Calcium Sulfoaluminate Cements (CSA) are considered as an alternative to Ordinary Portland Cement (OPC) for some applications. There is still a lack of knowledge on their durability and degradation mechanisms. The goal of this study is to investigate the influence of CSA cement composition on CSA cement paste durability. In addition to a commercial cement, two CSA cements with different amounts of ye’elimite (50 and 75 w.t. %) were synthetized for this study Three cement pastes were prepared and leached for one year in pure water at a temperature of 20 °C. The leachates were analyzed by ICP/AES and the cement pastes were characterized by X-Ray Diffraction (XRD), thermogravimetric analysis (TGA/DTG), Mercury Intrusion Porosimetry (MIP), and Scanning Electron Microscope (SEM). The results show that the leaching mechanism is first dissolutive than diffusive independently of the composition of calcium sulfoaluminate cement. Before leaching, the paste generated by the cement containing 50 w.t. % of ye’elimite had the highest porosity and was the only one to contain Stratlingite. During leaching, this material exhibited the lowest decalcification rate and showed the smallest degraded zone after one year of degradation. This study reveals that the presence of stratlingite has an important role in improving the durability of calcium sulfoaluminate cement paste.

对于某些应用，硫铝酸钙水泥 (CSA) 被认为是普通硅酸盐水泥 (OPC) 的替代品。仍然缺乏关于它们的耐久性和降解机制的知识。本研究的目的是研究 CSA 水泥成分对 CSA 水泥浆耐久性的影响。除了商业水泥之外，本研究还合成了两种含有不同量 ye'elimite（50 和 75 重量%）的 CSA 水泥。制备了三种水泥浆，并在 20 °C 的纯水中浸出一年。渗滤液采用 ICP/AES 分析，水泥浆采用 X 射线衍射 (XRD)、热重分析 (TGA/DTG)、压汞法 (MIP) 和扫描电子显微镜 (SEM) 进行表征。结果表明，与硫铝酸钙水泥的组成无关，浸出机制首先是溶解性而不是扩散性。在浸出之前，由含有 50 wt% ye'elimite 的水泥产生的浆体具有最高的孔隙率，并且是唯一一种含有 Stratlingite 的浆体。在浸出过程中，这种材料表现出最低的脱钙率，并在降解一年后显示出最小的降解区。本研究表明，Stratlingite 的存在对提高硫铝酸钙水泥浆体的耐久性具有重要作用。这种材料的脱钙率最低，降解一年后降解区最小。本研究表明，Stratlingite 的存在对提高硫铝酸钙水泥浆体的耐久性具有重要作用。这种材料的脱钙率最低，降解一年后降解区最小。本研究表明，Stratlingite 的存在对提高硫铝酸钙水泥浆体的耐久性具有重要作用。