Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature

This paper presents the effects of alkali-activated blast furnace slag and fly ash (AASF) paste added with waste ceramic powder (WCP) on mechanical properties, weight loss, mesoscopic cracks, reaction products, and microstructure when exposed to 300, 600, and 900 °C. Using waste ceramic powder to re...

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Autores principales:	Gui-Yu Zhang, Sung-Chul Bae, Run-Sheng Lin, Xiao-Yong Wang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	waste ceramic powder alkali-activated slag fly ash high temperature compressive strength reaction product meso-crack Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/c3a9f86d7d8c462a82158ab170ba3526
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spelling	oai:doaj.org-article:c3a9f86d7d8c462a82158ab170ba35262021-11-11T18:47:38ZEffect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature10.3390/polym132137972073-4360https://doaj.org/article/c3a9f86d7d8c462a82158ab170ba35262021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4360/13/21/3797https://doaj.org/toc/2073-4360This paper presents the effects of alkali-activated blast furnace slag and fly ash (AASF) paste added with waste ceramic powder (WCP) on mechanical properties, weight loss, mesoscopic cracks, reaction products, and microstructure when exposed to 300, 600, and 900 °C. Using waste ceramic powder to replace blast furnace slag and fly ash, the replacement rate was 0–20%. The samples cured at 45 °C for 28 days were heated to 300, 600, and 900 °C to determine the residual compressive strength and weight loss at the relevant temperature. We evaluated the deterioration of the paste at each temperature through mesoscopic images, ultrasonic pulse velocity (UPV), thermogravimetric analysis (TG), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and with a scanning electron microscope (SEM). Relevant experimental results show that: (1) with the increase in waste ceramic powder content, the compressive strength of samples at various temperatures increased, and at 300 °C, the compressive strength of all the samples reached the highest value; (2) the residual weight increased with the increase in the content of the waste ceramic powder; (3) with a further increase in temperature, all the samples produced more mesoscopic cracks; (4) at each temperature, with the rise in waste ceramic powder content, the value of the ultrasonic pulse velocity increased; (5) the TG results showed that, as the content of waste ceramic powder increased, the formation of C-A-S-H gel and hydrotalcite decreased; (6) XRD and FTIR spectra showed that, at 900 °C, the use of waste ceramic powder reduced the formation of harmful crystalline phases; (7) the SEM image showed that, at 900 °C, as the content of waste ceramic powder increased, the compactness of the sample was improved. In summary, the addition of waste ceramic powder can improve the mechanical properties of the alkali-activated paste at high temperatures, reduce the occurrence of cracks, and make the microstructure denser.Gui-Yu ZhangSung-Chul BaeRun-Sheng LinXiao-Yong WangMDPI AGarticlewaste ceramic powderalkali-activated slag fly ashhigh temperaturecompressive strengthreaction productmeso-crackOrganic chemistryQD241-441ENPolymers, Vol 13, Iss 3797, p 3797 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	waste ceramic powder alkali-activated slag fly ash high temperature compressive strength reaction product meso-crack Organic chemistry QD241-441
spellingShingle	waste ceramic powder alkali-activated slag fly ash high temperature compressive strength reaction product meso-crack Organic chemistry QD241-441 Gui-Yu Zhang Sung-Chul Bae Run-Sheng Lin Xiao-Yong Wang Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature
description	This paper presents the effects of alkali-activated blast furnace slag and fly ash (AASF) paste added with waste ceramic powder (WCP) on mechanical properties, weight loss, mesoscopic cracks, reaction products, and microstructure when exposed to 300, 600, and 900 °C. Using waste ceramic powder to replace blast furnace slag and fly ash, the replacement rate was 0–20%. The samples cured at 45 °C for 28 days were heated to 300, 600, and 900 °C to determine the residual compressive strength and weight loss at the relevant temperature. We evaluated the deterioration of the paste at each temperature through mesoscopic images, ultrasonic pulse velocity (UPV), thermogravimetric analysis (TG), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and with a scanning electron microscope (SEM). Relevant experimental results show that: (1) with the increase in waste ceramic powder content, the compressive strength of samples at various temperatures increased, and at 300 °C, the compressive strength of all the samples reached the highest value; (2) the residual weight increased with the increase in the content of the waste ceramic powder; (3) with a further increase in temperature, all the samples produced more mesoscopic cracks; (4) at each temperature, with the rise in waste ceramic powder content, the value of the ultrasonic pulse velocity increased; (5) the TG results showed that, as the content of waste ceramic powder increased, the formation of C-A-S-H gel and hydrotalcite decreased; (6) XRD and FTIR spectra showed that, at 900 °C, the use of waste ceramic powder reduced the formation of harmful crystalline phases; (7) the SEM image showed that, at 900 °C, as the content of waste ceramic powder increased, the compactness of the sample was improved. In summary, the addition of waste ceramic powder can improve the mechanical properties of the alkali-activated paste at high temperatures, reduce the occurrence of cracks, and make the microstructure denser.
format	article
author	Gui-Yu Zhang Sung-Chul Bae Run-Sheng Lin Xiao-Yong Wang
author_facet	Gui-Yu Zhang Sung-Chul Bae Run-Sheng Lin Xiao-Yong Wang
author_sort	Gui-Yu Zhang
title	Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature
title_short	Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature
title_full	Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature
title_fullStr	Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature
title_full_unstemmed	Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature
title_sort	effect of waste ceramic powder on the properties of alkali–activated slag and fly ash pastes exposed to high temperature
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c3a9f86d7d8c462a82158ab170ba3526
work_keys_str_mv	AT guiyuzhang effectofwasteceramicpowderonthepropertiesofalkaliactivatedslagandflyashpastesexposedtohightemperature AT sungchulbae effectofwasteceramicpowderonthepropertiesofalkaliactivatedslagandflyashpastesexposedtohightemperature AT runshenglin effectofwasteceramicpowderonthepropertiesofalkaliactivatedslagandflyashpastesexposedtohightemperature AT xiaoyongwang effectofwasteceramicpowderonthepropertiesofalkaliactivatedslagandflyashpastesexposedtohightemperature
_version_	1718431727163015168

Effect of Waste Ceramic Powder on the Properties of Alkali–Activated Slag and Fly Ash Pastes Exposed to High Temperature

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