synthesis and Characteristics of Local Fly Ash Based Geopolymers Mixed with Natural Aggregates

Synthesis and Characteristics of Local Fly Ash Based Geopolymers Mixed with Natural Aggregates

Strength Development and Elemental Distribution of Dolomite/Fly Ash Geopolymer Composite under Elevated Temperature

Effect of Aluminium Powder on Kaolin-Based Geopolymer Characteristic and Removal of Cu2+

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