XRD and TG-DTA Study of New Alkali Activated Materials Based on Fly Ash with Sand and Glass Powder

Burduhos-Nergis, Dumitru Doru; Abdullah, Mohd Mustafa Al Bakri; Sandu, Andrei Victor; Vizureanu, Petrică

doi:10.3390/ma13020343

Cited by 80 publications

(18 citation statements)

References 58 publications

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“…Due to the fact that mainly any material rich in aluminum and silicon, which can be dissolved by an alkaline solution, can be used for geopolymers, a number of wastes have been identified globally with potential for geopolymerization, such as: furnace ash [13,14], red mud [15], blast furnace slag [16] etc. After the chemical reaction between the solid component, the waste, and the alkaline activator, a solution of sodium silicate and sodium hydroxide, a totally inorganic material with a similar structure to the zeolite is obtained.…”

Section: Geopolymers Structurementioning

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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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: Geopolymers Structurementioning

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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“…The authors in [53] describe that water in inorganic materials such as alkali-activated materials (geopolymers) is present in several forms. It is hygroscopic (so-called free) water which is removed up to a temperature of 120 • C. Another type is strong physically bound water which is removed in the temperature range 120-300 • C. This water can be divided into several subgroups: crystallization water, hydrogel water and zeolitic water.…”

Section: Thermal Analysismentioning

confidence: 99%

Possibilities of Application Cement By-Pass Dust into the Garden Architecture Elements

2021

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This article deals with the possibility of using cement by-pass dust (CBPD) in the garden architecture elements, specifically in curbs for park use. To increase the positive effect on the environment, other secondary raw materials were also used in the research, specifically blast furnace granulated slag and silica fly ash. Mixtures were based on alkali activation, where cement as a binder was 100% replaced by raw materials with waste properties. In the research, properties of used materials and also the basic physical-mechanical and durability properties of prepared mixtures were determined Part of the research focused on the effect of the tested beams on the grassland planted around the beams. Any significant negative impact was not registered, except for low pH increase of soil. Infrared spectroscopy and thermal analysis were performed on selected samples. Testing has shown that the products are in accordance with the Czech standard requirements for concrete curbs in garden architecture. The samples did not pass only the scaling test, which is, however, a condition for concrete curbs used for roads. For garden architecture this test is not required.

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XRD and TG-DTA Study of New Alkali Activated Materials Based on Fly Ash with Sand and Glass Powder

Cited by 80 publications

References 58 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

Possibilities of Application Cement By-Pass Dust into the Garden Architecture Elements

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