| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Research on the Influence of High-carbon Ferrochromium Slag Aggregate on the Properties of Concrete Under the Same Gradation |
| HUANG Pengyu1, ZHOU Yongxiang2, LENG Faguang2,*, HE Yang2, KONG Yaning1, YANG Wen1, GAO Yuxin1
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1 China West Construction Academy of Building Materials, Chengdu 610213, China
2 China Academy of Building Research, Beijing 100013, China |
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Abstract High carbon ferrochromium slag is a kind of industrial smelting waste slag which is accumulated in large quantities and needs to be disposed of urgently. Using ferrochromium slag as aggregate to prepare green concrete is a promising approach to its consumption. In order to explore the influence of the material properties of ferrochromium slag on the performance of concrete, this study adjusts the aggregate gradation of ferrochromium slag to be consistent with natural sand and gravel, and studies the influence of ferrochromium slag aggregate on the flow performance, mechanical properties, chloride ion permeability resistance and microstructure of concrete. Meanwhile, based on different curing methods, the interfacial activity of ferrochromium slag was analyzed. The results show that the surface of ferrochromium slag is rough and has many open pores, under the same aggregate gradation, the replacement of natural aggregate by ferrochromium slag has an adverse effect on the flow properties of concrete mixtures, but it improves the compressive strength, the splitting tensile strength and the resistance to chloride ion permeability of concrete, and also have a certain improvement on the interface transition zone of concrete. In addition, ferrochromium slag has a certain improvement effect on the microstructure of the interface transition zone of concrete, and there are a small amount of low active substances on the surface of ferrochromium slag, which will participate in the reaction in the case of autoclave or later hydration.
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Published: 25 November 2024
Online: 2024-11-22
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| Fund:National Natural Science Foundation of China (52234004),Open Research Fund of Changjiang River Scientific Research Institute (CKMV2021878/KY),and the China State Construction Technology Research and Development Program (CSCEC-2022-Z-21). |
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2024, Vol. 38 
