Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete
In this work, manganese tailing sand concrete (MTSC) was prepared using manganese tailing sand (MTS) in replacement of river sand (RS) to alleviate the shortage of RS resources and achieve clean treatment and high-value resource utilization of manganese tailing stone. The effects of MTS content on t...
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| Language: | English |
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MDPI AG
2022-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/15/16/5583 |
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| author | Min Bai Guangcheng Long Fan Wang |
| author_facet | Min Bai Guangcheng Long Fan Wang |
| author_sort | Min Bai |
| collection | DOAJ |
| description | In this work, manganese tailing sand concrete (MTSC) was prepared using manganese tailing sand (MTS) in replacement of river sand (RS) to alleviate the shortage of RS resources and achieve clean treatment and high-value resource utilization of manganese tailing stone. The effects of MTS content on the slump, mechanical strength, air void characteristics, hydration products and micromorphology of MTSC were studied experimentally. The leaching risk of harmful substances in MTSC was also explored by testing the concentration of Mn<sup>2+</sup>. The results show that the utilization of MTS reduces the slump of MTSC to a certain extent. When the MTS content is lower than 40%, the gypsum introduced by MTS and C<sub>3</sub>A in cement undergoes a hydration reaction to form ettringite, which decreases the number of pores with a diameter less than 0.1 mm and promotes strength development in MTSC. Additionally, when the MTS content exceeds 40%, the large amount of gypsum reacts to form more ettringite. The expansive stress generated by the ettringite severely damages the pore structure, which is not conducive to the mechanical properties of MTSC. In addition, the leaching of hazardous substances in MTSC is insignificant, and the incorporation of cement can effectively reduce the risk of leaching hazardous substances in MTSC. In summary, it is completely feasible to use MTS to replace RS for concrete preparation when the substitution rate of MTS is less than 40%, with no risk of environmental pollution. The results and adaptation in the concrete industry can reduce the carbon footprint, which is in line with the current trend in civil and materials engineering. |
| first_indexed | 2024-03-09T04:09:24Z |
| format | Article |
| id | doaj.art-1ed6d5e48d7b49149ed7950a9fc2bf59 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T04:09:24Z |
| publishDate | 2022-08-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-1ed6d5e48d7b49149ed7950a9fc2bf592023-12-03T14:01:27ZengMDPI AGMaterials1996-19442022-08-011516558310.3390/ma15165583Properties and Microstructural Characteristics of Manganese Tailing Sand ConcreteMin Bai0Guangcheng Long1Fan Wang2School of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaSchool of Civil Engineering, Central South University, Changsha 410075, ChinaIn this work, manganese tailing sand concrete (MTSC) was prepared using manganese tailing sand (MTS) in replacement of river sand (RS) to alleviate the shortage of RS resources and achieve clean treatment and high-value resource utilization of manganese tailing stone. The effects of MTS content on the slump, mechanical strength, air void characteristics, hydration products and micromorphology of MTSC were studied experimentally. The leaching risk of harmful substances in MTSC was also explored by testing the concentration of Mn<sup>2+</sup>. The results show that the utilization of MTS reduces the slump of MTSC to a certain extent. When the MTS content is lower than 40%, the gypsum introduced by MTS and C<sub>3</sub>A in cement undergoes a hydration reaction to form ettringite, which decreases the number of pores with a diameter less than 0.1 mm and promotes strength development in MTSC. Additionally, when the MTS content exceeds 40%, the large amount of gypsum reacts to form more ettringite. The expansive stress generated by the ettringite severely damages the pore structure, which is not conducive to the mechanical properties of MTSC. In addition, the leaching of hazardous substances in MTSC is insignificant, and the incorporation of cement can effectively reduce the risk of leaching hazardous substances in MTSC. In summary, it is completely feasible to use MTS to replace RS for concrete preparation when the substitution rate of MTS is less than 40%, with no risk of environmental pollution. The results and adaptation in the concrete industry can reduce the carbon footprint, which is in line with the current trend in civil and materials engineering.https://www.mdpi.com/1996-1944/15/16/5583manganese tailing sandmanganese tailing sand concretemechanical propertiesair void characteristicsmicrostructureresource reuse |
| spellingShingle | Min Bai Guangcheng Long Fan Wang Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete Materials manganese tailing sand manganese tailing sand concrete mechanical properties air void characteristics microstructure resource reuse |
| title | Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete |
| title_full | Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete |
| title_fullStr | Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete |
| title_full_unstemmed | Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete |
| title_short | Properties and Microstructural Characteristics of Manganese Tailing Sand Concrete |
| title_sort | properties and microstructural characteristics of manganese tailing sand concrete |
| topic | manganese tailing sand manganese tailing sand concrete mechanical properties air void characteristics microstructure resource reuse |
| url | https://www.mdpi.com/1996-1944/15/16/5583 |
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