Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar
Despite having a high early mechanical strength and using sulfoaluminate cement as the primary cementitious material, self-compacting repair mortar (SCRM) suffers from rapid hydration rates leading to construction time constraints. This study examined how several forms of calcium sulfate, including...
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| Format: | Article |
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MDPI AG
2023-08-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/16/5648 |
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| author | Hao Ding Xuepeng Shen Aili Chen Rulin Gu Ying Fang Dongxu Li |
| author_facet | Hao Ding Xuepeng Shen Aili Chen Rulin Gu Ying Fang Dongxu Li |
| author_sort | Hao Ding |
| collection | DOAJ |
| description | Despite having a high early mechanical strength and using sulfoaluminate cement as the primary cementitious material, self-compacting repair mortar (SCRM) suffers from rapid hydration rates leading to construction time constraints. This study examined how several forms of calcium sulfate, including hemihydrate gypsum, anhydrite, and dihydrate gypsum, affected SCRM’s workability, hydration process, and microstructure. The outcomes demonstrated that adding hemihydrate gypsum sped up SCRM’s early hydration rate and boosted its expansion rate. For a cement with 8% hemihydrate gypsum, 6 h after adding the water, the flexural strength and compressive strength increased by 39.02% and 34.08%, respectively. The hydration rate of SCRM can be efficiently delayed by dihydrate gypsum, although the result is subpar. The material exhibited the lowest fluidity loss in 20 min, the setting time was extended, and the 28-day flexural and compressive strengths were raised by 26.56% and 28.08%, respectively, after adding 8 percent anhydrite. |
| first_indexed | 2024-03-10T23:46:33Z |
| format | Article |
| id | doaj.art-71701bc9aca346449272385d76cc846f |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T23:46:33Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-71701bc9aca346449272385d76cc846f2023-11-19T02:00:39ZengMDPI AGMaterials1996-19442023-08-011616564810.3390/ma16165648Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair MortarHao Ding0Xuepeng Shen1Aili Chen2Rulin Gu3Ying Fang4Dongxu Li5College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaNanjing Kunchang New Material Co., Ltd., Nanjing 210000, ChinaNanjing Kunchang New Material Co., Ltd., Nanjing 210000, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210009, ChinaDespite having a high early mechanical strength and using sulfoaluminate cement as the primary cementitious material, self-compacting repair mortar (SCRM) suffers from rapid hydration rates leading to construction time constraints. This study examined how several forms of calcium sulfate, including hemihydrate gypsum, anhydrite, and dihydrate gypsum, affected SCRM’s workability, hydration process, and microstructure. The outcomes demonstrated that adding hemihydrate gypsum sped up SCRM’s early hydration rate and boosted its expansion rate. For a cement with 8% hemihydrate gypsum, 6 h after adding the water, the flexural strength and compressive strength increased by 39.02% and 34.08%, respectively. The hydration rate of SCRM can be efficiently delayed by dihydrate gypsum, although the result is subpar. The material exhibited the lowest fluidity loss in 20 min, the setting time was extended, and the 28-day flexural and compressive strengths were raised by 26.56% and 28.08%, respectively, after adding 8 percent anhydrite.https://www.mdpi.com/1996-1944/16/16/5648repair mortarcalcium sulfateettringitecement |
| spellingShingle | Hao Ding Xuepeng Shen Aili Chen Rulin Gu Ying Fang Dongxu Li Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar Materials repair mortar calcium sulfate ettringite cement |
| title | Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar |
| title_full | Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar |
| title_fullStr | Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar |
| title_full_unstemmed | Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar |
| title_short | Study on the Effect of Three Types of Calcium Sulfate on the Early Hydration and Workability of Self-Compacting Repair Mortar |
| title_sort | study on the effect of three types of calcium sulfate on the early hydration and workability of self compacting repair mortar |
| topic | repair mortar calcium sulfate ettringite cement |
| url | https://www.mdpi.com/1996-1944/16/16/5648 |
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