Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid
An increasing amount of red mud (RM) is being generated globally due to the growth in aluminum production. To avoid RM pollution, low-cost methods for effectively recycling RM are being investigated. We propose a method for recycling RM as a construction material. Liquefied RM (LRM) was neutralized...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-05-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/10/2641 |
| _version_ | 1797533588749549568 |
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| author | Sukpyo Kang Hyeju Kang Byoungky Lee |
| author_facet | Sukpyo Kang Hyeju Kang Byoungky Lee |
| author_sort | Sukpyo Kang |
| collection | DOAJ |
| description | An increasing amount of red mud (RM) is being generated globally due to the growth in aluminum production. To avoid RM pollution, low-cost methods for effectively recycling RM are being investigated. We propose a method for recycling RM as a construction material. Liquefied RM (LRM) was neutralized by nitric acid and added to cement paste, and the hydration heat, compressive strength, and hydration products were investigated. The cement paste with neutralized LRM had a higher compressive strength than that of plain cement paste and cement paste with LRM without neutralization at 1 day of aging; this indicates that nitric acid neutralization increases the early-age strength. Furthermore, the cement paste with 10% neutralized LRM showed 28 days-compressive strength and hydration heating curves similar to the plain mixture, indicating the positive impact of LRM neutralization on the strength. It was noted that a greater quantity of portlandite was produced earlier in cement paste with neutralized LRM than in that without. Therefore, the proposed method of using RM as a concrete additive has the potential to reduce the cost and environmental impact of both construction materials and RM waste management. |
| first_indexed | 2024-03-10T11:17:42Z |
| format | Article |
| id | doaj.art-0623dd572b0b47b4b884cd72f14a65cf |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T11:17:42Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-0623dd572b0b47b4b884cd72f14a65cf2023-11-21T20:17:21ZengMDPI AGMaterials1996-19442021-05-011410264110.3390/ma14102641Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric AcidSukpyo Kang0Hyeju Kang1Byoungky Lee2Department of Architecture, Woosuk University, Jincheon 27841, KoreaDepartment of Construction Engineering, Woosuk University, Jincheon 27841, KoreaCOCHEMS Co., Ltd. Industrial Tools Circulating Center, 160, Daehwa-ro, Daedeok-gu, Daejeon 34368, KoreaAn increasing amount of red mud (RM) is being generated globally due to the growth in aluminum production. To avoid RM pollution, low-cost methods for effectively recycling RM are being investigated. We propose a method for recycling RM as a construction material. Liquefied RM (LRM) was neutralized by nitric acid and added to cement paste, and the hydration heat, compressive strength, and hydration products were investigated. The cement paste with neutralized LRM had a higher compressive strength than that of plain cement paste and cement paste with LRM without neutralization at 1 day of aging; this indicates that nitric acid neutralization increases the early-age strength. Furthermore, the cement paste with 10% neutralized LRM showed 28 days-compressive strength and hydration heating curves similar to the plain mixture, indicating the positive impact of LRM neutralization on the strength. It was noted that a greater quantity of portlandite was produced earlier in cement paste with neutralized LRM than in that without. Therefore, the proposed method of using RM as a concrete additive has the potential to reduce the cost and environmental impact of both construction materials and RM waste management.https://www.mdpi.com/1996-1944/14/10/2641red mudliquefied red mudred mud neutralizationcement pastecompressive strengthhydration heat |
| spellingShingle | Sukpyo Kang Hyeju Kang Byoungky Lee Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid Materials red mud liquefied red mud red mud neutralization cement paste compressive strength hydration heat |
| title | Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid |
| title_full | Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid |
| title_fullStr | Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid |
| title_full_unstemmed | Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid |
| title_short | Hydration Properties of Cement with Liquefied Red Mud Neutralized by Nitric Acid |
| title_sort | hydration properties of cement with liquefied red mud neutralized by nitric acid |
| topic | red mud liquefied red mud red mud neutralization cement paste compressive strength hydration heat |
| url | https://www.mdpi.com/1996-1944/14/10/2641 |
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