Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix
In 2021, the price of silica fume had fallen to 400 RMB/ton in some areas, while that of cement had risen to 650 RMB/ton, which provided a realistic basis for applying silica fume in low- and medium-strength concrete. In this paper, the effects of adding a small amount of silica fume on the water de...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-06-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509522001218 |
| _version_ | 1818549139469762560 |
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| author | Xiaodong Ma Tingshu He Yongdong Xu Renhe Yang Yuhao Sun |
| author_facet | Xiaodong Ma Tingshu He Yongdong Xu Renhe Yang Yuhao Sun |
| author_sort | Xiaodong Ma |
| collection | DOAJ |
| description | In 2021, the price of silica fume had fallen to 400 RMB/ton in some areas, while that of cement had risen to 650 RMB/ton, which provided a realistic basis for applying silica fume in low- and medium-strength concrete. In this paper, the effects of adding a small amount of silica fume on the water demand, setting time, exothermic heat of hydration, fluidity, mechanical properties, and water absorption of mortar with 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0% of silica fume were investigated respectively. XRD and TG-DTG were used for microscopic analysis. The results showed that silica fume improved the fluidity of the cement fly ash system and reduced the water demand of the cement fly ash system, and that the water demand of the paste was reduced by about 4.5%. Therefore, water or superplasticizers could be reduced while maintaining the same fluidity. The exotherm peak during the hydration reaction are reduced. The silica fume improved the later strength of the specimen, accompanied by a slight decrease in the early strength. The water absorption was significantly reduced. Silica fume consumed CH in the cement-fly ash system and promoted the production of C-S-H. Therefore, the cost of cement consumption and improve performance could be lowered by replacing cement with silica fume. |
| first_indexed | 2024-12-12T08:29:31Z |
| format | Article |
| id | doaj.art-5fcf71cdd22843c9a080cd8e8d984044 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-12-12T08:29:31Z |
| publishDate | 2022-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-5fcf71cdd22843c9a080cd8e8d9840442022-12-22T00:31:09ZengElsevierCase Studies in Construction Materials2214-50952022-06-0116e00989Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrixXiaodong Ma0Tingshu He1Yongdong Xu2Renhe Yang3Yuhao Sun4Corresponding authors.; College of Materials Science and Engineering, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, ChinaCorresponding authors.; College of Materials Science and Engineering, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture & Technology, Xi’an, Shaanxi 710055, ChinaIn 2021, the price of silica fume had fallen to 400 RMB/ton in some areas, while that of cement had risen to 650 RMB/ton, which provided a realistic basis for applying silica fume in low- and medium-strength concrete. In this paper, the effects of adding a small amount of silica fume on the water demand, setting time, exothermic heat of hydration, fluidity, mechanical properties, and water absorption of mortar with 0.5%, 1.0%, 1.5%, 2.0%, 2.5% and 3.0% of silica fume were investigated respectively. XRD and TG-DTG were used for microscopic analysis. The results showed that silica fume improved the fluidity of the cement fly ash system and reduced the water demand of the cement fly ash system, and that the water demand of the paste was reduced by about 4.5%. Therefore, water or superplasticizers could be reduced while maintaining the same fluidity. The exotherm peak during the hydration reaction are reduced. The silica fume improved the later strength of the specimen, accompanied by a slight decrease in the early strength. The water absorption was significantly reduced. Silica fume consumed CH in the cement-fly ash system and promoted the production of C-S-H. Therefore, the cost of cement consumption and improve performance could be lowered by replacing cement with silica fume.http://www.sciencedirect.com/science/article/pii/S2214509522001218Silica fumeWater reductionMechanical propertiesFluidity |
| spellingShingle | Xiaodong Ma Tingshu He Yongdong Xu Renhe Yang Yuhao Sun Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix Case Studies in Construction Materials Silica fume Water reduction Mechanical properties Fluidity |
| title | Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix |
| title_full | Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix |
| title_fullStr | Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix |
| title_full_unstemmed | Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix |
| title_short | Hydration reaction and compressive strength of small amount of silica fume on cement-fly ash matrix |
| title_sort | hydration reaction and compressive strength of small amount of silica fume on cement fly ash matrix |
| topic | Silica fume Water reduction Mechanical properties Fluidity |
| url | http://www.sciencedirect.com/science/article/pii/S2214509522001218 |
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