The use of cement and the development history of cement???

Cement has a gelling effect in concrete. Definition of concrete: Concrete is a composite material formed by combining water with inorganic cementing materials such as cement, lime, gypsum, etc., or the colloidal matter of organic cementing materials such as asphalt and resin is matched and stirred with aggregates in a certain proportion, and cured and hardened at a certain temperature.

The quality of cement slurry plays a decisive role in the performance of concrete, but since the aggregate occupies most of the volume in the concrete, the quality of the aggregate also has a great influence on the performance of the cement concrete.

Cement can harden in air or water, and firmly cement sand, stone and other materials together to achieve the purpose of stabilizing the building. As an important cementitious material, cement is widely used in civil construction, water conservancy, national defense and other fields. The naming of cement is carried out according to different categories based on the main hydraulic minerals, mixed materials, uses and main characteristics of cement, and strives to be concise and accurate.

Cement can harden in air or water, and firmly cement sand, stone and other materials together to achieve the purpose of stabilizing the building. As an important cementitious material, cement is widely used in civil construction, water conservancy, national defense and other fields. The naming of cement is carried out according to different categories based on the main hydraulic minerals, mixed materials, uses and main characteristics of cement, and strives to be concise and accurate.

Cement has been produced in the history of our country since 1906.

In 1889, near the Kaiping Coal Mine in Tangshan, Hebei Province, China, a Tangshan "Fine Cotton" Plant was set up to produce with vertical kilns.

In 1906, on the basis of the plant, Qixin Ash Company was established, with an annual output of 40,000 tons of cement.

In 1952, China formulated the first national unified standard, which determined that cement production should be based on the principle of multiple varieties and multiple labels, and renamed Portland cement according to the main mineral composition it contained, and later changed to Portland cement.

In 2012, China's cement output reached 100 million tons, accounting for more than 50% of the world's output.

The future development trend of the cement industry: strengthen market research and analysis, improve technology and chain organization, and strive to develop overseas markets.

Cement, powdered hydraulic inorganic cementitious material. After adding water and stirring, it forms a slurry, which can be hardened in air or water, and can firmly cement sand, stone and other materials together.

Judging from the market pull of China's cement industry in recent years, the real estate industry is undoubtedly the most important demand. In 2020, China's cement market will be stable.

Once this work is completed, the demand for real estate development and infrastructure construction related to it is bound to be greatly reduced, and the demand for cement will also be reduced.

In this case, the shrinkage of the domestic market will inevitably cause changes in supply and demand, cement enterprises want to get out of the predicament, they must expand the space in the international market, and this requires enterprises to comprehensively improve in terms of technology and management.

First, the output. 2. Cement import and export.

3. Cement market**.

(1) According to the main hydraulic substance of cement: Portland cement (the main hydraulic substance is calcium silicate), aluminate cement (the main hydraulic substance is calcium aluminate), sulfoaluminate cement (the main hydraulic substance is calcium sulfoaluminate), etc. Because their hydraulics are different, their properties are also different, such as aluminate cement sets quickly.

Early high strength, good heat resistance and resistance to sulfate corrosion;After hardening, sulfoaluminate cement will expand in volume, etc.

2) according to the use of cement is divided into: general cement (used for general construction projects, mainly five kinds of cement of Portland), special cement (refers to the mud suitable for special purposes, there are dam cement, oil well cement, masonry cement, etc.) special cement (cement with a more prominent certain properties, such as expansion cement, low-heat cement, colored cement, white cement, etc.).

Uses It is widely used in civil and industrial construction projects, such as cementing in oil and gas fields, large-volume dams in water conservancy projects, military emergency repair projects, and can also be used for acid resistance, C2AS is not hydraulic in the crystalline state.

Why do you use cement to make a house?

You don't need cement to make a house, children play house.