The fast setting of calcium sulphoaluminate (CSA) cement-based systems is typically controlled using set-retarding admixtures, despite the notable efficiency of tartaric acid (TA) in adjusting CSA-based mixtures setting times, its use has only been marginally investigated, with an almost exclusive focus on the early age properties of TA manufactured mortars. This paper aims at evaluating the effect of the addition of tartaric-acid retarder on the hydration mechanism and physical properties of CSA-based mixtures from 4 h to 84 days. Macro- and microstructural properties were investigated using X-ray diffraction and differential thermal-thermogravimetric analyses, mercury intrusion porosimetry measurements, mechanical tests and analyses at fresh and hardened state. The experimental results reveal that the use of TA delays the formation of ettringite, modifies the porosity of hardened mixtures and strongly reduces strength in the short term. Nevertheless, the addition of TA slightly influences the properties at longer periods.

硫铝酸钙 (CSA) 水泥基体系的快速凝结通常使用缓凝外加剂进行控制，尽管酒石酸 (TA) 在调整 CSA 基混合物凝结时间方面具有显着效率，但其使用仅被少量研究，与几乎完全专注于 TA 制造的砂浆的早期特性。本文旨在评估添加酒石酸缓凝剂对 CSA 基混合物 4 h 至 84 天的水合机制和物理性质的影响。使用 X 射线衍射和差热-热重分析、压汞孔隙率测量、机械测试以及新鲜和硬化状态下的分析来研究宏观和微观结构特性。实验结果表明，TA 的使用延迟了钙矾石的形成，改变硬化混合物的孔隙率并在短期内强烈降低强度。然而，添加 TA 对较长时间的性能有轻微影响。