Increasing the gypsum and slag contents in the blended cements containing slag is conducive to promote its green degree. The blended cement was prepared by mixing slag, gypsum and Portland clinker. Contour maps were designed to determine the optimal proportion of slag, gypsum and clinker by comprehensive considerations of strength, expansion, hydration, microstructure and crystallization stress. The strength contour map shows that there are two separate regions with high cement strength in the ternary slag-gypsum-clinker system; and the expansion deformation of these two regions are relatively low. The Rietveld XRD and pore solution analysis reveal that the occurrence of the destructive expansion results from the high crystallization stress of ettringite. It is illustrated that the gypsum content could be increased up to 25% when the clinker content is less than 5%, while the gypsum content should be limited below about 10% when the clinker content is more than 20%. The [CaO][SO₃]/[Al₂O₃] molar ratio is suggested to direct the optimization of the slag, gypsum and clinker in blended cement. As long as the [CaO][SO₃]/[Al₂O₃] ratio is not up to 1.5, more gypsum and slag could be added into the blended cement to obtain relatively excellent performance.

增加含矿渣掺合水泥中的石膏和矿渣含量有利于提高其生坯度。通过混合矿渣，石膏和波特兰熟料来制备掺合水泥。通过综合考虑强度，膨胀，水化，微观结构和结晶应力，设计出轮廓图来确定炉渣，石膏和熟料的最佳比例。强度等值线图表明，三元矿渣-石膏-熟料系统中有两个水泥强度高的独立区域；并且这两个区域的膨胀变形相对较低。Rietveld XRD和孔隙溶液分析表明，破坏性膨胀的发生是由于钙矾石的高结晶应力造成的。说明了当熟料含量小于5％时，石膏含量可增加至25％，而当熟料含量大于20％时，石膏含量应限制在约10％以下。[CaO] [SO_{建议使用3} ] / [Al ₂ O ₃ ]摩尔比来指导混合水泥中矿渣，石膏和熟料的优化。只要[CaO] [SO ₃ ] / [Al ₂ O ₃ ]之比不大于1.5，就可以向混合水泥中添加更多的石膏和矿渣以获得相对优异的性能。