Commonly used garden decoration materials which
According to the purpose and performance is divided into three categories: ① general cement. For general civil engineering, such as Portland cement (calcium silicate as the main mineral composition of the cement collectively, the international collectively referred to as Portland cement, including ordinary Portland cement, slag, volcanic ash, fly ash , Mixed portland cement, etc.). ② special cement. For a special project, such as oil well cement, sand and other cement
③ special cement. For some properties of concrete have special requirements of the project, such as fast hard cement, hydraulic cement, sulfate cement, expansion cement, self-stress cement. The performance of cement must meet the requirements of national standards such as fineness, setting time, stability, strength, specific gravity, hydration heat, impermeability, frost resistance, shrinkage, heat resistance and corrosion resistance and other indicators.
Cement production and composition is more complex:
Cement made of powdered hydraulic inorganic cementitious material. Add water into the slurry after mixing, in the air or water hardening, and can sand, stone and other materials firmly cemented together. Cement is an important building materials, made of cement mortar or concrete, durable and durable, widely used in civil engineering, water conservancy, defense and other projects. The production process of cement, limestone and clay as the main raw material, the broken, ingredients, grinding made of raw materials, feed into the cement kiln calcined mature material, add the appropriate amount of gypsum (sometimes mixed with mixed materials or admixture) grinding Come into being.
