This study proposes an innovative approach to develop cementless ultra-high performance concrete (UHPC) by activating ground granulated blast furnace slag (GGBFS) without an alkaline-activating solution. To develop cementless UHPC, calcium oxide (CaO) (5% by weight) was used to activate GGBFS, and calcium formate (CF) was used as an accelerator at concentrations ranging from 0 to 6 wt%. The results showed that CF significantly improved the mechanical properties until 5 wt% and all the samples, including CF, exhibited a compressive strength of over 150 MPa. Uniaxial tensile tests revealed strain-hardening behavior, similar to typical cement-based UHPC. The addition of CF led to an increase in hydration products and pore size refinement, resulting in improved mechanical properties. The life cycle assessment results indicated that the developed UHPC mixture had nearly 70% lower CO₂ emission than cement-based UHPC. The experimental results highlight the potential of this method for sustainable UHPC development.

本研究提出了一种创新方法，通过在没有碱性活化溶液的情况下活化磨碎的粒化高炉矿渣 (GGBFS) 来开发非水泥超高性能混凝土 (UHPC) 。为了开发无水泥 UHPC，使用氧化钙 (CaO)（按重量计 5%）激活 GGBFS，并使用浓度范围为 0 到 6 wt% 的甲酸钙(CF) 作为促进剂。结果表明，CF 显着提高了机械性能，直至 5 wt%，并且包括 CF 在内的所有样品的抗压强度均超过 150 MPa。单轴拉伸试验揭示了应变硬化行为，类似于典型的水泥基 UHPC。CF 的添加导致水化产物的增加和孔径的细化，从而改善了机械性能。生命_{周期评估结果表明，开发的UHPC混合物的CO 2}排放量比水泥基UHPC低近70%实验结果突出了这种方法在可持续 UHPC 发展方面的潜力。