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| Influence of Activator on Properties of Red Mud-Gold Tailings-Alkali Slag System |
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Received:April 16, 2022
Revised:April 24, 2022
Accepted:April 26, 2022
Published Online:August 11, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.09.021 |
| KeyWord:red mud; gold tailings; alkali excitation; mechanical properties; microscopic analysis |
| Author | Institution |
| CUI Hao-nan |
北方工业大学 土木工程学院 |
| CHENG Hai-li |
北方工业大学 土木工程学院 |
| HUANG Tian-yong |
北京建筑材料科学研究总院有限公司 固废资源化利用于节能建材国家重点实验室 |
| YANG Fei-hua |
北京建筑材料科学研究总院有限公司 固废资源化利用于节能建材国家重点实验室 |
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| Abstract: |
| In order to improve the combined utilization of hazardous solid waste, red mud-gold tailings-slag based alkali-activated cementitious materials were prepared with red mud, gold tailings and slag from Bayer process as active materials and NaOH, KOH and Na2SiO3 as activators respectively. Its mechanical properties were tested, and microscopic mechanism was characterized by XRD, FT-IR, TGA/DSC and SEM. The experimental results show that different kinds of activators had great influence on mechanical properties of the system. When Na2SiO3 is used as activator, the excitation effect of the system is the best, and the flexural strength and compressive strength of the standard mortar specimen at 3 days are 5.5 MPa and 23.5 MPa respectively. The flexural strength and compressive strength of 28 d standard mortar specimens are 8.8 MPa and 43.21MPa respectively, which can reach the cement strength index of P?I42.5. Through microscopic analysis, it is known that main strength sources of specimens are ettringite and hydrated calcium aluminosilicate gel, and the materials with high mechanical properties have more dense microstructure and more alkali-stimulated hydration products. |
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