Aged Fly Ash Activity
Characterization of naturally aged cement-solidified …
generated by human activities. About 0.5 kg samples at a depth of 15–20 cm from each grid sampling of 4 m * 4m was mixed together and kept in a self-closing plastic bag. Wooden shovel was used to collect the fly ash samples to avoid the heavy metal contamination from the metal tools. Analysis of core samples of cement-solidified FA obtained ...
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Preparation and characterization of low-activity coal bottom ash …
However, fly ash was always as the main raw material and the utilization rate of coal bottom ash was low in the above-mentioned researches. It is mainly due to the low pozzolanic properties of coal bottom ash compared with fly ash, granulated blast-furnace slag powder, steel slag and other high-silicon-aluminum solid wastes [[14], [15], [16]].
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Leaching Characteristics of Arsenic from Aged Alkaline Coal Fly Ash …
Leaching of arsenic from ash in coal fly ash disposal facilities is a cause for concern due to possible contamination of groundwater. Sequential batch and column leaching experiments were carried out to determine the leaching of arsenic from ash found at a retired ash impoundment basin near a coal-fired power plant. This study assessed the leaching characteristics of …
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Comparison of Strength Activity of Limestone-Calcined Clay …
The Chinese fly ash has the finest particle size and would be expected to have better pozzolanic strength activity as compared to the Indian fly ash. The BET surface area measurement yields values of 2.328 m 2 /g for Chinese fly ash, 0.696 m 2 /g for the Indian fly ash and 8.353 m 2 /g for the LC2.
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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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Fly Ash and Granulated Blast Furnace Slag to Mitigate the
Mostly, the preventive activity of supplementary cementitious materials is simultaneous with its pozzolanic activity, considering that a large number of these materials are pozzolans, Footnote 1 such as fly ash, silica fume, metakaolin, ground brick and rice husk ash. Although granulated blast furnace slag has shown positive properties in the ASR mitigation, it …
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Leaching kinetics and reactivity evaluation of fly ash based …
The recent development of sustainable green cement technology has brought hope on fly ash for production alkali-activated cementitious materials (AACs), due to the high content of SiO 2 and Al 2 O 3 (the sum of SiO 2, Al 2 O 3, and Fe 2 O 3 is approximately 70 %). The practicability of using fly ash to produce AACs has been proven [[24], [25], [26]].Fly ash has …
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Characterization of naturally aged cement-solidified MSWI fly ash
Analysis of core samples of cement-solidified FA obtained at a depth of 1–12 m showed that the leached amounts of certain core components (including high concentrations of soluble salts) did not change obviously with depth and carbonation did not occur (A. et al., 2011, Kosson et al., 2014b).The surface layer of solidified FA is eroded by the natural environment, …
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Fresh and hardened properties of alkali-activated fly ash/slag …
Low calcium content in fly ash promotes the formation of C-(N)A-S-H gel with high Al substitution and improves the compressive strength at later age. It seemed that the grinding …
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Fly Ash properties, characterization, and applications: a …
Fly ash (FA) is the principal industrial waste byproduct from the burning of solid fuels. FA is a powdery solid that is constituted mostly of unburned carbon (UC), metal oxides (Si, Fe, Ca, and Al ...
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Comprehensive Utilization of Fly Ash | SpringerLink
The activity of fly ash depends on the reaction capacity of cinerite in fly ash, i.e., ... In tailings cemented backfilling process, adding certain amount of fly ash or filling cementing material dominated by fly ash could …
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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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Coal fly ash amendment in acidic field: Effect on soil …
Soil microbial activity, quality and onion yield were studied with FA in acidic soil. • FA at 50 Mg/ha improved density of PSB, AMF, actinomycetes and microbial activity.. Optimal soil nutrients and less heavy metal content were at 50 Mg/ha FA.. At 50 Mg/ha FA onion yield was 24% more than control.. Soil microbes were highly correlated with soil quality and onion yield …
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Characterization of naturally aged cement-solidified MSWI fly ash
Request PDF | On Jan 12, 2021, Jiantao Li published Characterization of naturally aged cement-solidified MSWI fly ash | Find, read and cite all the research you need on ResearchGate
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Mechanical properties and microstructure evolution of alkali …
Mechanical properties and microstructure evolution of alkali-activated GGBS-fly ash-steel slag ternary cements ... 11.81 % and 18.08 % higher than that of G10, respectively, with G4F2S4 exhibiting the highest fluidity. SS with low activity and low ... Structural transition to well-ordered phases of NaOH-activated slag-metakaolin cements aged by ...
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Nature of fly ash amendments differently influences …
DOI: 10.1016/j.ecoenv.2016.12.027 Corpus ID: 31307171; 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.
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Fly ash properties, characterization, and applications: A review
Fly ash (FA) is the principal industrial waste byproduct from the burning of solid fuels. FA is a powdery solid that is constituted mostly of unburned carbon (UC), metal oxides (Si, Fe, Ca, and Al), and other inorganic substances. ... and mass moisture content and higher content of fine-grained minerals enhanced the biological activity in the ...
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Carbonation behavior of aged alkali-activated fly …
Fly ash M M M Q M M Q Q Q Q Q Q MeFig. 1 XRD patterns of raw slag and y ash. The annotations indicate:anhydrite, Me melilite, Q quartz, M mullite Table 2 Design of the …
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Review A review on fly ash high-value synthesis utilization …
Significantly, fly ash contains a substantial amount of alumina, with high-aluminum fly ash containing more than 38%, and in some cases exceeding 50% (Ding et al., 2017; …
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(PDF) Pozzolanic Activity of Fly Ash
2011, Bangladesh Journal of Scientific and Industrial Research. Various physico-chemical properties such as particle size distribution, specific gravity, specific surface area, chemical composition, solubility of Fly Ash (FA) in NaOH and pozzolanic activity of fly ash towards lime have been investigated.
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Table 2 . Physical Properties and Activity Index of Fly Ash
Download Table | Physical Properties and Activity Index of Fly Ash from publication: The effect of the partial cement substitution with fly ash on Delayed Ettringite Formation in heat-cured ...
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Approaches to enhance the carbonation resistance of fly ash …
The layered structure of hydrotalcite is partially destroyed by calcination at 500 °C, and the CO 3 2-which is hydrogen-bonded between the bimetallic layers is converted into CO 2 and released into the air (Duan et al., 2018). Ke et al. (2017) also confirmed the excellent ability of C-HT to fix CO 3 2-in alkali-activated slag cement. Shui et al. (2018) reported that the …
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Bond characteristics between early aged fly ash concrete and
Amrutha et al. [3] conducted an experimental study to investigate the influences of different temperatures on the residual strength of the concrete with high volume of fly ash. …
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Comparative assessment of P adsorption, release kinetics, …
Safe disposal of huge quantity of fly ash is compulsory to avoid environmental problems, and contents of significant amount of plant nutrients, particularly phosphorus (P), make it a potential amendment in agriculture. A comparative assessment of P adsorption, release kinetics and enzymatic activities of weathered fly ash amended texturally different soils is yet …
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(PDF) Comparison of Strength Activity of …
The index of ash activity was calculated on samples aged 28 days, data on the compressive strength of heavy concrete samples prepared with the replacement of a part of the cement with the studied ...
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Pozzolanic Activity of Fly Ash
Various physico-chemical properties such as particle size distribution, specific gravity, specific surface area, chemical composition, solubility of Fly Ash (FA) in NaOH and pozzolanic activity of fly ash towards lime have been investigated. Chemical analysis of FAreveals that the FA used in this present investigation belongs to class F type of fly ash. …
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Fly ash composting to improve fertiliser value – A review
microbial activity in fly ash, which limits its mineralisation. Even when applied to the soil, fly ash has been reported ... aged alkaline fly ash from two power . stations on pH, salinity ...
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Estimation of compressive strength of waste concrete utilizing fly ash …
The reason for this is the Pozzolanic activity of both fly ash and GGBFS. Pozzolanic materials have the ability to react with calcium hydroxide, which is produced during cement hydration, when ...
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The sorption of pentachlorophenol by aged sediment …
For aged sediments containing 2% BCs, the sorption capacity was 9.15- and 2.87-fold higher than that of FC when supplemented with RC aged at 25 and 45°C, respectively. Therefore, biochar is better than fly ash for controlling organic pollutants even when the RC was present in …
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Frontiers | Experimental Study on Preparation and …
Introduction. Fly ash is a by-product of coal combustion in power stations, which presents as tiny grains with a certain pozzolanic activity. As one of the industrial solid wastes, fly ash has attracted much more attention on its …
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