Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs
The utilization of coral waste is an economical way of using concrete in coastal and offshore constructions. Coral waste with more than 96% CaCO<sub>3</sub> can be ground to fines and combined with supplementary cementitious materials (SCMs) such as fly ash, silica fume, granulated blast...
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| Format: | Article |
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MDPI AG
2020-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/19/4248 |
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| author | Xingxing Li Ying Ma Xiaodong Shen Ya Zhong Yuwei Li |
| author_facet | Xingxing Li Ying Ma Xiaodong Shen Ya Zhong Yuwei Li |
| author_sort | Xingxing Li |
| collection | DOAJ |
| description | The utilization of coral waste is an economical way of using concrete in coastal and offshore constructions. Coral waste with more than 96% CaCO<sub>3</sub> can be ground to fines and combined with supplementary cementitious materials (SCMs) such as fly ash, silica fume, granulated blast furnace slag in replacing Portland cement to promote the properties of cement concrete. The effects of coral sand powder (CSP) compared to limestone powder (LSP) blended with SCMs on hydration and microstructure of mortar were investigated. The result shows CSP has higher activity than LSP when participating in the chemical reaction. The chemical effect among CSP, SCMs, and ordinary Portland cement (OPC) results in the appearance of the third hydration peak, facilitating the production of carboaluminate. CSP-SCMs mortar has smaller interconnected pores on account of the porous character of CSP as well as the filler and chemical effect. The dilution effect of CSP leads to the reduction of compressive strength of OPC-CSP and OPC-CSP-SCMs mortars. The synergic effects of CSP with slag and silica fume facilitate the development of compressive strength and lead to a compacted isolation and transfer zone (ITZ) in mortar. |
| first_indexed | 2024-03-10T16:06:00Z |
| format | Article |
| id | doaj.art-c9277769a0794deba434ec19886e32d0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T16:06:00Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-c9277769a0794deba434ec19886e32d02023-11-20T14:53:13ZengMDPI AGMaterials1996-19442020-09-011319424810.3390/ma13194248Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMsXingxing Li0Ying Ma1Xiaodong Shen2Ya Zhong3Yuwei Li4College of Materials Science and Engineering, Nanjing Tech University, Nanjing 210000, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210000, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210000, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210000, ChinaCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 210000, ChinaThe utilization of coral waste is an economical way of using concrete in coastal and offshore constructions. Coral waste with more than 96% CaCO<sub>3</sub> can be ground to fines and combined with supplementary cementitious materials (SCMs) such as fly ash, silica fume, granulated blast furnace slag in replacing Portland cement to promote the properties of cement concrete. The effects of coral sand powder (CSP) compared to limestone powder (LSP) blended with SCMs on hydration and microstructure of mortar were investigated. The result shows CSP has higher activity than LSP when participating in the chemical reaction. The chemical effect among CSP, SCMs, and ordinary Portland cement (OPC) results in the appearance of the third hydration peak, facilitating the production of carboaluminate. CSP-SCMs mortar has smaller interconnected pores on account of the porous character of CSP as well as the filler and chemical effect. The dilution effect of CSP leads to the reduction of compressive strength of OPC-CSP and OPC-CSP-SCMs mortars. The synergic effects of CSP with slag and silica fume facilitate the development of compressive strength and lead to a compacted isolation and transfer zone (ITZ) in mortar.https://www.mdpi.com/1996-1944/13/19/4248coral sand powderSCMshydrationporositymicrostructure |
| spellingShingle | Xingxing Li Ying Ma Xiaodong Shen Ya Zhong Yuwei Li Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs Materials coral sand powder SCMs hydration porosity microstructure |
| title | Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs |
| title_full | Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs |
| title_fullStr | Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs |
| title_full_unstemmed | Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs |
| title_short | Study of Hydration and Microstructure of Mortar Containing Coral Sand Powder Blended with SCMs |
| title_sort | study of hydration and microstructure of mortar containing coral sand powder blended with scms |
| topic | coral sand powder SCMs hydration porosity microstructure |
| url | https://www.mdpi.com/1996-1944/13/19/4248 |
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