Design and performance study of red mud-based ultra-high performance concrete
In order to reduce the energy consumption of ultra-high performance concrete(UHPC),this study explores the feasibility of using red mud as the mineral admixture to re-place cement and prepare a low-carbon ultra-high performance concrete(LCUHPC).Based on the theory of the closest packing of particles,the study designs a red mud-based UHPC by using the Modified Andreasen&Andersen model,and systematically characterizes its working performance,mechanical properties and durability.The test results show that the addition of red mud reduces the working performance,the early(7 d)compressive strength and the durability of UHPC.The 28 d compressive strength of UHPC modified by high vol-ume(30%)red mud is greater than 100 MPa and the electric flux is less than 100 C,which verifies the feasibility of preparing LCUHPC with red mud.In addition,the leaching results of harmful components show that UHPC can effectively consolidate heavy metal ions in red mud and reduce the risk of high alkali leaching of red mud.
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