What is Portland cement? What is Portland Cement?

Because the cement is made of calcium silicate.

as the main material. All Portland cement clinker based on calcium silicate, limestone or granulated blast furnace slag below 5%, and hydraulic cementitious materials made of appropriate gypsum grinding are collectively referred to as Portland cement, and are collectively referred to as Portland cement in the world.

China's standards stipulate that general cement includes:

Portland Type I cement (: Portland cement clinker + gypsum.

Portland type II cement (: Portland cement clinker + gypsum + mixed material below 5%.

Ordinary Portland cement.

Portland cement clinker + gypsum + 5 20% mixed lumber.

Slag Portland cement (: Portland cement clinker + gypsum + 20 70% slag (limestone, kiln ash, fly ash and pozzolana ash below 8% are allowed.

A material in the mass mixture instead of slag).

Pozzolana Portland cement (: Portland cement clinker + gypsum + 20 50% pozzolana ash.

Fly ash Portland cement (: Portland cement clinker + gypsum + 20 40% fly ash.

Composite Portland cement (: Portland cement clinker + gypsum + 20 50% two or more mixed materials.

Cement is generally divided into ordinary Portland cement, Portland cement mixed with mixed materials and special cement.

Ordinary Portland cement: It is finely ground and mixed by limestone, clay and iron ore powder in proportion, and the mixture at this time is called raw meal. Then calcination is carried out, the general temperature is about 1450 degrees, and the product after calcination is called clinker.

Then the clinker and gypsum are ground together and mixed in proportion to be called cement.

Portland cement mixed with mixed materials is to add other substances to ordinary Portland cement in proportion and certain processing procedures to achieve special effects, such as slag cement, porosyl Portland cement, fly ash Portland cement, composite Portland cement and so on. The raw materials of these cements are more active mixed materials or non-reactive mixed materials than the original ordinary Portland cement.

Special cement is somewhat different in material stage and production process, for example, the material of high-alumina cement (aluminate cement) is bauxite and limestone after calcination to obtain clinker, and then ground to become aluminate cement.

There are other characteristics of cement that are less used, such as white cement, which is mainly used for decorative projects, and the materials are pure kaolin, pure quartz sand, pure limestone, and calcined mature material at a suitable temperature.

All Portland cement clinker based on calcium silicate, limestone or granulated blast furnace slag below 5%, and a hydraulic cementitious material made of an appropriate amount of gypsum grinding are collectively referred to as Portland cement. Internationally, it is collectively known as Portland cement.

In layman's terms, it is ordinary cement. It's Portland cement.

The combined name of ordinary Portland cement and slag Portland cement.

According to the provisions of "Portland Cement, Ordinary Portland Cement" and "Cement Mortar Strength Test Method (ISO Method)", cement and standard sand are mixed according to 1:3, and the water-cement ratio is used to make specimens according to the specified method, and the compressive strength and flexural strength of 3D and 28D are measured in water at standard temperature (200C 1). According to the measurement results, Portland cement is divided into

5r
.5R, and other six strength levels. The code R stands for early-strength cement.

A certain strength grade cement must reach the specified compressive strength and flexural strength at the same time. If one of them is less than the specified value, the cement should be lowered to one level for use.

1.The main model of Portland cement is the type of cement, which is mainly used in the project where the strength of the cement hard is higher. 2.

The main model of ordinary Portland cement is the type of cement roller, which is mainly used in ordinary dry environment, and can also be used in colder areas. 3.The main model of slag Portland cement is the type of cement, which is mainly used in the environment of high humidity, and the underwater use has the irreplaceable role of other types of cement.

4.The main model of pozzolana Portland cement is the type of cement, which is generally used in an ordinary environment, and the type of cement is strictly forbidden to be used in a dry or cold environment.

Correct Answer: Portland cement: Any hydraulic cementitious material made of Portland cement clinker, 0 5 limestone or granulated blast furnace slag, and an appropriate amount of gypsum grinding, is called Portland cement.

Portland cement is divided into two types, and the portland cement without mixing materials is called P· When Portland cement clinker is grinding, it is called Portland cement that is mixed with limestone or granulated blast furnace slag mixture material that does not exceed the amount of cement 5, code P·

Cement is Portland, and cement is divided into six categories, namely Portland cement, ordinary Portland cement, slag Portland cement, porosyl Portland cement, fly ash Portland cement and composite Portland cement.

1. 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, which is commonly known as Portland cement abroad.

2. Ordinary Portland cement: a hydraulic cementitious material made of Portland cement clinker, 6% 20% mixed material, and an appropriate amount of gypsum grinding, called ordinary Portland cement (referred to as ordinary cement), code: .

3. Slag Portland cement: a hydraulic cementitious material made of Portland cement clinker, 20% 70% granulated blast furnace slag and an appropriate amount of gypsum grinding, called slag Portland cement, code: .

4. Pozzolana Portland cement: a hydraulic cementitious material made of Portland cement clinker, 20% 40% pozzolana mixed material and an appropriate amount of gypsum grinding, called porosyl Portland cement, code: .

5. Fly ash Portland cement: a hydraulic cementitious material made of Portland cement clinker, 20% 40% fly ash and an appropriate amount of gypsum grinding, called fly ash Portland cement, code: .

6. Composite Portland cement: a hydraulic cementitious material made of Portland cement clinker, 20% 50% two or more specified mixed materials and an appropriate amount of gypsum grinding, called composite Portland cement (referred to as composite cement), code.