Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste
Low-carbon ecological cement composites are among the most promising construction materials. With low energy consumption, low carbon dioxide emissions, and high early strength, sulfoaluminate cement (SAC) is a low-carbon ecological building material. In addition, graphene nanoplates (GNPs) exhibit e...
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| Format: | Article |
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MDPI AG
2022-08-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/15/2708 |
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| author | Kai Cui Jun Chang Mohanad Muayad Sabri Sabri Jiandong Huang |
| author_facet | Kai Cui Jun Chang Mohanad Muayad Sabri Sabri Jiandong Huang |
| author_sort | Kai Cui |
| collection | DOAJ |
| description | Low-carbon ecological cement composites are among the most promising construction materials. With low energy consumption, low carbon dioxide emissions, and high early strength, sulfoaluminate cement (SAC) is a low-carbon ecological building material. In addition, graphene nanoplates (GNPs) exhibit excellent performances. In this study, GNPs were dispersed by a combination of dispersant and ultrasonic treatment, and the dispersion effect of GNPs was characterized. The effect of GNPs on the hydration process and products of SAC was studied, revealing that GNPs accelerate SAC hydration. The hydration heat and ICP results showed that in the SAC hydrolysis stage, C<sub>4</sub>A<sub>3</sub>Š (ye’elimite) hydrolyzed and released Ca<sup>2+</sup>. GNPs absorbed the Ca<sup>2+</sup>, and the Ca<sup>2+</sup> concentration around C<sub>4</sub>A<sub>3</sub>Š decreased, which would promote the hydrolysis of C<sub>4</sub>A<sub>3</sub>Š and release more Ca<sup>2+</sup>, accelerating the hydration of SAC and the nucleation effect of GNPs, and providing sites for the formation of hydration products. The analysis of XRD (X-Ray Diffraction) and TGA (Thermal Gravity Analysis) showed that GNPs promoted the hydration of SAC and formed more AFt (ettringite) and AH<sub>3</sub> (gibbsite). The generated hydration products fill the pores of the matrix and are closely connected to the GNPs to form a whole, which improves the cement matrix’s mechanical properties. |
| first_indexed | 2024-03-09T12:18:43Z |
| format | Article |
| id | doaj.art-45b31535c08c40f1be3601cee9a93f86 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T12:18:43Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-45b31535c08c40f1be3601cee9a93f862023-11-30T22:43:13ZengMDPI AGNanomaterials2079-49912022-08-011215270810.3390/nano12152708Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement PasteKai Cui0Jun Chang1Mohanad Muayad Sabri Sabri2Jiandong Huang3School of Civil Engineering, Dalian University of Technology, Dalian 116024, ChinaSchool of Civil Engineering, Dalian University of Technology, Dalian 116024, ChinaPeter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, RussiaSchool of Civil Engineering, Guangzhou University, Guangzhou 510006, ChinaLow-carbon ecological cement composites are among the most promising construction materials. With low energy consumption, low carbon dioxide emissions, and high early strength, sulfoaluminate cement (SAC) is a low-carbon ecological building material. In addition, graphene nanoplates (GNPs) exhibit excellent performances. In this study, GNPs were dispersed by a combination of dispersant and ultrasonic treatment, and the dispersion effect of GNPs was characterized. The effect of GNPs on the hydration process and products of SAC was studied, revealing that GNPs accelerate SAC hydration. The hydration heat and ICP results showed that in the SAC hydrolysis stage, C<sub>4</sub>A<sub>3</sub>Š (ye’elimite) hydrolyzed and released Ca<sup>2+</sup>. GNPs absorbed the Ca<sup>2+</sup>, and the Ca<sup>2+</sup> concentration around C<sub>4</sub>A<sub>3</sub>Š decreased, which would promote the hydrolysis of C<sub>4</sub>A<sub>3</sub>Š and release more Ca<sup>2+</sup>, accelerating the hydration of SAC and the nucleation effect of GNPs, and providing sites for the formation of hydration products. The analysis of XRD (X-Ray Diffraction) and TGA (Thermal Gravity Analysis) showed that GNPs promoted the hydration of SAC and formed more AFt (ettringite) and AH<sub>3</sub> (gibbsite). The generated hydration products fill the pores of the matrix and are closely connected to the GNPs to form a whole, which improves the cement matrix’s mechanical properties.https://www.mdpi.com/2079-4991/12/15/2708sulfoalumintae cementdispersionmicrostructurehydration |
| spellingShingle | Kai Cui Jun Chang Mohanad Muayad Sabri Sabri Jiandong Huang Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste Nanomaterials sulfoalumintae cement dispersion microstructure hydration |
| title | Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste |
| title_full | Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste |
| title_fullStr | Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste |
| title_full_unstemmed | Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste |
| title_short | Study of Dispersion, Hydration, and Microstructure of Graphene Nanoplates-Modified Sulfoaluminate Cement Paste |
| title_sort | study of dispersion hydration and microstructure of graphene nanoplates modified sulfoaluminate cement paste |
| topic | sulfoalumintae cement dispersion microstructure hydration |
| url | https://www.mdpi.com/2079-4991/12/15/2708 |
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