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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| Format: | Article |
| Language: | English |
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MDPI AG
2021-11-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/11/11/1360 |
| _version_ | 1797510759883735040 |
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| author | Yang Wang Caoning Zhang Lingling Xu |
| author_facet | Yang Wang Caoning Zhang Lingling Xu |
| author_sort | Yang Wang |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T05:35:51Z |
| format | Article |
| id | doaj.art-e265de9034f744a9b9b34b68827e0ff6 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-10T05:35:51Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-e265de9034f744a9b9b34b68827e0ff62023-11-22T22:58:26ZengMDPI AGCrystals2073-43522021-11-011111136010.3390/cryst11111360Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement PasteYang Wang0Caoning Zhang1Lingling Xu2College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaHangzhou Silan Integrated Circuits Co., Ltd., Hangzhou 310023, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaIn 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.https://www.mdpi.com/2073-4352/11/11/1360MgO expansion agentexpansion propertieshydration model |
| spellingShingle | Yang Wang Caoning Zhang Lingling Xu Effect of Mixing Light-Burned MgO with Different Activity on the Expansion of Cement Paste Crystals MgO expansion agent expansion properties hydration model |
| title | 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_short | 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 |
| topic | MgO expansion agent expansion properties hydration model |
| url | https://www.mdpi.com/2073-4352/11/11/1360 |
| work_keys_str_mv | AT yangwang effectofmixinglightburnedmgowithdifferentactivityontheexpansionofcementpaste AT caoningzhang effectofmixinglightburnedmgowithdifferentactivityontheexpansionofcementpaste AT linglingxu effectofmixinglightburnedmgowithdifferentactivityontheexpansionofcementpaste |