A study of metakaolin and limestone powder on sulfate resistance of cement-based materials was carried out by compressive strength changes, sulfate attack experiment as well as the microstructure development using X-ray diffraction (XRD), thermogravimetric analysis (TG/DTG), and ²⁷Al magic-angle spinning nuclear magnetic resonance (²⁷Al MAS NMR) techniques. It was found that metakaolin with 10% was optimum for compressive strength increase of mortars. While a dosage of 20% is required for improving sulfate resistance through significant consumption of calcium hydroxide, induction of Al into C-(A)-S-H rather than ettringite and the increase of mean chain length (MCL) of C-S-H. Limestone powder displayed certain chemical reactivity to promote the formation of thermostable product monocarboaluminate for the suppression of sulfate attack at some extent, while hybrids of metakaolin and limestone powder showed a negative sulfate resistance owing to the insufficient dosages of metakaolin within 5–10%. This study provided a constructive perspective on the using of metakaolin and limestone powder to improve sulfate resistance of cement-based materials.

通过抗压强度的变化，硫酸盐侵蚀实验以及X射线衍射（XRD），热重分析（TG / DTG）的微观结构研究，对偏高岭土和石灰石粉对水泥基材料的抗硫酸盐性进行了研究。²⁷ Al魔角旋转核磁共振（²⁷Al MAS NMR）技术。已发现10％的偏高岭土最适合提高砂浆的抗压强度。虽然需要通过大量消耗氢氧化钙来提高抗硫酸盐性的剂量为20％，但还是需要将Al诱导成C-（A）-SH而不是钙矾石，并增加CSH的平均链长（MCL）。石灰石粉显示出一定的化学反应性，可在一定程度上促进热稳定产物一碳铝酸盐的形成，从而抑制硫酸盐的侵蚀，而偏高岭土和石灰石粉的混合物由于偏高岭土的用量不足5-10％而显示出负的耐硫酸盐性。这项研究为使用偏高岭土和石灰石粉改善水泥基材料的抗硫酸盐性提供了建设性的见解。