Abstract
In this research, iron ore tailing (IOT) is utilized as the cementitious material to develop an eco-friendly ultra-high performance concrete (UHPC). The UHPC mix is obtained according to the modified Andreasen and Andersen (MAA) packing model, and the applied dosage of IOT is 10%, 20%, and 30% (by weight), respectively. The calculated packing density of different mixtures is consistent with each other. Afterwards, the fresh and hardened performance of UHPC mixtures with IOT are evaluated. The results demonstrate that the workability of designed UHPC mixtures is increased with the incorporation of IOT. The heat flow at an early age of designed UHPC with IOT is attenuated, the compressive strength and auto shrinkage at an early age are consequently reduced. The addition of IOT promotes the development of long-term compressive strength and optimization of the pore structure, thus the durability of designed UHPC is still guaranteed. In addition, the ecological estimate results show that the utilization of IOT for the UHPC design can reduce the carbon emission significantly.
Highlights
Ultra-high performance concrete (UHPC) is a newly developed construction material, which is characterized by superior properties [1,2,3]
The results show that the workability of designed ultra-high performance concrete (UHPC) is improved with the incorporation of iron ore tailing (IOT)
The results can be clarified as follows: The particles of the adopted IOT are larger than the cement, which correspond to the smaller specific surface area and lower water requirement
Summary
Ultra-high performance concrete (UHPC) is a newly developed construction material, which is characterized by superior properties [1,2,3]. Owing to its remarkable performances, the service life could be prolonged and the relieve maintenance costs must be reduced significantly when UHPC is utilized in the construction of concrete structure and engineering [4]. The research and application in engineering of UHPC is becoming more and more extensive. UHPC is still treated as a kind of building material which does not conform to the concept of sustainable development [9,10]. It is logic to utilize some inactive fillers to partly replace the cement, which will reduce the environment burden and widen the application of UHPC [13]
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