Cement characteristics

1. cement: powdery hydraulic inorganic cementing material. Mud can be hardened in air or water after being mixed with water, and can firmly bond sand, stone and other materials together. It takes advantage of the fact that some lime hardens in water.

2. The mixture of early lime and pozzolan is very similar to modern lime-pozzolan cement. The hardened concrete made of cemented macadam not only has high strength, but also can resist the erosion of fresh water or salt water. For a long time, as an important cementing material, it has been widely used in civil engineering, water conservancy, national defense and other projects.

Extended data:

1, classification:

(1) quick hardening (hydraulic): it can be divided into quick hardening and quick hardening;

(2) Hydration heat: divided into moderate heat and low heat;

(3) Sulfate resistance: divided into two categories: moderate sulfate resistance and high sulfate resistance;

(4) Expansibility: it can be divided into two categories: expansibility and self-stress;

(5) High temperature resistance: The high temperature resistance of aluminate cement is graded according to the content of alumina in cement.

2. Production process:

Cement production can be divided into dry method (including semi-dry method) and wet method (including semi-wet method) according to different preparation methods of raw materials.

Dry production: the new dry cement production line refers to the cement produced by the new process of decomposition outside the kiln. Its production takes suspension preheater and decomposition technology outside the kiln as the core, adopts new raw material and fuel homogenization and energy-saving grinding technology and equipment, and adopts computer distributed control throughout the line to realize automation, high efficiency, high quality, low consumption and environmental protection in the cement production process.

Wet production. A method of grinding raw materials into raw slurry with water and sending them into a wet kiln to calcine mature materials. Another method is to dehydrate the raw slurry prepared by wet method, make it into raw material blocks, and put it into a kiln for calcination, which is called semi-wet method and still belongs to one of wet production.

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