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Journal articles on the topic 'Ash fineness distribution'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Banchong, Nilankham, Warangkana Saengsoy, and Somnuk Tangtermsirikul. "STUDY ON MECHANICAL AND DURABILITY PROPERTIES OF MIXTURES WITH FLY ASH FROM HONGSA POWER PLANT." ASEAN Engineering Journal 10, no. 1 (2020): 9–24. http://dx.doi.org/10.11113/aej.v10.15535.

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The use of fly ash in concrete improves several characteristics of conventional cement-based pastes, mortars, and concrete such as reduces heat of hydration, increases strength in long-term and enhances durability. However, types and volume of fly ash affect behavior of resulting pastes, mortars and concrete. In this study, the characteristics of pastes, mortars, and concrete with 20% and 30% binder replacement with a Hongsa fly ash from Laos (FAH3) and two fly ashes from Thailand (FAM and FAB) were studied. Further, mechanical and durability properties of Hongsa fly ash mortars and concrete a

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2

Yu, Bao Ying, Fen Lian Xu, and Yu Xin Gao. "Experimental Study on Particle Size Distribution of Admixtures on the Strength Influence of Low Clinker Cement." Advanced Materials Research 557-559 (July 2012): 1415–19. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1415.

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By testing flexural and compressive strength at different ages, the influence of particle size distribution of slag and fly ash on the strength of LCC (low clinker cement) were systematically studied. The SEM (scanning electron microscope) and laser particle size analyzer were used to study the multi-component cementitious and dense-packing effects of LCC. The results show that the strength development of LCC4 with 30% clinker could completely meet the requirements of P.O 42.5R by varying the type, content or fineness of admixtures; based on a higher fly ash and lower clinker dosage, the stren

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3

Sirenko, H. O., L. M. Soltys, V. P. Svidersky, and I. V. Sulyma. "The Effect of Nature and Parameters of Particle Size Distribution of Graphite on Physical and Mechanical Properties of Polimer Composites based on Aromatic Poliamide." Фізика і хімія твердого тіла 17, no. 4 (2016): 611–20. http://dx.doi.org/10.15330/pcss.17.4.611-620.

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The resultsof studies of the effect of nature and parameters of particle size distribution of graphite on physical and mechanical properties of polymer composites based on aromatic polyamide fenіlon C-2. The particle size of the filler and polymer for the theoretical gamma-distribution parameters (perimeter, thickness and diameter) have different values. Found the influence of fillers (natural graphite different bands), which differed ash content (5-15% and 0,05-2,5%), moisture and grinding fineness (dispersion) on the wear resistance of the samples of the polymer composite. There is non-linea

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4

Ferrero, Franco, Franco Marchese, and Giorgio Fornaro. "Particle Size Analysis of Inorganic Dirt in Raw Wool." Textile Research Journal 58, no. 9 (1988): 526–30. http://dx.doi.org/10.1177/004051758805800906.

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A method of analyzing the particle size of inorganic dirt in raw wool is described. This method was applied to 25 raw wool samples of different origin, type, fineness, and grease and ash content. The results show that the particle size distribution of inorganic dirt is monomodal and approaches a log-normal model. The distribution parameters such as geometric mean diameter and standard deviation were also evaluated. In all samples, the geometric mean diameter was in the range of 9 to 28 micrometers without any correlation with other raw wool characteristics.

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5

Yan, Qiao, and Shi Fu Qin. "High Containing Fly Ash Grouting Material Performance Test of Large Channel Underlying Goaf." Applied Mechanics and Materials 353-356 (August 2013): 1271–76. http://dx.doi.org/10.4028/www.scientific.net/amm.353-356.1271.

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Middle route of South-to-North Water Transfer Project of Yuzhou section of the mined-out area of coal mining area is old, has the characteristics of small coal mine of irregular, no mine distribution, engineering geological conditions are very complicated, decided to adopt the filling grouting treatment after analysis. Because the goaf filling grouting treatment scope, size, slurry material costs become an important factor restricting the engineering project management, and setting strength and fineness requirements of grouting material is relatively low, overall consideration the mined-out ge

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6

Ma, Juntao, Daguang Wang, Shunbo Zhao, Ping Duan, and Shangtong Yang. "Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste." Materials 14, no. 2 (2021): 283. http://dx.doi.org/10.3390/ma14020283.

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The grinding process has become widely used to improve the fineness and performance of fly ash. However, most studies focus on the particle size distribution of ground fly ash, while the particle morphology is also an important factor to affect the performance of cement paste. This article aims at three different kinds of ground fly ash from the ball mill and vertical mill, and the particle morphology is observed by scanning electron microscopy (SEM) to calculate the spherical destruction (the ratio of spherical particles broken into irregular particles in the grinding process of fly ash), whi

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7

Ma, Juntao, Daguang Wang, Shunbo Zhao, Ping Duan, and Shangtong Yang. "Influence of Particle Morphology of Ground Fly Ash on the Fluidity and Strength of Cement Paste." Materials 14, no. 2 (2021): 283. http://dx.doi.org/10.3390/ma14020283.

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The grinding process has become widely used to improve the fineness and performance of fly ash. However, most studies focus on the particle size distribution of ground fly ash, while the particle morphology is also an important factor to affect the performance of cement paste. This article aims at three different kinds of ground fly ash from the ball mill and vertical mill, and the particle morphology is observed by scanning electron microscopy (SEM) to calculate the spherical destruction (the ratio of spherical particles broken into irregular particles in the grinding process of fly ash), whi

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8

Kaplan, Gökhan, Sadık Alper Yildizel, Selçuk Memiş, and Ali Uğur Öztürk. "The Optimization of Calcareous Fly Ash-Added Cement Containing Grinding Aids and Strength-Improving Additives." Advances in Civil Engineering 2018 (2018): 1–9. http://dx.doi.org/10.1155/2018/8917059.

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This is an experimental study which explores the physical, mechanical, and economic factors involved in the production of type CEM II A-B/W cement. In this context, 4 cement additives were used in two different dosages (200 and 800 g/t). Class C fly ash was used for composite cement production at ratios of 5%, 20%, and 35%. It was shown that Blaine fineness increases with the increasing fly ash content. The use of fly ash at ratios of 5% and 20% was not found to have any unfavorable effects on the compressive strength at the early days. It is found that the use of additive for improving the ea

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9

Sanytsky, Myroslav, Tetiana Kropyvnytska, Hanna Ivashchyshyn, and Оksana Rykhlitska. "Eco-efficient blended cements with high volume supplementary cementitious materials." Budownictwo i Architektura 18, no. 4 (2020): 005–14. http://dx.doi.org/10.35784/bud-arch.816.

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The ways of reducing CO2 emissions in the cement industry were analysed for the purposes of implementation of the low carbon development strategy. The optimal solution to this problem is the technologically optimised blended cements with high volume of supplementary cementitious materials of various genesis and fineness. The design of eco-friendly blended cements was achieved by a synergistic combination of the main constituents such as granulated blast furnace slag, superfine zeolite, fly ash and limestone, as well as by optimisation of the their granulometric composition, taking into account

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10

Murko, Vasily, Anatoly Zaostrovsky, Elena Murko, and Mikhail Volkov. "Research of Kinetics of Coal Briquette Drying and Determination of the Optimum Mode Providing Fire and Explosion Safety." E3S Web of Conferences 41 (2018): 01040. http://dx.doi.org/10.1051/e3sconf/20184101040.

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The role coal in power industry is predicted to be increased in future that is caused by its large stocks and depletion of oil and gas fields. Due to production growth, deterioration in mining and geological conditions and broad mechanization of production, the quality characteristics of coals as ash content, particle-size distribution, humidity and sulfur content worsen. Therefore, practically all mined coal requires enriching. The smallgrade and fine concentrates received after enrichment often happen to be unsuitable because of their fineness for further processing or direct use. Therefore

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11

Chen, Ning, Ming Tang, Jing Qi Li, and Hong Liang Liu. "Testing and Evaluation on Fractal Characteristic of Cementing Materials Powder." Advanced Materials Research 374-377 (October 2011): 1848–53. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.1848.

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The cement powder materials are evaluated by fractal theory. Fractal characteristic parameters are analysed and evaluated by the method of laser particle size analyzer, microscope, transmission electron microscope. In this paper, cement powder materials has good self-similarity. Fractal dimension of grading is tested and evaluated by laser particle size analyzer, fractal dimension of cluster is tested by microscope, fractal characteristic of particle distribution is tested by transmission electron microscope. Compared with traditional weight of screen residue and specific surface area, those m

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12

Rivera, Rosa Abnelia, Miguel Ángel Sanjuán, and Domingo Alfonso Martín. "Granulated Blast-Furnace Slag and Coal Fly Ash Ternary Portland Cements Optimization." Sustainability 12, no. 14 (2020): 5783. http://dx.doi.org/10.3390/su12145783.

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Granulated blast-furnace slag (GBFS) and coal fly ash (CFA) are two well-known constituents in Portland cements. Ternary Portland cements (GBFS-CFA-K) provide environmental advantages by reducing Portland cement clinker (K) production and, therefore, promote lower CO2 emissions. Nevertheless, both of them cause a delay in the compressive strength gain. Given that, the early compressive strength for both constituents is low, but they improve the compressive strength at medium and later ages as consequence of the pozzolanic reaction. In this paper, a full factorial design with two levels was dev

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13

Li, Shujun, Qiuyi Li, Xiaolong Zhao, et al. "Experimental Study on the Preparation of Recycled Admixtures by Using Construction and Demolition Waste." Materials 12, no. 10 (2019): 1678. http://dx.doi.org/10.3390/ma12101678.

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The use of construction and demolition waste (CDW) to prepare recycled admixtures is of great significance for the complete resource reutilization of CDW. In this paper, different kinds of CDW were prepared into recycled powder (RP) with a specific particle size (0–45 µm or 0–75 µm). The fineness, water requirement ratio (WRR), fluidity, loss on ignition (LOI), strength activity index (SAI) and compatibility of cement and superplasticizer (CCS) were examined. The above test results were analyzed by advanced analysis tools, such as laser particle size analysis, XRD, XRF, DSC-TGA, SEM, and BET.

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14

Janowska-Renkas, Elżbieta, and Agnieszka Kaliciak. "Properties of geopolymers from conventional fly ash activated at increased temperature with sodium hydroxide containing glass powder obtained from the recycling of waste glass." MATEC Web of Conferences 322 (2020): 01018. http://dx.doi.org/10.1051/matecconf/202032201018.

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This paper presents test results of the physical and mechanical properties of geopolymers based on conventional fly ash activated at increased temperature with sodium hydroxide, containing glass powder obtained from the recycling of waste glass. Tests were performed on mortars of a geopolymer binder containing glass powder of various levels of fineness, at quantities ranging from 5 to 95% of the mass of the conventional fly ash. The properties of the geopolymer binder with and without the content of glass powder were determined on the basis of the heat of hydration. The suitability of the appl

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15

Belosevic, Srdjan, Ivan Tomanovic, Nenad Crnomarkovic, Aleksandar Milicevic, and Dragan Tucakovic. "Modeling and optimization of processes for clean and efficient pulverized coal combustion in utility boilers." Thermal Science 20, suppl. 1 (2016): 183–96. http://dx.doi.org/10.2298/tsci150604223b.

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Pulverized coal-fired power plants should provide higher efficiency of energy conversion, flexibility in terms of boiler loads and fuel characteristics and emission reduction of pollutants like nitrogen oxides. Modification of combustion process is a cost-effective technology for NOx control. For optimization of complex processes, such as turbulent reactive flow in coal-fired furnaces, mathematical modeling is regularly used. The NOx emission reduction by combustion modifications in the 350 MWe Kostolac B boiler furnace, tangentially fired by pulverized Serbian lignite, is investigated in the

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16

Yan, Na, Qingqing Tang, Ying Zhang, and Guowen Sun. "Action Time-Effect and Mechanism of Low-Calcium Fly Ash in Cement-Based Composites." Crystals 11, no. 6 (2021): 681. http://dx.doi.org/10.3390/cryst11060681.

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This study was conducted in order to investigate when low-calcium fly ash plays a physical or chemical effect and what is the chemical effect proportion of low-calcium fly ash. Two types of low-calcium fly ash and quartz powder, with similar fineness as active and inert admixtures, were used as materials in this study. Under different water/binder ratios and hydration ages, the effects of the different types of admixtures and their dosages on the flexural and compressive strength of the composites were studied. X-ray diffraction (XRD), scanning electron microscopy (SEM) and nitrogen adsorption

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17

Stoltenberg-Hansson, Erik. "Fly Ashes Used For Blended Portland Cement: Effect Of Grinding on Cement Quality." MRS Proceedings 136 (1988). http://dx.doi.org/10.1557/proc-136-175.

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ABSTRACTTests have been performed with Class F fly ashes used for the production of interground 20% fly ash cement. Unground and ground fly ashes were mixed with a reference high fineness Portland cement and tested for strength in mortar (ISO/CEN method). The fly ashes were also tested for chemical composition, bulk density and specific gravity, fineness (Blaine) and particle size distribution (laser method). There are considerable variations in the specific weights of the asdelivered fly ashes. It is shown that even a small amount of grinding increases the specific gravity significantly, and

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18

Larbi, Joseph A., and Jan M. Bijen. "Evolution of Lime and Microstructural Development In Fly Ash-Portland Cement Systems." MRS Proceedings 178 (1989). http://dx.doi.org/10.1557/proc-178-127.

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AbstractThe evolution and distribution of calcium hydroxide, CH, and the development of microstructure during the hydration of three low-calcium fly ash-Portland cement blends with water-solids ratio (w/s) of 0.40 have been investigated. During the first month of hydration, the CH content of the blends was found to be relatively higher than the plain mix, if a dilution effect due to replacement of cement by an inert material is taken into account. After 28 days of hydration the CH content in the blends began to decrease. SEM observations of specimens revealed the occurrence of large, well-crys

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19

Mills, Ronald H. "The Practitioners View of Fly Ash Utilisation." MRS Proceedings 178 (1989). http://dx.doi.org/10.1557/proc-178-169.

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AbstractPartial substitution of Portland cement (PC) with fly ash (FA) offers the practitioner expanded scope for optimal utilisation of materials. This method requires careful evaluation of the resulting blended cement beyond the basic age-strength relationship. For the construction practitioner, workability, rate of strength gain, and inherent variability are major factors in meeting strength requirements and determining costs. A blend may be characterised by a mass efficiency factor which is the mass ratio of PC to FAwhich will yield the same target strength at fixed maturity and workabilit

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20

Bhattacharya, Chittatosh. "Capacity Mapping for Optimum Utilization of Pulverizers for Coal Fired Boilers." Journal of Energy Resources Technology 130, no. 3 (2008). http://dx.doi.org/10.1115/1.2955563.

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Pulverizers play a pivotal role in coal-based thermal power generation. Improper coal fineness or drying reflects a qualitywise deterioration. This results in flame instability, unburnt combustible loss, and a propensity to slagging or clinker formation. Simultaneously, an improper air-coal ratio may result in either coal pipe choking or flame impingement, an unbalanced heat release, an excessive furnace exit gas temperature, overheating of the tube metal, etc., resulting in reduced output and excessive mill rejects. In general, the base capacity of a pulverizer is a function of coal and air q

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