Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources

As a kind of granular waste with complex composition and alkali corrosiveness, concrete slurry waste (CSW) has severe recycling limitations in the ordinary Portland cement (OPC). Considering this, a new type of geopolymer, prepared by granulated blast furnace slag/fly ash, concrete slurry waste, and...

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Autores principales:	Yingli Gao, Kairui Duan, Shuncheng Xiang, Wei Zeng
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	concrete slurry waste fly ash slag geopolymer properties Technology T
Acceso en línea:	https://doaj.org/article/a5e64912713446668ea0d77e010149d7
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spelling	oai:doaj.org-article:a5e64912713446668ea0d77e010149d72021-11-19T14:36:20ZBasic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources2296-801610.3389/fmats.2021.751585https://doaj.org/article/a5e64912713446668ea0d77e010149d72021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/fmats.2021.751585/fullhttps://doaj.org/toc/2296-8016As a kind of granular waste with complex composition and alkali corrosiveness, concrete slurry waste (CSW) has severe recycling limitations in the ordinary Portland cement (OPC). Considering this, a new type of geopolymer, prepared by granulated blast furnace slag/fly ash, concrete slurry waste, and powdered activators (sodium carbonate and different silicon sources including sodium metasilicate pentahydrate and silica fume), was adopted to conduct a comparative study with the OPC counterpart. In this study, the homogenized CSW was mixed in the OPC and geopolymer with a constant ratio of 50 wt%, respectively. Then the properties were studied in terms of the flowability, setting times, mechanical strengths, and microstructures. The results showed that better flowability (200 mm) could be achieved in the obtained geopolymer than in the OPC reference group (95 mm) by increasing the powdered activators. The setting time of the OPC was significantly shortened due to the addition of CSW. The strengths of geopolymer were supported by the produced C-A-S-H and carbonates, with less chemically bonded water than the hydration products in the reference group. The dominant size of pores in the hardened geopolymer was much smaller than that in the OPC group which was 80 nm. Silica fume could be the alternate of the sodium metasilicate pentahydrate and had an insignificant negative impact on the fresh and hardened properties and microstructures of the geopolymer when the incorporation rate was within 5%.Yingli GaoKairui DuanShuncheng XiangWei ZengFrontiers Media S.A.articleconcrete slurry wastefly ashslaggeopolymerpropertiesTechnologyTENFrontiers in Materials, Vol 8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	concrete slurry waste fly ash slag geopolymer properties Technology T
spellingShingle	concrete slurry waste fly ash slag geopolymer properties Technology T Yingli Gao Kairui Duan Shuncheng Xiang Wei Zeng Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources
description	As a kind of granular waste with complex composition and alkali corrosiveness, concrete slurry waste (CSW) has severe recycling limitations in the ordinary Portland cement (OPC). Considering this, a new type of geopolymer, prepared by granulated blast furnace slag/fly ash, concrete slurry waste, and powdered activators (sodium carbonate and different silicon sources including sodium metasilicate pentahydrate and silica fume), was adopted to conduct a comparative study with the OPC counterpart. In this study, the homogenized CSW was mixed in the OPC and geopolymer with a constant ratio of 50 wt%, respectively. Then the properties were studied in terms of the flowability, setting times, mechanical strengths, and microstructures. The results showed that better flowability (200 mm) could be achieved in the obtained geopolymer than in the OPC reference group (95 mm) by increasing the powdered activators. The setting time of the OPC was significantly shortened due to the addition of CSW. The strengths of geopolymer were supported by the produced C-A-S-H and carbonates, with less chemically bonded water than the hydration products in the reference group. The dominant size of pores in the hardened geopolymer was much smaller than that in the OPC group which was 80 nm. Silica fume could be the alternate of the sodium metasilicate pentahydrate and had an insignificant negative impact on the fresh and hardened properties and microstructures of the geopolymer when the incorporation rate was within 5%.
format	article
author	Yingli Gao Kairui Duan Shuncheng Xiang Wei Zeng
author_facet	Yingli Gao Kairui Duan Shuncheng Xiang Wei Zeng
author_sort	Yingli Gao
title	Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources
title_short	Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources
title_full	Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources
title_fullStr	Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources
title_full_unstemmed	Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources
title_sort	basic properties of fly ash/slag -concrete slurry waste geopolymer activated by sodium carbonate and different silicon sources
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/a5e64912713446668ea0d77e010149d7
work_keys_str_mv	AT yingligao basicpropertiesofflyashslagconcreteslurrywastegeopolymeractivatedbysodiumcarbonateanddifferentsiliconsources AT kairuiduan basicpropertiesofflyashslagconcreteslurrywastegeopolymeractivatedbysodiumcarbonateanddifferentsiliconsources AT shunchengxiang basicpropertiesofflyashslagconcreteslurrywastegeopolymeractivatedbysodiumcarbonateanddifferentsiliconsources AT weizeng basicpropertiesofflyashslagconcreteslurrywastegeopolymeractivatedbysodiumcarbonateanddifferentsiliconsources
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Basic Properties of fly Ash/Slag -Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources

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