Q: What is the cementing material? And what types?

A: Cementing materials are generally divided into two categories, inorganic and organic cementing materials. The cementing material generally used in buildings refers to the inorganic cementing material. It refers to such a category of inorganic powder material as is mixed with water or the aqueous solution to form the slurry, which can gradually get hardened to form the artificial stone with strength after a series of physical and chemical effects.

Inorganic cementing materials are generally divided into two categories, hydraulic and air-hardening cementing materials. Cementing materials can only be hardened in the air and cannot be hardened in the water, such as lime, gypsum and magnesia cementing materials, etc. Such a category of materials are generally only applicable to the ground or dry environment, but unsuitable for the humid environment, let alone in the water. Hydraulic cementing materials can be hardened both in the air and in the water. Such a category of materials are often referred to as cement, such as Portland cement, aluminate cement and sulphoaluminate cement, etc.

The cement used for concrete, such as Portland cement, ordinary Portland cement, and slag cement, can all be used for mortar. For some dry-mixed mortar, such as self-leveling mortar, grouting mortar, fast-repair mortar and plugging agents, due to the requirement for the characteristics of early strength and fast hardening, the aluminate cement, sulphoaluminate cement and ferrous aluminate cement are often used.