As a low-carbon cementitious material, the supersulfated cement (SSC) is composed of a thimbleful of cement clinkers and massive industry by-products, i. e: gypsum and slag. However, the concrete made from SSC suffers low strength, poor carbonation resistance, inferior frost resistance, etc. In such a scenario, two types of alkali activators (lactates and sodium hydroxyl) were employed to improve the microstructure and mitigate the performance of supersulfated cement concrete. The results indicate that the incorporation of lactates effectively improves mechanical performance, water impermeability, and carbonation resistance of supersulfated cement concrete. However, the addition of sodium hydroxide failed to result in a performance enhancement of SSC concrete. Furthermore, the mercury intrusion porosimetry (MIP), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM) were comprehensively utilized to illustrate the microstructure changes of supersulfated cement concrete. It indicates the hydration degree of supersulfated cement was promoted by the addition of lactates, which refined the pore structure of concrete. A more compact matrix conduces to overall performance enhancement. This work may shed new lights on the microstructure optimization of solid-waste-based binding materials and further promote the application of SSC concrete.

作为一种低碳水泥材料，超硫酸盐水泥（SSC）由少量的水泥熟料和大量的工业副产品组成。e：石膏和矿渣。然而，由SSC制成的混凝土强度低，抗碳化性差，抗冻性差等。在这种情况下，使用两种类型的碱活化剂（乳酸盐和羟基钠）改善了微结构并降低了超硫酸盐水泥的性能。具体。结果表明，乳酸盐的掺入有效地改善了超硫酸盐水泥混凝土的机械性能，防水性和抗碳化性。但是，添加氢氧化钠未能导致SSC混凝土的性能增强。此外，压汞法（MIP），X射线衍射（XRD），傅立叶变换红外光谱（FT-IR）和扫描电子显微镜（SEM）被综合用来说明过硫酸盐水泥混凝土的微观结构变化。这表明通过添加乳酸盐可以促进过硫酸盐水泥的水化程度，从而改善混凝土的孔结构。更紧凑的矩阵有助于提高整体性能。这项工作可能为固体废物基粘结材料的微观结构优化提供新的思路，并进一步促进SSC混凝土的应用。细化了混凝土的孔结构。更紧凑的矩阵有助于提高整体性能。这项工作可能为固体废物基粘结材料的微观结构优化提供新的思路，并进一步促进SSC混凝土的应用。细化了混凝土的孔结构。更紧凑的矩阵有助于提高整体性能。这项工作可能为固体废物基粘结材料的微观结构优化提供新的思路，并进一步促进SSC混凝土的应用。