Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite
In this work, magnesium oxychloride cement (MOC) was used to realize the resource use of foundry dust (FD). Portland cement (PC)-based superhydrophobic coating was prepared on the surface of FD/MOC composite to improve the water resistance of the composite. First, the FD/MOC composites with differen...
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MDPI AG
2020-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/13/15/3431 |
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| author | Fajun Wang Xiantao Zhu Huangjuan Liu Sheng Lei Daqi Huang |
| author_facet | Fajun Wang Xiantao Zhu Huangjuan Liu Sheng Lei Daqi Huang |
| author_sort | Fajun Wang |
| collection | DOAJ |
| description | In this work, magnesium oxychloride cement (MOC) was used to realize the resource use of foundry dust (FD). Portland cement (PC)-based superhydrophobic coating was prepared on the surface of FD/MOC composite to improve the water resistance of the composite. First, the FD/MOC composites with different contents of FD were prepared. The phase structure of the composite was analyzed using X-ray diffraction (XRD). The microstructure of the cross-section and surface of the composite was observed using field emission scanning electron microscope (FE-SEM). The mechanical properties of the FD/MOC composites with different FD contents at different ages were tested and analyzed. Secondly, the superhydrophobic coating was prepared on the surface of MOC composite using silane/siloxane aqueous emulsion as the hydrophobic modifier, PC as the matrix and water as the solvent. The microstructure and chemical composition of the PC-based superhydrophobic coating were tested and analyzed. The results show that FD can significantly improve the early strength of the FD/MOC composite. The 28-day compressive strength of the FD/MOC composite decreases with increasing FD content. When the FD content is 30%, the 28-day compressive strength of the FD/MOC composite is as high as 75.68 MPa. Superhydrophobic coating can effectively improve the water resistance of the FD/MOC composite. The softening coefficient of the FD/MOC composite without superhydrophobic coating is less than 0.26, while that of the composite modified by superhydrophobic coating is greater than 0.81. |
| first_indexed | 2024-03-10T17:59:21Z |
| format | Article |
| id | doaj.art-81d1afe16ee442b289b76d92f40e8382 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T17:59:21Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-81d1afe16ee442b289b76d92f40e83822023-11-20T09:00:31ZengMDPI AGMaterials1996-19442020-08-011315343110.3390/ma13153431Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement CompositeFajun Wang0Xiantao Zhu1Huangjuan Liu2Sheng Lei3Daqi Huang4School of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, ChinaSchool of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, ChinaSchool of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, ChinaSchool of Materials Engineering, Jiangsu University of Technology, Changzhou 213001, ChinaShiyan Litong New Materials Technology Co., LTD, Shiyan 442599, ChinaIn this work, magnesium oxychloride cement (MOC) was used to realize the resource use of foundry dust (FD). Portland cement (PC)-based superhydrophobic coating was prepared on the surface of FD/MOC composite to improve the water resistance of the composite. First, the FD/MOC composites with different contents of FD were prepared. The phase structure of the composite was analyzed using X-ray diffraction (XRD). The microstructure of the cross-section and surface of the composite was observed using field emission scanning electron microscope (FE-SEM). The mechanical properties of the FD/MOC composites with different FD contents at different ages were tested and analyzed. Secondly, the superhydrophobic coating was prepared on the surface of MOC composite using silane/siloxane aqueous emulsion as the hydrophobic modifier, PC as the matrix and water as the solvent. The microstructure and chemical composition of the PC-based superhydrophobic coating were tested and analyzed. The results show that FD can significantly improve the early strength of the FD/MOC composite. The 28-day compressive strength of the FD/MOC composite decreases with increasing FD content. When the FD content is 30%, the 28-day compressive strength of the FD/MOC composite is as high as 75.68 MPa. Superhydrophobic coating can effectively improve the water resistance of the FD/MOC composite. The softening coefficient of the FD/MOC composite without superhydrophobic coating is less than 0.26, while that of the composite modified by superhydrophobic coating is greater than 0.81.https://www.mdpi.com/1996-1944/13/15/3431foundry dustwaste recyclingmagnesium oxychloride cementsuperhydrophobic coatingwater resistance |
| spellingShingle | Fajun Wang Xiantao Zhu Huangjuan Liu Sheng Lei Daqi Huang Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite Materials foundry dust waste recycling magnesium oxychloride cement superhydrophobic coating water resistance |
| title | Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite |
| title_full | Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite |
| title_fullStr | Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite |
| title_full_unstemmed | Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite |
| title_short | Influence of Superhydrophobic Coating on the Water Resistance of Foundry Dust/Magnesium Oxychloride Cement Composite |
| title_sort | influence of superhydrophobic coating on the water resistance of foundry dust magnesium oxychloride cement composite |
| topic | foundry dust waste recycling magnesium oxychloride cement superhydrophobic coating water resistance |
| url | https://www.mdpi.com/1996-1944/13/15/3431 |
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