Blast furnace slag cement can be classified into 3 types depending on the content of slag. In comparison to Portland cement, this slag cement retains less heat from hydration, higher durability and chemical resistance, and less permeability. It is mostly used in large-scale constructions including dams, sea banks, tunnels and subways. More recently, it was used as environment-friendly injection material for ground. Stabilization and land reclamation. It is also made into low-heat, low-shrinkage slag cement with thermal cracking and shrinkage-deterring properties as well as high-early-strength property of Portland cement and long-term strength of blast furnace slag cement.