Duke Zhou dreamed of cement?

Cement is a mixture of water and mud in a certain proportion. Cement is a hydraulic inorganic cementing material, which contains lime and gypsum. The main mineral components of cement are limestone, clay, alumina, iron, calcium and magnesium. Cement consists of hydraulic materials and cementitious materials, and cement is the main component of cement stone. Cement is made by mixing limestone and clay, crushing, proportioning and grinding into raw materials, sending them into cement kiln to calcine mature materials, and adding appropriate amount of gypsum powder for grinding.