Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials

The unburned carbon in fly ash inhibits the performance of concrete. A device using the flotation method to remove unburned carbon in fly ash was developed, and the operating condition of the device was experimentally examined. According to the results, the device was able to remove unburnt carbon f...

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Autores principales:	Hangwei Lin, Koji Takasu, Hidehiro Koyamada, Hiroki Suyama
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	flotation fly ash concrete unburnt carbon Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/28f03a20124749beb0ffdb0d915fd30f
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spelling	oai:doaj.org-article:28f03a20124749beb0ffdb0d915fd30f2021-11-11T18:05:45ZDevelopment of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials10.3390/ma142165171996-1944https://doaj.org/article/28f03a20124749beb0ffdb0d915fd30f2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6517https://doaj.org/toc/1996-1944The unburned carbon in fly ash inhibits the performance of concrete. A device using the flotation method to remove unburned carbon in fly ash was developed, and the operating condition of the device was experimentally examined. According to the results, the device was able to remove unburnt carbon from fly ash by using the installed micro bubble nozzles and a whirl-type pump. The removal efficiency of unburnt carbon improved when prior forced stirring was carried out by a concrete mixer for 3 min, and a scavenger was added into the fly ash slurry at a density of about 60 wt%. It has also been confirmed that the method of circulating water is more effective than the method of not circulating water. The elements of the modified fly ash slurry (MFAS) have also been experimentally confirmed as not being too different from untreated fly ash, except for the fact that the content of unburned carbon is reduced. The compressive strength and drying shrinkage characteristics of concrete made with MFAS were investigated. The use of MFAS will reduce the performance of concrete compared to that of ordinary concrete. This shows that in a certain range (15–30%), the influence of MFAS on drying shrinkage is constant. The static elastic modulus and dynamic elastic modulus were also investigated. The above results show that the application of MFAS prepared by the flotation method to concrete is feasible.Hangwei LinKoji TakasuHidehiro KoyamadaHiroki SuyamaMDPI AGarticleflotationfly ashconcreteunburnt carbonTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6517, p 6517 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	flotation fly ash concrete unburnt carbon Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	flotation fly ash concrete unburnt carbon Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Hangwei Lin Koji Takasu Hidehiro Koyamada Hiroki Suyama Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials
description	The unburned carbon in fly ash inhibits the performance of concrete. A device using the flotation method to remove unburned carbon in fly ash was developed, and the operating condition of the device was experimentally examined. According to the results, the device was able to remove unburnt carbon from fly ash by using the installed micro bubble nozzles and a whirl-type pump. The removal efficiency of unburnt carbon improved when prior forced stirring was carried out by a concrete mixer for 3 min, and a scavenger was added into the fly ash slurry at a density of about 60 wt%. It has also been confirmed that the method of circulating water is more effective than the method of not circulating water. The elements of the modified fly ash slurry (MFAS) have also been experimentally confirmed as not being too different from untreated fly ash, except for the fact that the content of unburned carbon is reduced. The compressive strength and drying shrinkage characteristics of concrete made with MFAS were investigated. The use of MFAS will reduce the performance of concrete compared to that of ordinary concrete. This shows that in a certain range (15–30%), the influence of MFAS on drying shrinkage is constant. The static elastic modulus and dynamic elastic modulus were also investigated. The above results show that the application of MFAS prepared by the flotation method to concrete is feasible.
format	article
author	Hangwei Lin Koji Takasu Hidehiro Koyamada Hiroki Suyama
author_facet	Hangwei Lin Koji Takasu Hidehiro Koyamada Hiroki Suyama
author_sort	Hangwei Lin
title	Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials
title_short	Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials
title_full	Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials
title_fullStr	Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials
title_full_unstemmed	Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials
title_sort	development of flotation device for removing unburnt carbon in fly ash for use in hardened cementitious materials
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/28f03a20124749beb0ffdb0d915fd30f
work_keys_str_mv	AT hangweilin developmentofflotationdeviceforremovingunburntcarboninflyashforuseinhardenedcementitiousmaterials AT kojitakasu developmentofflotationdeviceforremovingunburntcarboninflyashforuseinhardenedcementitiousmaterials AT hidehirokoyamada developmentofflotationdeviceforremovingunburntcarboninflyashforuseinhardenedcementitiousmaterials AT hirokisuyama developmentofflotationdeviceforremovingunburntcarboninflyashforuseinhardenedcementitiousmaterials
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Development of Flotation Device for Removing Unburnt Carbon in Fly Ash for Use in Hardened Cementitious Materials

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