The implementation of extrusion-based 3D concrete printing (3DCP) in large-scale constructions is currently limited by concerns regarding rheology control and the sustainability of this process. To address these issues, this study presents an approach to develop limestone-calcined clay-based cementitious (LC3) materials accelerated by Ca(NO₃)₂ solution in an inline static mixer-based 3DCP setup. Using this approach, a printable mixture containing only about 275 kg/m³ of Portland cement was formulated that can exhibit a good buildability performance and a 28-day compressive strength of over 30 MPa. Additionally, the effects of adding Ca(NO₃)₂ solution on the initial setting time, structural build-up, inline buildability, early-age hydration, and compressive strength of LC3 materials were investigated and discussed. Results show that the addition of Ca(NO₃)₂ solution improved the buildability and accelerated initial setting as well as the structuration due to the promoted ettringite precipitation and C–S–H nucleation. Furthermore, compressive strength at 7 and 28 days was improved through increasing the Ca(NO₃)₂ dosage, which can be attributed to the formation of NO₃-AFm and the increase in the amount of C–S–H gels.

目前，由于流变控制和该过程的可持续性问题，基于挤出的 3D 混凝土打印 (3DCP) 在大型建筑中的实施受到限制。为了解决这些问题，本研究提出了一种在基于在线静态混合器的 3DCP 设置中开发由 Ca(NO ₃ ) ₂溶液加速的石灰石煅烧粘土基水泥 (LC3) 材料的方法。使用这种方法，配制出仅含有约275 kg/m ³波特兰水泥的可打印混合物，该混合物可以表现出良好的可施工性能和超过30 MPa的28天抗压强度。_{此外，还研究并讨论了添加Ca(NO 3} ) ₂溶液对LC3材料的初凝时间、结构形成、在线可施工性、早期水化和抗压强度的影响。结果表明，Ca(NO ₃ ) ₂溶液的添加改善了可施工性，并加速了初凝以及由于促进钙矾石沉淀和C –S–H 成核而导致的结构化。_{此外，通过增加Ca(NO 3} ) ₂剂量，第7天和第28天的抗压强度得到改善，这可归因于NO _{3 -AFm的形成和}C -S-H凝胶数量的增加。