Cements are divided into three categories according to their uses and properties. 1. General Cement, Cement commonly used in civil engineering. General-purpose cement mainly refers to six categories of cement specified in gb175-1999, gb1344-1999, and gb12958-1999, namely, Portland cement, ordinary portland cement, slag portland cement, pozzolanic portland cement, and powder Coal ash portland cement and composite portland cement. 2, special cement, special purpose cement. Such as: g-grade oil well cement, road Portland cement. 3, characteristics of cement, a relatively prominent performance of the cement. Such as: quick-hardening Portland cement, low-heat slag portland cement, expanded sulphoaluminate cement. Cement is classified according to its main hydraulic material name (1) Portland cement, commonly known as Portland cement abroad; (2) Aluminate cement; (3) Sulphoaluminate cement; (4) Ferroaluminate cement; (5) Fluoroaluminate cement; (6) Cements based on volcanic ash or potentially hydraulic materials and other active materials. The main technical characteristics of cement as required in the designation of cement are divided into: (1) Fastness: divided into two categories: fast and fast; (2) Heat of hydration: divided into medium heat and low heat; (3) Sulfate resistance: divided into two categories: resistance to sulphate corrosion and high resistance to sulphate corrosion; (4) Swelling: Divided into two categories: swelling and self-stress; (5) High temperature resistance: The high temperature resistance of aluminate cement is classified based on alumina content in cement. Yellow Sand Cement Cement
Knowledge of building materials: the type of cement