This paper presents an efficient application for red mud, i.e., recycling red mud as a mineral additive in the development of ultra-high performance concrete (UHPC). Specifically, the modified Andreasen & Andersen particle packing model has been carried out to obtain a densely compacted UHPC matrix. After that, red mud is used to replace cement to reduce both the landfilling of red mud and the environmental burden of UHPC. Then, the fresh and hardened behavior of UHPC with and without red mud has been evaluated. It has been found that the addition of red mud enhanced early-age (7 d) durability due to the accelerated hydration process, while reduced the workability and the mechanical properties of UHPC. The degraded workability may affect the application in the building with complex shapes, but it can still be applied in general construction. An ultra-high strength (>150 MPa) of UHPC including 40% red mud can be generated after high-temperature curing, although the addition of red mud reduces the compressive strength. Besides, it is noteworthy that significantly shortened setting time can be obtained when replacing cement by red mud, providing ideas for the application in the UHPC rapid-repairing process. The pore structure analysis reveals a coarsening of micro-pore structure with an increase of red mud content. Finally, a low-energy consumption, as well as low radiation risk further promotes the environmental protection application of red mud based UHPC.

本文提出了赤泥的一种有效应用，即在开发超高性能混凝土（UHPC）中将赤泥作为矿物添加剂进行回收。具体而言，已进行了改进的Andreasen＆Andersen颗粒堆积模型，以获得致密的UHPC基质。之后，用赤泥代替水泥，既可以减少赤泥的填埋，又可以减少UHPC的环境负担。然后，评估了有或没有赤泥的UHPC的新鲜和硬化行为。已经发现，由于加速的水合过程，赤泥的添加增强了早期（7 d）的耐久性，同时降低了UHPC的可加工性和机械性能。降低的可使用性可能会影响形状复杂的建筑物中的应用，但仍可以在一般建筑中使用。尽管添加赤泥会降低抗压强度，但在高温固化后仍会产生包含40％赤泥的UHPC超高强度（> 150 MPa）。此外，值得注意的是，用赤泥代替水泥可以显着缩短凝结时间，为在UHPC快速修复过程中的应用提供了思路。孔隙结构分析显示，随着赤泥含量的增加，微孔结构变粗。最后，低能耗以及低辐射风险进一步促进了基于赤泥的UHPC的环保应用。值得注意的是，用红泥代替水泥可以大大缩短凝结时间，为在UHPC快速修复工艺中的应用提供了思路。孔隙结构分析显示，随着赤泥含量的增加，微孔结构变粗。最后，低能耗以及低辐射风险进一步促进了基于赤泥的UHPC的环保应用。值得注意的是，用赤泥代替水泥可以大大缩短凝结时间，为在UHPC快速修复过程中的应用提供了思路。孔隙结构分析显示，随着赤泥含量的增加，微孔结构变粗。最后，低能耗以及低辐射风险进一步促进了基于赤泥的UHPC的环保应用。