What types of cement can be divided into according to its use and performance?

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

The early lime-to-pozzolanic mixture is similar to modern lime pozzolana cement, cementing crushed concrete to harden and resist erosion from fresh or salt water. For a long time, as an important cementitious material, it has been widely used in civil construction, water conservancy, national defense and other projects. Cement: powdered hydraulic inorganic cementitious material.

After adding water and stirring into a slurry, it can be hardened in air or better hardened in water, and can firmly cement sand, stone and other materials together. The word cement is derived from the Latin word caementum, which means crushed stone and flake. The history of cement can be traced back to 5,000 years ago in China, where the Dadiwan people of Qin'an, China, laid a floor similar to modern cement.

Later ancient Romans used a mixture of lime and volcanic ash in their construction, which is similar to modern lime pozzolana cement. Concrete made from cemented crushed stone is not only strong after hardening, but also resistant to the erosion of fresh water or salt water. For a long time, as an important cementitious material, it has been widely used in civil construction, water conservancy, national defense and other projects.

1) White Portland cement: with calcium silicate as the main component, a small amount of iron clinker and an appropriate amount of colored Portland cement gypsum is ground finely.

2) Color Portland cement: It is made of white Portland cement clinker and high-quality white gypsum, mixed with pigments and admixtures. Commonly used color doping pigments include iron oxide (red, yellow, brown, black), manganese dioxide (brown, black), chromium oxide (green), cobalt blue (blue), ultramarine blue (indigo), peacock blue (sea blue), carbon black (black), etc.

Decorative cement is similar to Portland cement, the construction and maintenance are the same, but it is easier to pollute, and the equipment and tools must be clean.

1) General cement: cement usually used in general civil engineering and construction projects. General cement mainly refers to:

The six categories of cement specified in GB175-2007 are Portland cement, ordinary Portland cement, slag Portland cement, porosyl Portland cement, fly ash Portland cement and composite Portland cement.

2) Special cement: cement for special purposes. Such as: G-grade oil well cement, road Portland cement.

3) Characteristic cement: a certain cement with outstanding performance. Such as:

Fast hardening Portland cement, low-heat slag Portland cement, expanded sulphuraluminate cement, phosphoaluminate cement and phosphate cement. It is prepared to meet the needs of the development of cement and its application technology. The book is divided into nine chapters, which not only introduce various types of cement, but also introduce various types of concrete and their products made of these cements, and also give a proper introduction to the production process of concrete products and concrete admixtures.

It can be divided into three categories: general cement, special cement and characteristic cement, and the cement used for general civil construction is mostly general cement. General purpose cement, including Portland cement (P·I, P·I) Ordinary Portland cement (P·O), slag Portland cement (P·S·a, P·S·B), pozzolana Portland cement (P·P), fly ash Portland cement (P·F), composite Portland cement (P·C). Condensation time:

The time required for cement to start setting with water and stirring is called initial setting time. The time it takes from adding water to stirring to the completion of coagulation is called the final setting time. The initial setting time of Portland cement is not earlier than 45 minutes, and the final setting time is not later than 12 hours.

Volumetric stability: refers to the uniform properties of the cement during the hardening process of volume change. There are many impurities in the cement, which will produce uneven deformation.

It plays a coagulation role, and usually the higher the standard of cement, the higher the solidification content in it. It is cemented together with aggregates such as sand and gravel to form a solid whole, which is what we often call concrete. When cement is mixed with the right amount of water, it begins to form a plastic slurry that is machinable.

Over time, the slurry gradually loses its plasticity and becomes a tight state that cannot flow, after which the strength of the slurry gradually increases until it finally becomes a stony solid with considerable strength.

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There are many types of cement, which can be divided into two categories: general cement and special cement according to the use and performance of cement.

1) General water late mud: the cement usually used in civil engineering construction projects.

2) Special cement: cement with special properties or uses for dispersion. Such as: fast-hardening Portland cement, low-heat slag Portland cement, etc.

Cement is an indispensable building material, which is widely used in Shanshen construction, roads, bridges, tunnels, water conservancy projects and other fields. Depending on its use, cement can be divided into the following types.

1. Ordinary Portland cement.

Ordinary Portland cement is a commonly used cement variety that is widely used in various construction projects. It has the characteristics of high strength, fast hardening speed and good durability, and is suitable for making concrete, blocks, bricks, stone and other building materials.

2. High-performance cement.

High-performance cement is a new type of cement with the characteristics of high strength, high durability and high crack resistance. It is suitable for making high-strength concrete, high-rise buildings, large bridges, tunnels and other projects.

3. Sulfoaluminate cement.

Sulfoaluminate cement is a special cement variety, which has the characteristics of acid and alkali resistance, high temperature resistance, and corrosion resistance. It is suitable for making acid-alkali resistant bricks, refractory bricks and other materials for chemical, metallurgy, electric power and other industrial equipment.

Fourth, white cement.

White cement is a special cement variety that has the characteristics of white, smooth and delicate. It is suitable for making materials such as high-end architectural decoration, sculptures, floor tiles, etc.

5. Fast-hardening cement.

Fast-hardening cement is a special cement variety with fast hardening speed and high strength. It is suitable for making projects such as emergency repair, rapid construction, etc.

In short, cement is an indispensable kind of Jianxunwei building materials, different cement varieties are suitable for acres and used for different projects, and choosing the right cement varieties can improve the quality of the project, reduce costs and save time.

Hello, glad to answer for you :

1) According to the main hydraulic substance of cement: Portland cement (the main hydraulic substance is calcium silicate), housing: Portland cement (the main hydraulic substance is calcium aluminate), sulfoaluminate cement (the main hydraulic substance is calcium sulfoaluminate), etc.

Because of their different hydraulic materials, their properties are also different, such as aluminate cement sets quickly. High strength, good heat resistance and sulfate corrosion resistance; Sulfoaluminate cement will expand in volume after hardening, etc.

2) According to the use of cement, it is divided into: general cement (used for general construction projects. Mainly five kinds of cement of Portland), special cement (refers to the cement 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 expanded cement, low-heat cement, colored cement, white cement, etc.).

Ordinary cement is generally used in general civil engineering, works subject to freezing and projects with high strength.

There are two main types of ordinary cement. 325 and 425, which are commonly used.

It is used for interior decoration, brickwork, such as tiling, leveling, wall building, etc.

For example, the cement floor of the office should be high-grade to increase the service life and not sand.

1. Portland cement;

2. Ordinary Portland cement (referred to as ordinary cement);

3. Slag Portland cement (also known as slag cement);

4. Pozzolana Portland cement (also known as pozzolana cement);

5. Fly ash Portland cement (also known as fly ash cement).

Ordinary cement is suitable for the preparation of concrete, reinforced concrete and prestressed concrete in the ground, underground and water, and is used for projects with high early strength requirements, as well as structures with repeated freeze-thaw action and the preparation of various building mortars. Cement strength is an important indicator of cement. The new cement strength grade value standard is divided into grade, grade, grade, grade, and grade.

The minimum strength grade of cement is graded, and the month is equivalent to the original No. 425 cement, and the original tremor contains the cement below No. 425 and is cancelled. The commonly used new strength grade of cement is virtual hole Jane5。

According to its main components, it is divided into Portland cement, aluminate cement, sulfoaluminate cement and phosphate cement. According to the use and performance of cement, it can be divided into general cement (such as Portland cement, slag Portland cement, etc.), special cement (such as medium and low heat cement, etc.) and characteristic cement (such as fast-hardening Portland cement, expanded cement, etc.).

Composition, tricalcium silicate (3CaO·SiO2, abbreviated as C3S, accounting for 36% 60%), dicalcium silicate (2CaO·SiO2, abbreviated as C2S, accounting for 15% 37%), tricalcium aluminate (3CaO·Al2O3, abbreviated as C3A, accounting for 7% 15%), tetracalcium iron aluminate (4Cao·Al2O3·Fe2O3, abbreviated as C4AF, accounting for 10% 18%).

Hehe, this problem may be studied in a special class! In fact, you can take a look at the library, encyclopedia, etc., and you will know!

1) Cement: Powdered hydraulic cementitious material that can cement sand, stone and other materials that can be hardened in air and water.

2) Portland cement: a hydraulic cementitious material made of Portland cement clinker, 0% 5% limestone or granulated blast furnace slag, and an appropriate amount of gypsum grinding, which is called Portland cement.

3) Ordinary Portland cement: a hydraulic cementitious material made of Portland cement clinker, 6% 15% mixed material, and an appropriate amount of gypsum grinding, called ordinary Portland cement (referred to as ordinary cement), code: .

4) Slag Portland cement: a hydraulic cementitious material made of Portland cement clinker, granulated blast furnace slag and an appropriate amount of gypsum grinding, called slag Portland cement, code:.

5) Pozzolana Portland cement: a hydraulic cementitious material made of Portland cement clinker, pozzolana mixture and an appropriate amount of gypsum grinding. It is called pozzolana Portland cement, code: .

6) Fly ash Portland cement: a hydraulic cementitious material made of Portland cement clinker, fly ash and an appropriate amount of gypsum grinding, called fly ash Portland cement, code: .

7) Composite Portland cement: a hydraulic cementitious material made of Portland cement clinker, two or more specified mixed materials and an appropriate amount of gypsum grinding, which is called composite Portland cement (referred to as composite cement), code.

8) Medium-heat Portland cement: a hydraulic cementitious material with moderate hydration heat made of Portland cement clinker of appropriate composition and fine grinding with an appropriate amount of gypsum.

9) Low-heat slag Portland cement: a hydraulic cementitious material with low heat of hydration made of Portland cement clinker of appropriate composition and fine grinding with an appropriate amount of gypsum.

10) Fast hardening Portland cement: Cement with an appropriate amount of gypsum added to Portland cement clinker and ground fine to make cement with high early strength and 3-day compressive strength.

11) Sulfate-resistant Portland cement: Cement with good sulfate corrosion resistance made of Portland cement clinker and an appropriate amount of gypsum grinding.

12) White Portland cement: white cement made by adding an appropriate amount of gypsum to the clinker of Portland cement with less iron oxide content and grinding finely.

13) Road Portland cement: a hydraulic cementitious material made of road Portland cement skillfully, 0% 10% active mixed material and an appropriate amount of gypsum grinding, called road Portland cement, (referred to as road cement).

14) Masonry cement: It is made of active mixed materials, adding an appropriate amount of Portland cement clinker and gypsum, and grinding it into low-grade cement mainly used for masonry mortar.

15) Oil well cement: Cement suitable for cementing of oil and gas wells under certain well temperature conditions made of Portland cement clinker, appropriate gypsum and mixed materials composed of appropriate minerals.

16) Gypsum slag cement: Granulated blast furnace slag is used as the main component material, and an appropriate amount of gypsum, Portland cement clinker or lime is added to make cement.

Cement is divided into the following according to its use and performance:

1) General cement: cement usually used in general civil engineering and construction projects. General cement mainly refers to:

GB175-1999, GB1344-1999 and GB12958-1999 specified six categories of cement, namely Portland cement, ordinary Portland cement, slag Portland cement, porosyl Portland cement, fly ash Portland cement and composite Portland cement.

2) Special cement: cement for special purposes. Such as: G-grade oil well cement, road Portland cement.

3) Characteristic cement: a certain cement with outstanding performance. Such as: fast-hardening Portland cement, low-heat slag Portland cement, expanded sulfoaluminate cement.

Cement is divided into the following according to the name of its main hydraulic substance

1) Portland cement, commonly known as Portland cement abroad;

2) Aluminate cement;

3) sulfoaluminate cement;

4) Ferro-aluminate cement;

5) Fluoroaluminate cement;

6) Cement with volcanic ash or potentially hydraulic and other active materials as the main components.

The main technical characteristics are divided into:

1) Fast hardness: it is divided into two categories: fast hard and extra fast hard;

2) Heat of hydration: divided into two categories: medium heat and low heat;

3) Sulfate resistance: there are two types of sulfate corrosion resistance and high sulfate corrosion resistance;

4) Expansiveness: It is divided into two categories: swelling and self-stress;

5) High temperature resistance: The high temperature resistance of Portland cement is graded by the alumina content in the cement.