Preparation of High–strength Concrete by Using Fly Ash and Iron Ore Tailings as Major Raw Materials

Chin J Mater Res

2012, Vol. 26

Issue (3): 295-301 DOI:

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Preparation of High–strength Concrete by Using Fly Ash and Iron Ore Tailings as Major Raw Materials

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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LIU Jia NI Wen YU Miao. Preparation of High–strength Concrete by Using Fly Ash and Iron Ore Tailings as Major Raw Materials. Chin J Mater Res, 2012, 26(3): 295-301.

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Abstract A high–strength concrete material was prepared by using fly ash and iron ore tailings as major raw materials. Reaction products and microstructure of hydrated harden samples of the high–strength concrete material were analyzed by XRD and SEM methods, and the influences of several factors, such as proportion of iron ore tailing, water–binder ratio and dosage of super plasticizer, on the mechanical properties of the high–strength concrete material were investigated. The results show that the prepared concrete material is composed of large ratio of solid waste up to 86.4% (mass fraction), and its compressive strength reached to 100.1 MPa with a flexural strength of 20.6 MPa. The early strength of the samples was developed by the formation of large amount of C–S–H gel and ettringite during the early hydration stage. The continued development of strength in the last stage was mainly caused by pozzolanic reactions of the waste materials which leaded consumption, reduction and disappearance of Ca(OH)₂ in the system.

Key words: inorganic non–metallic materials high–strength concrete material superplasticizer water–binder ratio

Received: 12 March 2012

ZTFLH:

TB321

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Supported by National High Technology Research and Development Program of China No.2012AA062405.

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https://www.cjmr.org/EN/ OR https://www.cjmr.org/EN/Y2012/V26/I3/295

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