Abstract
This study presents an eco-efficient cement-limestone- calcined clay tailings ultra-high performance concrete (LC2 UHPC). On the basis of the D-optimal mixture design method, the LC2 UHPC recipes and fresh behaviors are firstly proposed and optimized. Then, the macro and micro characteristics of produced LC2 UHPC are evaluated. The obtained experimental results show that when the added total amount of limestone powder and calcined clay tailings reach 56.8% of the cementitious materials, the corrosion resistance properties of LC2 UHPC are optimized and advanced compared to normal UHPC. Afterwards, the microstructure and hydration properties of LC2 UHPC are presented. The ITZ of LC2 UHPC is denser than normal UHPC. Hydration degree of cement LC2 UHPC is higher. Moreover, the addition of limestone powder and calcined clay tailings can decrease the environmental impact by 37.1% compared to normal UHPC. The disadvantage of LC2 UHPC mainly is that the compressive strength and workability of LC2 UHPC is lower than normal UHPC. Considering the fact that the LC2 system is a low-carbon and more sustainable cementitious material than normal cement, the produced LC2 UHPC can be treated as an eco-friendly construction product, which is suitable to be wildly utilized to some area with plenty of clay sources in China in the future.
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