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Technological and Environmental Behavior of Coal Fly Ash in Lime-Based Materials 被引量:1
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作者 mamoudou sall Gora Dieye +4 位作者 Alassane Traoré Prince Momar Gueye Saliou Diouf Abdou Ciss Wade Djibril Diop 《Geomaterials》 2022年第2期15-29,共15页
Coal fly ash is considered an industrial by-product derived from coal combustion in thermal power plant. It is one of the most complex anthropogenic materials. Its improper disposal has become an environmental concern... Coal fly ash is considered an industrial by-product derived from coal combustion in thermal power plant. It is one of the most complex anthropogenic materials. Its improper disposal has become an environmental concern and resulted in a waste of recoverable resources. The aim of this paper is to study the physico-chemical characteristics of binders based on coal fly ash and lime in order to develop an eco-cement. The various characterization tests carried out are X-ray fluorescence, X-ray diffraction, compressive strengths, thermophysical properties and setting time. X-ray fluorescence and X-ray diffraction were used to determine the chemical composition and phases of fly ash, lime and binders. This allowed us to see that the chemical composition of fly ash is similar to that of cement. Compressive strengths of mortars containing 20%, 40%, 60% and 80% of fly ash have shown that fly ash has a long-term positive effect which might be related to a pozzolanic activity. The L<sub>3</sub> binder consisting of 60% of coal fly ash and 40% lime has a higher compressive strength than the others. The binder setting start time is greater than that of cement but shorter than that of lime. The study of the thermophysical properties of the L<sub>3</sub> binder shows that it has a higher thermal resistance than cement mortar. Moreover, it heats up less quickly because of its low effusivity compared to that of the latter. This analysis highlighted the principal characteristics that must be taken into account to use coal fly correctly in lime-based materials. 展开更多
关键词 Coal Fly Ash LIME BINDER X-Ray Fluorescence X-Ray Diffraction Thermomechanical Behavior
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Comparative Characteristics of Hydrated Lime with Fine Sewage Sludge Ash (FSSA) and Coal Fly Ash (CFA)
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作者 mamoudou sall Abdou Ciss Wade +7 位作者 Gora Dieye Alassane Traoré Prince Momar Gueye Prince Momar Gueye Saliou Diouf Déthié Thiaw Khalifa Ababacar Diop Djibril Diop 《Journal of Minerals and Materials Characterization and Engineering》 CAS 2022年第5期446-459,共14页
The disposal of waste has become an environmental issue due to the limited available landfilling space. This paper aims to compare the characteristics of hydrated lime with fine sewage sludge ash (FSSA) and coal fly a... The disposal of waste has become an environmental issue due to the limited available landfilling space. This paper aims to compare the characteristics of hydrated lime with fine sewage sludge ash (FSSA) and coal fly ash (CFA). Multiple techniques, X-ray fluorescence (XRF), X-ray diffraction (XRD), the Fourier transform infrared (FTIR), compressive strengths, thermophysical properties, and setting time were used to assess the physicochemical characteristics of the lime-based materials. X-ray fluorescence and X-ray diffraction were used to determine the chemical composition and phases of ashes, lime and binders. The results showed that the chemical composition of ashes is similar to that of cement. Besides glass, the main minerals identified in CFA and FSSA are quartz (SiO<sub>2</sub>) and anhydrite (CaSO<sub>4</sub>). Moreover, calcium aluminium oxide (Ca<sub>3</sub>Al<sub>2</sub>O<sub>6</sub>) was detected for CFA and phosphorus calcium silicate (Ca<sub>2</sub>SiO<sub>4</sub>-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>) for FSSA and minor phases were detected for both. FTIR measurements were carried out to characterize the inorganics components of different samples. Compressive strengths of mortars with different formulations have shown that both have a long-term positive effect which might be related to a pozzolanic activity. For the CFA the L<sub>3</sub> binder consisting of 60% of coal fly ash and 40% lime has a higher compressive strength than the others while for the FSSA the L<sub>4</sub> binder consisting of 80% fine ash and 20% lime has a higher compressive strength than the others. Both binders setting start times are greater than that of cement but shorter than that of lime. The study of the thermophysical properties of binders shows that they have a higher thermal resistance than cement mortar. Moreover, binders heat up less quickly because of their low effusivity compared to cement. Lime-based materials system could be a promising option to both relieve the waste disposal pressure and provide a potential sustainable construction material. 展开更多
关键词 Coal Fly Ash Fine Sewage Sludge Ash LIME BINDER MICROSTRUCTURE Thermomechanical Behavior
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