Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste

In mass concrete, shrinkage resulting from temperature drop and drying leads to cracking, which can seriously affect the strength and durability of cement-based materials. Fortunately, expansion agents can deter or prevent these effects, especially MgO expansion agents (MEAs). In this study, the eff...

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Autores principales:	Yang Wang, Caoning Zhang, Lingling Xu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	MgO expansion agent expansion properties hydration model Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/e265de9034f744a9b9b34b68827e0ff6
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id	oai:doaj.org-article:e265de9034f744a9b9b34b68827e0ff6
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spelling	oai:doaj.org-article:e265de9034f744a9b9b34b68827e0ff62021-11-25T17:18:50ZEffect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste10.3390/cryst111113602073-4352https://doaj.org/article/e265de9034f744a9b9b34b68827e0ff62021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1360https://doaj.org/toc/2073-4352In mass concrete, shrinkage resulting from temperature drop and drying leads to cracking, which can seriously affect the strength and durability of cement-based materials. Fortunately, expansion agents can deter or prevent these effects, especially MgO expansion agents (MEAs). In this study, the effects of four MEAs of different activity on the expansion properties, strength, and hydration of cement paste were explored. The different expansion phenomena between the high activity and low activity MgO was especially explained by the hydration model and dynamic theory. The results indicate that when the other conditions were the same, higher curing temperature and dosage could improve the expansion to some extent. Moreover, the hydration of high activity MgO and the expansion behavior occurred mainly in the early hydration stage, while the hydration of low activity MgO and the expansion behavior had a high contribution rate in the later stage, and the final expansion of cement mixed with low activity MgO was larger.Yang WangCaoning ZhangLingling XuMDPI AGarticleMgO expansion agentexpansion propertieshydration modelCrystallographyQD901-999ENCrystals, Vol 11, Iss 1360, p 1360 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	MgO expansion agent expansion properties hydration model Crystallography QD901-999
spellingShingle	MgO expansion agent expansion properties hydration model Crystallography QD901-999 Yang Wang Caoning Zhang Lingling Xu Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste
description	In mass concrete, shrinkage resulting from temperature drop and drying leads to cracking, which can seriously affect the strength and durability of cement-based materials. Fortunately, expansion agents can deter or prevent these effects, especially MgO expansion agents (MEAs). In this study, the effects of four MEAs of different activity on the expansion properties, strength, and hydration of cement paste were explored. The different expansion phenomena between the high activity and low activity MgO was especially explained by the hydration model and dynamic theory. The results indicate that when the other conditions were the same, higher curing temperature and dosage could improve the expansion to some extent. Moreover, the hydration of high activity MgO and the expansion behavior occurred mainly in the early hydration stage, while the hydration of low activity MgO and the expansion behavior had a high contribution rate in the later stage, and the final expansion of cement mixed with low activity MgO was larger.
format	article
author	Yang Wang Caoning Zhang Lingling Xu
author_facet	Yang Wang Caoning Zhang Lingling Xu
author_sort	Yang Wang
title	Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste
title_short	Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste
title_full	Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste
title_fullStr	Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste
title_full_unstemmed	Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste
title_sort	effect of mixing light-burned mgo with different activity on the expansion of cement paste
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/e265de9034f744a9b9b34b68827e0ff6
work_keys_str_mv	AT yangwang effectofmixinglightburnedmgowithdifferentactivityontheexpansionofcementpaste AT caoningzhang effectofmixinglightburnedmgowithdifferentactivityontheexpansionofcementpaste AT linglingxu effectofmixinglightburnedmgowithdifferentactivityontheexpansionofcementpaste
_version_	1718412564520501248

Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste

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