Sulfoaluminate cement (SAC) was considered as an eco-friendly material due to its less carbon emissions during its production. To date, no studies have been done to analyze fine SAC properties. If the carbon dioxide emissions can be controlled and fine SAC cement can be produced in a very short time by using a ball mill for 30 minutes then it will be a very economical and environmentally-friendly choice. Therefore, this research explores the influence of fine SAC at an average diameter of 2.5μm under partial replacement in conventional cement. The particle size was calculated by Malver master size 2000 analyzer according to ASTM E2651-10. The mortar compressive and flexural strength tests were performed according to ASTM C348-02 and ASTM C349-18 on conventional SAC and fine SAC partial replacement in conventional SAC. The weight losses and mass compositions were also analyzed with the help of thermogravimetric analysis (TGA) according to ASTM E1142-15. In addition, the accelerated carbonation for 2 hrs and also sulfate attack effects were also analysed. It is concluded from experiments that fine SAC partial replacement at 20% under conventional SAC results in effective structure.