Fuel additive technology is based on the use of a solid, fuel additive (iron, aluminium, calcium and silicon based oxides), to reduce NOx emission, improve the quality of fly ash and result in 1–3% coal savings for pulverised coal combustion.The findings in this study have been mainly based on extensive experimentation on 100 kWth down fired …
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Fly ash is a byproduct from burning pulverized coal in electric power generating plants. During combustion, mineral impurities in the coal (clay, feldspar, quartz, and shale) fuse in suspension and float out of the combustion chamber with the exhaust gases. As the fused material rises, it cools and solidifies into spherical glassy particles ...
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Based on the experimental data, a correlation was developed to predict the relative viscosity of ash slurries as a function of total solids fly ash in the range of 10-40% (by weight) and, additive ...
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The pozzolanic reaction of a class C fly ash to concrete caused a significant reduction in permeability [4,32,37]. Due to this cementitious characteristic, it is reasonable to investigate the potential and constraints of fly ash utilization as an additive in various drilling fluid formulations.
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EN 197-1 allows the addition of pure fly ash of up to 20 per cent (CEM II/A) while for CEM II/B a maximum of 35 per cent is permitted. Blended cement using other supplementary cementitious materials. (SCMs) are allowed a total content of up to 55 per cent (ie, Type CEM IV/B pozzolanic cement). ASTM C595 allows up to 40 per cent of fly ash (Type ...
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The fly-ash specimen has taken from Tata Tinplate Company Ltd, Jamshedpur, India. Experiments were carried out on a fly ash sample. A pycnometer technique was utilized to obtain the specific gravity of the fly-ash, which was 2.515. A MCR 92 rheometer was used to evaluate the rheological behavior of the fly ash-water slurry …
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A low-calcium fly ash (FA)-based geopolymer is prepared by incorporating salt-loss soda residue (SLSR). • Oxalic acid (OA) was used to pretreat SLSR in fly ash-based geopolymer. • The addition of 20% SLSR improves the 90-d flexural and compressive strengths of samples incorporating OA. •
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Fly-ash additives are added to lubricating oils to improve oxidation resistance and prevent deposit formation, which may reduce viscosity loss at high temperatures. …
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Fly ash's particle size is finer than ordinary Portland cement's. Fly ash comprises silt-sized particles that are typically spherical in shape and range in size from 10 to 100 μm. One of the key characteristics influencing fly ash's pozzolanic reactivity is its fineness. The chemical and mineral composition of fly ash determines its color.
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The ash produced in India usually has higher specific gravity as Indian coal has a much higher content of non-combustible matter. Also, the majority of the thermal power plant in India disposes of both the materials, namely fly ash and bottom ash to ash ponds using the same pipeline. The knowledge of slurry rheology is very vital for the …
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This research studied the improvement of the geopolymerization of bottom ash (BA) by incorporating fly ash (FA) and using flue gas desulfurization gypsum (FGDG) as additive. The BA:FA ratios of 100:0, 75:25, 50:50, 25:75, and 0:100 were used as the blended source materials. The source materials were then replaced with 0%, 5%, 10%, …
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Adding fly ash increases the soil's UCS up to a specific limit, beyond which a decrease in strength occurs. The fly ash's pozzolanic reaction between SiO 2, Al 2 O 3, and CaO forms cementitious compounds that bind soil particles together. CFA is more effective than FFA …
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General appearance of fly ash LOI 2% from CBO-OTEO LB The blend CEM II/A-V 42.5 has the same constituents and particles as CEM I 52.5 N above, that is Portland clinker grains with a phase of ...
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Chandel et al. [1] studied the effect of Henko detergent and sodium-hexa-meta phosphate (in the ratio of 1:5) as an additive on coal fly ash slurry suspension rheological behavior at higher solid ...
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Research has been carried out on the optimization of the Use of Lahat Fly Ash as an Additive Portland Composite Cement (PCC) ... TABLE 4. Loss of Ignition (LOI) Test Results. Standard Loss of Proportion of Fly Loss of Ignition Ignition Ash (%) (%) SNI 7064:2014 (%) 6 10 14 9.65 - 9.56 9.60 LOI is the level of lost incandescent of cement or ...
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Fig. 8 presents alumina extraction of coal fly ash mixed with the mixture additives containing NaOH and Na 2 CO 3 with the weight ratio of NaOH, Na 2 CO 3 and coal fly ash being 1:1:2. The extraction of Al 2 O 3 was about 52% at 400 °C which was close to that of FA-NaOH (53%) at the same temperature.
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Fly ash can be used in an effective way to treat domestic wastewater with simple techniques and low-cost adsorbents (Akar, 2010, Aljerf, 2018a, Aljerf, 2018b). Fly …
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The ANOVA was also used to test for the Blaine fineness for the Optimization of Calcareous Fly Ash-Added Cement Containing Grinding Aids and Strength-Improving Additives (Kaplan et al., 2018). The ...
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When OPC was used as an additive in high calcium fly ash geopolymer 30, the final setting time was greatly reduced from 47 to 10 min for 10 M NaOH concentration. These materials are suitable for use as a repair binder. ... Weight loss was high for the limestone additive, resulting in a remaining weight of 82%. However, ...
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Lime, on the other hand, is a commercial quicklime supplied by Lafarge Calcinor, with a purity of 88% and a reactivity of t 60 = 2.37min, used as an additive to activate fly ash. The choice of this type of lime was motivated by the fact that it is used very little by researchers who prefer to work with slaked lime instead.
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Mingyu et. al [59] also reported the effect of 10% Mg 2 SO 4 on a fly-ash based geopolymer concrete activated with NaOH and CaO together as an activator with two different types of additives ...
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Fly ash (FA) is a by-product of the coal dust combustion process in heat plants and power plants, and after passing the certification process, it can be used as an additive to concrete. The use ...
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When OPC was used as an additive in high calcium fly ash geopolymer 30, the final setting time was greatly reduced from 47 to 10 min for 10 M NaOH concentration. These materials are suitable for ...
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For 7 d aged geopolymers based on the 90% fly ash + 10% calcite blend, the strength was 8.0-, 3.5- and 2.9-fold higher than that for the geopolymers based on the unblended fly ash for 30 s, 180 s ...
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The findings demonstrate that the inclusion of 0.5% fly ash additive in the lubricant oil results in a significant reduction in both scratch width and weight loss of the balls. However, it should be noted that higher additive ratios may lead to increased scratch width and weight loss due to the agglomeration of the fly ash particles on the ...
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Nano-silica (NS) may counteract the drawbacks of fly ash (FA), such as delayed setting and low early strength, by accelerating hydration and providing higher …
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The loss on ignition (LoI) was determined as a weight difference between 20° and 1000 °C. Table 1. Chemical composition of raw materials used in the mix design of experimental binders. ... The S 1 binder with fly ash additive (Fig. 8 b) appears more rigid in comparison with S 0. The average size of fly ash grain is comparatively smaller to ...
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A geopolymer binder is measured as an alternative and elective material to customary Portland binders. Utilization of Fly ash (FA) as a primary binding material limits the waste creation of thermal power stations and reduces environmental impacts. This paper presents the strength performance of geopolymer concrete (GC) with different …
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Adding 3.0 wt.% Class F fly ash (brown coal) increased the apparent viscosity, plastic viscosity, yield point and gel strength by 23%, 28%, 9% and 25%, resp. …
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The findings demonstrate that the inclusion of 0.5% fly ash additive in the lubricant oil results in a significant reduction in both scratch width and weight loss of the balls.
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The findings demonstrate that the inclusion of 0.5% fly ash additive in the lubricant oil results in a significant reduction in both scratch width and weight loss of the …
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ASTM C618-17a (2017) outlines the requirements of fly ash for use in concrete as a mineral additive. Fly ash typically is used at a replacement rate of 20%–40% of ordinary Portland cement. Fly ash can reduce the rate of slump loss of concrete under hot weather conditions, and this reduction in slump loss is inversely proportional to the ...
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The feasibility of using fly ash as an additive in ilmenite-densified water-based mud to safely mitigate sagging in a highly deviated geothermal well was established. The static setting was determined in inclined positions and over a range of angles of inclinations (30 0, 45 0, 60 0, 70 0, 80 0, and 90 0 ) case at different temperatures ...
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A content of particles with diameter below 45 µm should be within a range 80 ÷ 90%, whereas the loss on ignition should not exceed 4%, ... It was found that in the case of geopolymer composites containing by mass of fly ash and the additive of graphene P1 and hydrophobic nanosilica (HF), the most favourable parameters of …
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An additive-free glass-ceramics was prepared entirely from municipal solid waste incineration bottom ash (BA) and coal fly ash (CFA), which provided new sight for the synthesis of waste-derived glass-ceramics and reduced its production cost. ... The chemical stability was evaluated by the weight loss ratio after being soaked in 10% …
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The mixed geopolymer had lower fluid loss without using any fluid loss control additive that made it a good candidate for cementing applications such as horizontal drilling, gas migration risk ...
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Dry beneficiation of three high loss-on-ignition (LOI) fly ashes were conducted. The combination of two different types of dry separation techniques—ultrasonic sieving and triboelectrostatic separation—were used for this study. The results indicate that a simple separation of unburned carbon from fly ash is achievable at particle sizes of ...
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addition of fly ash) and a decrease in CaO content of 59,74% (PCC cement without the addition of fly. ash) to 50,85% (PCC cement with 28% the addition of fly ash) and SO content from 1,98% (PCC ...
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