CFBC Bottom Ash as Fine Active Filler for High Performance Composite Building Materials

2017 ◽  
Vol 755 ◽  
pp. 90-95 ◽  
Author(s):  
Rostislav Šulc ◽  
Petr Formáček
Keyword(s):  
High Performance ◽  
Building Materials ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Diffraction Method ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Physical Parameters ◽  
Fluidized Bed Combustion ◽  
High Performance Composite

This article presents the results of the bottom ash from Circulating fluidized Bed Combustion (CFBC). Ashes were modified by grinding in their physical parameters. For this treatment was used the tumbling ball mill at CTU in Prague. In this case were used bottom ashes from Ledvice power plant. Samples of bottom ash were milled in specific amounts and grinding times. The modified samples were tested for the effect of amount of bottom ash in the mill and grinding time on its granulometry. For this testing was used laser diffraction method with particle size analyzer. Milling seems to be great way to get material with better physical and mechanical properties. The reason for this experiment was to better understand behaviour of bottom ash during grinding and made fine filler with specific features for composite building material with high strength.

Grindability of CFBC Fly Ash and High Temperature Fly Ash

2016 ◽  
Vol 722 ◽  
pp. 100-107
Author(s):  
Rostislav Šulc ◽  
Martin Vašák ◽  
Jaromír Poláček
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Power Plant ◽  
Circulating Fluidized Bed ◽  
Physical And Mechanical Properties ◽  
Physical Parameters ◽  
Fluidized Bed Combustion ◽  
Particle Size Analyzer ◽  
Cfbc Fly Ash ◽  
Circulating Fluidized Bed Combustion

This article presents the results of fly ash from Circulating fluidized Bed Combustion (CFBC) and high temperature fly ash (defined in EN 450-1) with modified physical parameters by grinding. For this treatment was used the mechanical mill. In this case were used two fly ashes. The first sample was from Tisová power plant (CFBC fly ash) and the second one from Počerady power plant (high temperature fly ash). The modified samples were tested for the effect of grinding time on its grindability and granulometry. For testing of samples was used laser diffraction with particle size analyzer and the grindability was determined. The reason for this step was found more stable and better material which achieves better physical and mechanical properties. The first step is mechanical treatment of fly ash’s granule.

scholarly journals Hydrogen-Bonding-Aided Fabrication of Wood Derived Cellulose Scaffold/Aramid Nanofiber into High-Performance Bulk Material

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5444
Author(s):  
Xiaoshuai Han ◽  
Weijie Wu ◽  
Jingwen Wang ◽  
Zhiwei Tian ◽  
Shaohua Jiang
Keyword(s):  
Hydrogen Bonding ◽  
Hybrid Material ◽  
High Performance ◽  
Building Materials ◽  
Bulk Material ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Specific Strength ◽  
Cellulose Microfibers ◽  
Natural Wood

Preparing a lightweight yet high-strength bio-based structural material with sustainability and recyclability is highly desirable in advanced applications for architecture, new energy vehicles and spacecraft. In this study, we combined cellulose scaffold and aramid nanofiber (ANF) into a high-performance bulk material. Densification of cellulose microfibers containing ANF and hydrogen bonding between cellulose microfibers and ANF played a crucial role in enhanced physical and mechanical properties of the hybrid material. The prepared material showed excellent tensile strength (341.7 MPa vs. 57.0 MPa for natural wood), toughness (4.4 MJ/m3 vs. 0.4 MJ/m3 for natural wood) and Young’s modulus (24.7 GPa vs. 7.2 GPa for natural wood). Furthermore, due to low density, this material exhibited a superior specific strength of 285 MPa·cm3·g−1, which is remarkably higher than some traditional building materials, such as concrete, alloys. In addition, the cellulose scaffold was infiltrated with ANFs, which also improved the thermal stability of the hybrid material. The facile and top-down process is effective and scalable, and also allows one to fully utilize cellulose scaffolds to fabricate all kinds of advanced bio-based materials.

Utilization of Circulating Fluidized Bed Combustion (CFBC) Fly Ash and Coal-Fired Fly Ash in Portland Cement

2014 ◽  
Vol 629-630 ◽  
pp. 306-313 ◽  
Author(s):  
Mao Chieh Chi ◽  
Ran Huang ◽  
Te Hsien Wu ◽  
Toun Chun Fou
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Fluidized Bed ◽  
Building Materials ◽  
Circulating Fluidized Bed ◽  
Setting Time ◽  
Fluidized Bed Combustion ◽  
Initial Setting Time ◽  
Cfbc Fly Ash ◽  
Circulating Fluidized Bed Combustion

Circulating fluidized bed combustion (CFBC) fly ash is a promising admixture for construction and building materials due to its pozzolanic activity and self-cementitious property. In this study, CFBC fly ash and coal-fired fly ash were used in Portland cement to investigate the pozzolanic and cementitious characteristics of CFBC fly ash and the properties of cement-based composites. Tests show that CFBC fly ash has the potential instead of cementing materials and as an alternative of pozzolan. In fresh specimens, the initial setting time of mortars increases with the increasing amount of cement replacement by CFBC fly ash and coal-fire fly ash. In harden specimens, adding CFBC fly ash to replace OPC reduces the compressive strength. Meanwhile, CFBC fly ash would results in a higher length change when adding over 30%. Based on the results, the amount of CFBC fly ash replacement cement was recommended to be limited below 20%.

scholarly journals Concrete based on sulfur binder being modified with inorganic additives

2018 ◽  
Vol 212 ◽  
pp. 01013
Author(s):  
Vadim Balabanov ◽  
Victor Baryshok ◽  
Nikita Epishkin
Keyword(s):  
Frost Resistance ◽  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Strength Properties ◽  
Climatic Conditions ◽  
Freezing And Thawing ◽  
Concrete Mixtures ◽  
Irkutsk Region ◽  
Water Saturated

The sharply continental climate of the Irkutsk region is characterized by wide temperature intervals throughout the year. The repeated cyclicity of freezing and thawing of building materials in the water-saturated state influences the change in technical characteristics and the durability of concrete products and structures. The concrete products’ features in such climatic conditions create the need for the production of concretes with improved indicators of physical and mechanical properties. The effect of modifying additives on the technological characteristics of sulfur concrete is established. The effect of all elements of sulfur concrete on its strength and frost resistance. The composition of sulfuric concrete is obtained, which meets all the requirements and also has high strength and increased frost resistance. Formulations with a certain ratio of structural sulfuric concrete mixtures were developed. As a result of the use of technical sulfur in the composition of concrete products, the problem of utilizing annually accumulating reserves of technical sulfur is partially solved. The strength properties of sulfuric concretes easily compete with high-quality brands of concrete, special types of concretes that have in their composition additives.

The Study of Creep and Deformation Properties of Sulfur-Containing Arbolit Exposed to Various Compression Stresses

2021 ◽  
Vol 899 ◽  
pp. 137-143
Author(s):  
Yulia A. Sokolova ◽  
Marina A. Akulova ◽  
Baizak R. Isakulov ◽  
Alla G. Sokolova ◽  
Berikbay B. Kul’sharov ◽  
...  
Keyword(s):  
Stress Level ◽  
Creep Deformation ◽  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Experimental Tests ◽  
Theory And Practice ◽  
Wall Material ◽  
Deformation Properties ◽  
Sulfur Containing

The present paper considers the study of creep and deformation properties of sulfur-containing arbolit exposed to various compression stresses. Investigating the creep of lightweight arbolit concretes greatly affecting the performance of bearing and envelope structures draws a special attention during the last years. This issue is of particular relevance in the regions with hot and sharp continental climate. Arbolit concrete is one of the lightest building materials with low thermal conductivity and good soundproof properties. The modern postulates of theory and practice of creation, development of high-strength arbolit concretes on the base of composite sulfur-containing binders have become the methodological framework of the present research. While carrying out scientific research, the following standard measuring and analysis methods of physical and mechanical properties have been used for sulfur-containing arbolit composites. Experimental tests have been implemented on the 28-days samples made of sulfur-containing arbolit, with the cotton plant footstalks as an organic component. The researched samples were vapor sealed with the purpose to eliminate overlapping the processes of contraction and creep. The experimental results have shown that the analysis of prisms deformation in time demonstrates certain derivation from the pattern. Deformation of prisms made of sulfur-containing arbolit loaded at the low stress level were growing at a slower rate that the same deformations at a higher stress level. No derivation has been observed for the prisms of sulfur-containing haydite concrete. For both types of concrete, creep deformation has reached the values exceeding completely recoverable deformation by a factor of 2 or all the samples, the rapid growth of creep deformation has been observed after loading, followed by the gradual slowdown of deformation growth. For sulfur-containing lightweight concretes, as the test shown, the rate of creep deformation growth depends on the hardening curve in time reflecting the process of concrete hardening. This, if compared with sulfur-containing lightweight concretes, creep of sulfur-containing arbolit concrete is significantly lower that eventually leads to the loss of creep deformation at the same stress level. The obtained results can be used when manufacturing an efficient wall material for residential construction, including seismic areas.

scholarly journals Leaching Characteristics of Low Concentration Rare Earth Elements in Korean (Samcheok) CFBC Bottom Ash Samples

2019 ◽  
Vol 11 (9) ◽  
pp. 2562 ◽  
Author(s):  
Lai Tuan ◽  
Thriveni Thenepalli ◽  
Ramakrishna Chilakala ◽  
Hong Vu ◽  
Ji Ahn ◽  
...  
Keyword(s):  
Rare Earth ◽  
Power Plants ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Coal Ash ◽  
Low Grade ◽  
Fluidized Bed Combustion ◽  
Basic Characteristics ◽  
Mass Volume ◽  
Circulating Fluidized Bed Combustion

Coal-derived power comprises over 39% of the world’s power production. Therefore, a mass volume of coal combustion byproducts are generated and shifted the extra burden onto the economy and environment. Circulating fluidized bed combustion (CFBC) has been found to be a clean and ultimate technology for Korea’s coal-fired power plants to have effective power generation from low-grade imported coal with reduced emissions. Efforts have been made to broaden the utilization of CFBC coal ash, and to promote sustainable development of CFBC technology. Investigations provided numerous evidences for coal ash to be a potential deposit for rare earths reclamation. However, the basic characteristics and the methods of rare earth mining from the CFBC bottom ash lack detailed understanding and are poorly reported. This study highlighted an insight of the CBFC bottom ash with respect to REEs concentration. Moreover, agents were tested as a means for leaching REEs from Samcheok CFBC bottom ash. The leaching tests were performed in relation to variations in concentration, time and temperature. The results were applied to identify suitable processes to leach REEs from the ash and clarify the potential valuation of CFBC bottom ash. The leaching conditions attained by ANOVA analysis for hydrochloric concentration, temperature, and time of 2 mol L−1, 80 °C, and 12 h, were found to provide a maximum extraction of yttrium, neodymium and dysprosium of 62.1%, 55.5% and 65.2%, respectively.

High Performance of the CFBC Pilot Plant with CO2 Chemical Absorption by Optimizing the Absorber Parameters

2013 ◽  
Vol 746 ◽  
pp. 3-8
Author(s):  
Cristian Dinca ◽  
Adrian Badea ◽  
Horia Necula
Keyword(s):  
Flue Gas ◽  
High Performance ◽  
Gas Flow ◽  
Circulating Fluidized Bed ◽  
Energy Requirement ◽  
Combustion Process ◽  
Process Efficiency ◽  
Solution Temperature ◽  
Fluidized Bed Combustion ◽  
Capture Process

The objective of this paper consists to identify the influence of absorption process temperature and pressure on the energy requirement of the CO2 chemical capture process. The study aimed to reducing CO2 emissions from coal combustion process in the circulating fluidized bed combustion (CFBC). The post-combustion CO2 capture process was analyzed using primary amine MEA in the following conditions: the ratio L/G was varied between 0.45..1.6 kgliquid/kggas keeping constant the flue gas flow and varying the solvent flow between 500 .. 1 600 kg/h. The CO2 capture process efficiency was maintained constant around 90%. For a concentration of 30% MEA in solution, it was observed that when the absorber solution temperature increasing from 32 to 49 °C, the amount of heat required for the solvent regeneration increased from 2.1 to 3.3 GJ/tCO2 according to the solvent pressure and flue gas pressure respectively. On the other hand, for varying the absorber solvent pressure in the range 1.1 .. 2.1 atm, the heat required by the process was not significantly influenced. Considering the same variation of the absorber solvent temperature, the rich loading solvent was increased from 0.43 to 0.57 mol CO2/mol MEA and consequently the MEA capacity of CO2 absorption from 0.3 to 0.422 molCO2/mol MEA.

scholarly journals PROKNOW-C: DA SELEÇÃO DE UM PORTFÓLIO DE ARTIGOS A ANÁLISE SISTÊMICA SOBRE BLOCOS DE TERRA COMPRIMIDA

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Sâmara França ◽  
Mariana Rezende Schuab ◽  
Kastelli Pacheco Sperandio ◽  
Rogério Cabral de Azevedo ◽  
Maria Cristina Ramos de Carvalho ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Bottom Ash ◽  
Fluidized Bed Combustion ◽  
Circulating Fluidized Bed Combustion

Blocos de terra compactada são elementos de alvenaria feitos a partir de terra estabilizada e adensada. Estes materiais se destacam no quesito sustentabilidade por dispensarem a fase de queima em sua produção. A estabilização química dos blocos pode ser realizada através da ativação alcalina que consiste na obtenção de ligantes a partir de materiais aluminossilicatos em uma solução fortemente alcalina. A ativação alcalina também é vista como ambientalmente correta devido a sua baixa emissão de gases do efeito estufa.  Entre os materiais precursores da ativação alcalina estão as cinzas volantes devido a sua composição química. Diante desse contexto, o objetivo deste trabalho é montar um portfólio de artigos científicos sobre blocos de terra compactado com adição de cinzas orgânicas e ativação alcalina, fazer análise bibliométrica e sistêmica dos artigos. O portfólio bibliográfico resultante é composto por 4 artigos relevantes e alinhados com o tema. Dentro da análise bibliométrica pode-se destacar o artigo “Feasibility o fmanufacturing geopolymer bricks using circulating fluidized bed combustion bottom ash” como mais relevante. Em relação a análise sistêmica elencou-se 5 lentes para a discussão dos artigos e a partir disso pode-se observar oportunidades para futuras pesquisas.

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