Knowledge of building materials: the type of cement

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