Expansive characteristics of calcium sulfoaluminate-belite (CSAB) cement can be harnessed for making shrinkage-compensating concrete. The level of expansion is dependent on several factors, such as the amounts of ye'elimite and calcium sulfate available in CSAB cement. Moreover, calcium sulfate from an external source can also influence the expansion characteristics by increasing the supersaturation with respect to ettringite. In this study, the influence of externally available calcium sulfate was investigated by curing a blend of Portland cement (PC) and CSAB cement to different concentrations (1 g/l and 5 g/l) of gypsum solutions. Expansion of the PC-CSAB blended cement was found to be directly affected by the ye'elimite content (CSAB dosage) and the gypsum concentration in exposure solution. The presence of external calcium sulfate during the hydration of ye'elimite was found to affect the hydrate phase assemblage, the pore structure, and the morphology of ettringite. Furthermore, the level of expansion depended on the age at which the specimens were exposed to the gypsum solution, indicating the influence of matrix stiffness on resultant expansion.

可以利用硫铝酸钙-贝利特钙（CSAB）水泥的膨胀特性来制造可补偿收缩的混凝土。膨胀水平取决于几个因素，例如CSAB水泥中的叶e和硫酸钙的量。此外，来自外部来源的硫酸钙还可通过增加相对于钙矾石的过饱和度而影响膨胀特性。在这项研究中，通过将波特兰水泥（PC）和CSAB水泥的混合物固化到不同浓度（1 g / l和5 g / l）的石膏溶液中，研究了外部可用的硫酸钙的影响。发现PC-CSAB掺合水泥的膨胀直接受到极限含量（CSAB用量）和暴露溶液中石膏浓度的影响。发现在e石水合过程中存在外部硫酸钙会影响水合物相的组装，孔结构和钙矾石的形貌。此外，膨胀水平取决于样品暴露于石膏溶液的年龄，表明基质刚度对所得膨胀的影响。