Non-gray chemical composition based radiative property model of fly ash particles

2020 ◽  
Author(s):  
Jiawei Wan ◽  
Junjun Guo ◽  
Pengfei Li ◽  
Zhaohui Liu
Keyword(s):  
Fly Ash ◽  
Chemical Composition ◽  
Radiative Property ◽  
Property Model

Influence of Different Mineral Precursors on the Properties of Fly Ash Based Alkali-Activated Mortars

2018 ◽  
Vol 761 ◽  
pp. 73-78 ◽  
Author(s):  
Matej Špak ◽  
Pavel Raschman
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Chemical Composition ◽  
Coal Combustion ◽  
Pure Aluminum ◽  
Partial Replacement ◽  
Black Coal ◽  
Fly Ashes ◽  
Final Composition ◽  
Alkali Activated

Alkali-activated materials based on fly ash are widely developed and also produced on the present. Some of fly ashes are not suitable for production of alkali-activated materials because of their inconvenient chemical composition. Alumina-silicates are the most important components that are needed to accomplish the successful reaction. The proper content of amorphous phase of alumina-silicates and its proportion as well should be provided for the final composition of alkali-activated materials. The influence of pure aluminum oxide powder as well as raw milled natural perlite on mechanical properties and durability of alkali-activated mortars was investigated. These minerals were used as partial replacement of fly ash coming from black coal combustion. In addition, the mortars were prepared by using different alkali activators.

Radiative property model for non-gray particle based on dependent scattering

2021 ◽  
Vol 394 ◽  
pp. 863-878
Author(s):  
Zhen Cao ◽  
Cai Liang ◽  
Lunbo Duan ◽  
Xiaoping Chen ◽  
Daoyin Liu ◽  
...  
Keyword(s):  
Radiative Property ◽  
Property Model

Modeling of Alteration Behavior on Blended Cementitious Materials

2011 ◽  
Author(s):  
Hitoshi Owada ◽  
Tomoko Ishii ◽  
Mayumi Takazawa ◽  
Hiroyasu Kato ◽  
Hiroyuki Sakamoto ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Chemical Composition ◽  
Mineral Composition ◽  
Blast Furnace Slag ◽  
Fine Powder ◽  
Cementitious Materials ◽  
Leaching Tests ◽  
Measured Concentration ◽  
Furnace Slag

A “realistic alteration model” is needed for various cementitious materials. Hypothetical settings of mineral composition calculated based on the chemical composition of cement, such as Atkins’s model, have been used to estimate the alteration of cementitious material. However, model estimates for the concentration of certain elements such as Al and S in leachate have been different from experimental values. In a previous study, we created settings for a mineralogical alteration model by taking the initial chemical composition of cementitious materials from analysis results in experiments and applying their ratios to certain hydrated cement minerals, then added settings for secondary generated minerals in order to account for Ca leaching. This study of alteration estimates for ordinary portland cement (OPC) in groundwater showed that the change in Al and S concentrations in simulated leachate approached values for actual leachate[1]. In the present study, we develop an appropriate mineral alteration model for blended cementitious materials and conduct batch-type leaching experiments that use crushed samples of blast furnace slag cement (BFSC), silica cement (SC), and fly ash cement (FAC). The cement blends in these experiments used OPC blended with blast furnace slag of 70 wt.%, silica cement consisting of an amorphous silica fine powder of 20 wt.%, and fly ash of 30 wt.%. De-ionized water was used as the leaching solution. The solid-liquid ratios in the leaching tests were varied in order to simulate the alteration process of cement hydrates. The compositions of leachate and minerals obtained from leaching tests were compared with those obtained from models using hypothetical settings of mineral composition. We also consider an alteration model that corresponds to the diversity of these materials. As a result of applying the conventional OPC model to blended cementitious materials, the estimated Al concentration in the aqueous solution was significantly different from the measured concentration. We therefore propose an improved model that takes better account of Al behavior by using a more reliable initial mineral model for Al concentration in the solution.

Chemical composition, nutritional and toxicological evaluation of rice (Oryza sativa ) grown in fly ash amended soils

2012 ◽  
Vol 92 (13) ◽  
pp. 2721-2726 ◽  
Author(s):  
Kandlakunta Bhaskarachary ◽  
Punna Ramulu ◽  
Paruchuri Udayasekhararao ◽  
Sangras Bapurao ◽  
Krishnaswamy Kamala ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Fly Ash ◽  
Chemical Composition ◽  
Toxicological Evaluation ◽  
Amended Soils

RadLib: a radiative property model library for CFD

2021 ◽  
pp. 108227
Author(s):  
Victoria B. Stephens ◽  
Sally Jensen ◽  
Isaac Wheeler ◽  
David O. Lignell
Keyword(s):  
Radiative Property ◽  
Model Library ◽  
Property Model

scholarly journals The Impact of Coal Fly Ash Purification on Its Antibacterial Activity

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1002
Author(s):  
Seham Alterary ◽  
Narguess H. Marei
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Fly Ash ◽  
Chemical Composition ◽  
Bacterial Growth ◽  
Broth Culture ◽  
Growth Reduction ◽  
Laser Scattering ◽  
X Ray ◽  
The Impact

Fly ash (FA) is produced from coal power plants’ combustion. FA is used in the concrete industry, as an ingredient in the brick and paving. Knowledge of the chemical composition and toxic metal content in FA is essential for evaluating its environmental risks. This study aimed to assess FA purification effect on its antibacterial activity against Escherichia coli and Bacillus cereus, by calculating percent bacterial reduction. Moreover, centrifugation time effect on the purification process was evaluated. Chemical composition and properties of purified FA were determined and compared with raw FA, using Fourier transform Infrared (FTIR); X-ray diffraction (XRD); X-ray photoelectron spectroscopy (XPS); energy-dispersive X-ray (EDXA); carbon, hydrogen, nitrogen, and sulfur (CHNS) elemental analysis; moisture content; and loss-of-ignition. Particle size was predicted by using dynamic laser scattering, BET and scanning electron microscopy (SEM). The CHNS results showed that purified FA contains the highest carbon content (88.9%), as compared to raw FA (82.1%). The particle size distribution (PSD) of FA microspheres ranges from 48.53 ± 17.9 to 52.98 ± 19.4 µm by using SEM. PSD, using dynamic laser scattering, showed polydispersed and non-uniform size in raw FA, ranging in size from 107.1 to 1027 nm, while purified FA manifests a monodispersed size from 103.3 to 127.3 nm. FA showed the least bacterial growth reduction %, while the purified fly ash (FA2) showed the highest bacterial growth reduction %, as compared to the control bacterial broth culture without fly ash.

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