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| Preparation and Properties of the Concrete Made by Barren Rocks and Iron Tailings as Aggregates |
| LIU Jia NI Wen** YU Miao |
| (State Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China), University of Science and Technology Beijing, Beijing 100083) |
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Cite this article:
LIU Jia NI Wen** YU Miao. Preparation and Properties of the Concrete Made by Barren Rocks and Iron Tailings as Aggregates. Chinese Journal of Materials Research, 2013, 27(6): 615-621.
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Abstract A kind of high volume fly ash concrete was prepared by using fly ash, barren rocks and iron tailings as the main materials. This high-strength concrete which was made by using barren rocks and iron tailings as aggregates contained ninety percent industrial solid wastes, its compressive strength under standard curving conditions was up to 83.27 MPa at the 28 days curving ages. Effects of fly ash on the working performance, mechanical performance and hydration process of the cementitious materials were investigated. The hydration properties and microstructure characteristics were analyzed by the XRD, TG-DSC and SEM. The results show that the fly ash can reduce the water consumption, slow down the hydration process and improve the mechanical properties of the cementitious materials. And the fly ash can consume the calcium hydroxide which was produced during the early hydration process, motivate the secondary hydration process, so as to ensure steady increase of the long-term strength.
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| Fund: Supported by National High Technology Research and Development Program of China No.2012AA062405. |
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