Fly ash to solid base catalyst: Synthesis, characterization and
They also exhibit biological activities including antimitotic, antimalarial, anticancer and anti-inflammatory activity [13]. Fly ash, an abundant, aluminosilicate, by-product of ... up to pH 8 in the above mixture. The resultant slurry was aged for 24 h, then filtered and washed with double distilled water up to pH 7 to remove leached compounds ...
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Carbonation induced phase evolution in alkali-activated slag/fly ash
In this study, the effects of silicate modulus of activators (Ms) on carbonation of alkali-activated slag/fly ash cements are studied and compared between natural (0.03–0.04% CO 2) and accelerated (1% CO 2) carbonation conditions, via XRD, FTIR and TG/DTG techniques.Carbonation results in the decalcification of the C-A-S-H gels and the formation of …
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Protocol for measuring indoor exposure to coal fly ash …
fly ash than the USA.17 Throughout the world, countries vary in the amount of fly ash that is beneficially used in products such as concrete and grout. In the USA, approx-imately 55% to 65% of fly ash is reused,16 17 however countries like China and India, where coal combustion is increasing, use less than 50% of fly ash.17 The fly ash that
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Protocol for measuring indoor exposure to coal …
Introduction Fly ash is a waste product generated from burning coal for electricity. It is comprised of spherical particles ranging in size from 0.1 µm to over 100 µm in diameter that contain trace levels of heavy metals. Large countries such as …
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Pozzolonic activity and strength activity index of bagasse ash and fly
Assessment of Pozzolonic activity of certain industrial waste is important due to an increasing need of cementitious material.This study was undertaken to widen the scope of using pozzolanic waste like fly ash and bagasse ash as a supplement to cement. Sugarcane bagasse ash (BA) is a solid waste obtained from the cogeneration combustion boilers in sugar industry …
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(PDF) Biochar & fly ash amendments lower mortality and …
The investigation presented a novel finding regarding mitigating stress induced by chlorpyrifos in Eisenia fetida by incorporating biochar derived from rice straw and fly ash as soil amendments.
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The effect of temperature on dissolution activity of fly ash …
The Si dissolution activation energy of ground fly ash is about 78 kJ/mol, while the dissolution activation energy of ordinary fly ash is about 50–59 kJ/mol. This indicates that grinding greatly affects the solubility activity of fly ash Si than Al. This may due to the exposure of the amorphous phase inside the fly ash.
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Carbonation behavior of aged alkali-activated fly ash/slag …
This study focused on characterizing the carbonation behavior of 90-day aged alkali-activated fly ash/slag blended by MgO. Effects of MgO reactivity on the carbonation …
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Characterization of naturally aged cement-solidified …
Characterization of naturally aged cement-solidified MSWI fly ash Bing Du, Jiantao Li, Wen Fang, Yili Liu, Shuyao Yu, Yu Li, Jianguo Liu⇑ Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China article info Article history: Received 17 June 2018 Revised 30 August 2018
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Characteristics and impact of aged coal ash with slag …
A mixture of coal bottom ash and slag, with a fraction of fly ash (CAFAS) from steam locomotives, was placed in the cave Divaška jama to delimit and level tourist trails. Emplacement began in ...
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The beneficial reuse of contaminated sediment: Long-term …
This research investigates the effects of ageing and maturation of solidified/stabilized mixtures of contaminated sediment with fly ash and lime.
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The sorption of pentachlorophenol by aged sediment …
Highlights We studied the effects of aging on the sorptivity of rice straw biochar and fly ash. Increasing the aging periods and temperature reduced their sorptivity. Rice straw biochar's sorptivity was greater than fly ash's, regardless aged or not. Rice straw biochar is a good functional material for controlling organic pollutants.
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Characterization of naturally aged cement-solidified MSWI fly ash
Affiliations 1 Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China.; 2 Key Laboratory for Solid Waste Management and Environment Safety, School of Environment, Tsinghua University, Beijing, PR China. Electronic address: [email protected].
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Impacts of pH on leaching potential of elements from MSW incineration
Concentrations of Cu in aged fly ash samples are 50–100 times higher than concentrations of fresh fly ash samples at pH ... Calculated log activities of the elements of interest obtained from MINTEQA2 and their corresponding leachate pH were graphed. These graphs were used to determine elements of interest that were controlled by mineral ...
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Carbonation behavior of aged alkali-activated fly ash/slag …
abstract = "This study focused on characterizing the carbonation behavior of 90-day aged alkali-activated fly ash/slag blended by MgO. Effects of MgO reactivity on the carbonation behavior of the synthesized binders were explored. A 0.3% CO2 concentration was adopted for an accelerated carbonation environment. The samples were characterized ...
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Adsorption efficiency and photocatalytic activity of fly ash …
Fly ash-based geopolymer mortar (GFM) was used as an adsorbent material to methylene blue () and also the dye removal material using the photocatalytic mechanism. The GFM, containing 50 wt% river sand aggregate, was prepared to have approximately 46% open porosity, pore size distribution between 0.01 and 3.5 mm, and water permeability of ...
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Linear electronic relationship of surface functionalized fly ash …
The fundamental mechanistic approach is the charge involvement of the mullite phase for the bactericidal activity of fly ash, which is explored with the help of phenol and substituted phenols. 51 The charge augmentation occurs at the interacting site of bacteria in the organic molecule by appropriate functional group substitution. The ...
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Toughness study of polyacrylamide-modified slag/fly ash …
The particle size distribution of fly ash determined by laser diffraction was shown in Fig. 1 (b), and the XRD pattern of the fly ash was presented in Fig. 2 (b). Fly ash consists of crystalline and amorphous phases, with the main crystalline phases being mullite, quartz, and hematite. The SEM image of the fly ash is shown in Fig. 3 (b). It ...
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Table 2 . Physical Properties and Activity Index of …
Delayed Ettringite Formation (DEF) is seen as a form of internal sulfate attack of cementitious materials, caused by early age heating to a temperature higher than 70°C. In this paper, the...
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Durability and sustainable assessment of fly ash-blended …
Conversely, the sole addition of MEA primarily influenced the pore structure in the specimen aged 90 days by enlarging the larger pore segment (greater than 100 nm). ... The role of pozzolanic activity of Siliceous fly ash in the formation of the structure of sustainable cementitious composites. Sustainable Chemistry, 3 (4) (2022), pp. 520-534.
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The study on the activity of fly ash in Ca(OH) 2 solution
Activate the potential activity is the main purpose of the study about the pozzolanic properties of fly ash.In order to eliminate the affection of Ca 2+,NaOH,NaCl,Na 2 SO 4 were used as activator ...
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Carbonation behavior of aged alkali-activated fly ash/slag …
This study focused on characterizing the carbonation behavior of 90-day aged alkali-activated fly ash/slag blended by MgO. Effects of MgO reactivity on the carbonation behavior of the synthesized binders were explored. A 0.3% CO2 concentration was adopted for an accelerated carbonation environment. The samples were characterized using compressive …
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Bond characteristics between early aged fly ash concrete …
In this paper a comprehensive experimental investigation on the residual bond strength between the early aged fly ash concrete and steel ribbed bar after exposed to high temperature has …
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(PDF) Interpreting the Strength Activity Index of Fly Ash …
Despite the tremendous attractions of using fly ash as an SCM, the addition of unqualified fly ashes 52 can be detrimental to concre te performance, causing diminis hed strength, delayed setting ...
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Reactivity of coal fly ash used in cementitious binder …
Over the last five decades or so, coal fly ashes have been used as supplementary cementitious materials (SCMs) in light of their pozzolanic, morphological, and micro-aggregate effects, which can be leveraged to produce concrete with desirable properties and outstanding performances [1].The principal benefits of fly ash (FA) as SCMs in the concrete industry are …
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Comparing Fly Ash Samples from Different Types of …
This study aims to investigate the physical and chemical characterization of six fly ash samples obtained from different municipal solid waste incinerators (MSWIs), namely grate …
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Properties of saline soil stabilized with fly ash and modified …
When fly ash content in the cured soil F1 is 0 %, its strength is mainly provided by the alkaline activation of aeolian sand to generate gel substances. After one freeze-thaw cycle, the unconfined compressive strength of cured soil F1 decreases by 23.64 %, and after seven cycles, it declines by 80 %.
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Effects of fly ash on soil microbial activity
Fly ash and microbial activity 133 Fig. 3. 1.5 0% ~-~ 3% 12% 1.0 0.5 i I~ I i i 10 20 30 40 days The rates of carbon dioxide evolved at various treatments of fly ash on the sandy loam. increase was observed after 10 days of incubation for 3 % ash-amended sandy soils, whilst only a slight increase in carbon dioxide evolution was recorded for the ...
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Acidic processing of fly ash: chemical …
Fly ash can undergo aging in the atmosphere through interactions with sulfuric acid and water. These reactions could result in chemical and physical changes that could affect the cloud condensation or ice nucleation activity of fly ash …
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Nature of fly ash amendments differently influences …
Nature of fly ash amendments differently influences oxidative stress alleviation in four forest tree species and metal trace element phytostabilization in aged contaminated soil: A long-term field experiment ... 8-OHdG, glutathione contents, SOD and PO activities between non-amended and coal fly ash amended groups were performed using a two-way ...
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