How to indicate the code of ordinary cement and the cement model?

The classification and use of cement are as follows: 1. According to the use and performance, it is divided into: (1) General cement:

Cement is usually used in general civil engineering and construction projects. General cement mainly refers to the six categories of cement specified in GB175-2007, namely Portland cement, ordinary Portland cement, slag Portland cement, porosyl Portland cement, fly ash Portland cement and composite silicate.

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, phosphoaluminate cement and phosphate cement. 2. Cement is divided into Portland cement according to the name of its main hydraulic substance: (1) Portland cement, which is commonly known as Portland cement abroad; Cement in its original state.

2) Aluminate water....

Ordinary Portland cement, the difference between the three. In fact, the three cements are ordinary Portland cement, and the national standard stipulates that the code is, and the biggest difference between the three is the strength grade. Cement is commonly referred to as No. 400 cement; Cement is commonly referred to as No. 500 cement; The cement is early strength No. 500 cement (3 days of high strength, 28 days of the same strength), the specific indicators can be seen in the national standard (GB175-1999 Portland cement, ordinary Portland cement).

The strength grade of ordinary Portland cement shall not be less than that5r, In fact, most of the cement on the market now has admixtures that exceed the national standard, because the quality of the current rotary kiln clinker is very good, and it is a big waste to produce cement.

The cement grade is a sign of the strength of the cement, and the compressive strength of the cement grade is determined to refer to the strength of the cement mortar after 28 days of induration. For example, if the compressive strength after 28 days is 310 kg cm2, the cement is marked as 300. Those with a compressive strength of 300-400 kg cm2 are counted as 300.

There are six grades of ordinary cement. No. 200-300 can be used for some house construction.

Numbers 400 and above can be used for the construction of larger bridges or factories, as well as some important pavements and the manufacture of prefabricated components.

Labeling method. This method is to mix 1:3 cement, standard sand and specified water with cement to make soft rubber sand according to the prescribed method, and make a cube compressive test block of 7 07 x 7 07 x 7 07 cm and a figure-8 tensile test block, which are cured under standard conditions, and the compressive strength and flexural strength of 3 days and 28 days are measured respectively, and the average compressive strength of the group test block for 28 days is used to determine the cement number, but the compressive strength of 3 days and 7 days must also meet the specified requirements.

The main model of Portland cement is the type of cement, which is a specification model.

The cement is mainly used in projects with high cement induration strength requirements;

Ordinary Portland cement.

The main model is the type of cement, which is mainly used in ordinary dry environments, and can also be used in colder areas.

The main sliding locust of slag Portland cement is the model of cement, and the cement of this specification and model is mainly used in a high-humidity environment, and the underwater use has the irreplaceable role of other types of cement;

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;

The main model of fly ash Portland cement is the type of cement, and the use requirements of this specification and model of cement and pozzolana Portland cement are basically similar;

The main model of composite Portland cement is the type of cement, and the cement of this specification and model should be selected and used according to the proportion of its mixed materials.

The number of cement is an indicator of the "strength" of cement. The strength of cement is the size of the force per unit area, which refers to the degree of solidity of cement after condensation and hardening after mixing with water (the strength of cement is related to factors such as the mineral composition of cement, particle fineness, temperature and humidity during hardening, and the proportion of water added to cement).

The strength of cement is determined by the cement number.

The index is also the main basis for the selection of cement. The current method used to determine the strength of cement is the "soft method".

The cement mark represents the strength of the cement, which is hardened through the mixing of water and sand, which has a great relationship with the temperature and humidity at that time.

1. What are the types of cement labels?

1. The cement mark represents the strength of the cement, among which the number is 325 well, 425 well, 525 well and other several grades, different numbers of cement, the test range is also different, can be made into different grades of concrete.

2. For example, the most commonly used is ordinary Portland cement, which has a strength grade5r
.5r
.

5R and other different marking types. If it is or, it can be used for house construction. If the strength is above, it can be used for the construction of bridges or factories, or for important pavement construction.

3. When choosing cement materials, different numbers will basically be displayed on the packaging bag, such as Yes, these numbers represent different meanings, that is to say, what is the strength of the omen, so choose the matching one.

Second, the difference and use of 325 and 425 cement.

Cement is a kind of soft cement, generally speaking, it can be used for tiling or for building walls and painting walls. The difference between 425 and 325 is that it belongs to hard cement, and you can choose 425 type cement when laying concrete floors or building houses and pouring pillars.

2. It can be seen that the main difference between the two of them is different, mainly determined by the strength, so the choice of 325 type cement is basically used for decoration, and 425 cement is basically used for building houses.

In terms of comparison, the cement of the 325 model is lower than the rent of socks.

Portland cement strength grades have 6: Hongmin Xun5r
.5r
.There are 4 strength grades of 5R ordinary Portland cement5r, take andThere are 6 strength grades of 5R slag cement, pozzolane cement and fly ash cement

5r, cover this.

Ordinary Portland cement is marked with and.

Slag silicon lease defense Portland cement number has.

Pozzolana Portland cement is marked with etc.

Fly ash Portland cement standard defects are not missing, there is a waiting number or.

1.The main model of Portland cement is the type of cement, which is mainly used in projects with high requirements for cement induration. 2.

The main model of ordinary Portland cement is the type of cement, which is mainly used in ordinary dry environments, and can also be preferentially 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;

The strength grade of cement is a sign of cement strength, the measurement index is the compressive strength of cement, and the testing standard is mainly the strength of cement mortar after 28 days of induration. For example, if the compressive strength after 28 days is detected, the strength grade of the cement is set as grade or grade. Cement has:

Eight intensity levels. The strength grade with r indicates that the cement is early strength cement. Strength grades can be used in some house construction.

Above the strength level can be used for the construction of larger bridges or factories, as well as some important pavements and the manufacture of prefabricated components. There are no very detailed regulations on the use of cement strength grades, and generally speaking, clear regulations are given in the design drawings. In civil construction projects, ordinary Portland cement and slag Portland cement are generally used.

Strength grades are commonly used ,

Different cements, the grade of cement is different, and the strength grade of Portland cement is divided into six grades. The strength grades of ordinary Portland cement that are common in life are divided into four grades. The strength grades of slag Portland cement, pozzolana Portland cement, fly ash Portland cement, and composite Portland cement are divided into six grades.

The cement mark contains the strength of the cement after solidification, and the strength of the cement mark includes the tensile strength and compressive capacity of the cement after solidification. The higher the grade of cement, the stronger it is, and vice versa.

The cement marking also includes the solidification rate of cement, which is generally required to have a short solidification time in underwater engineering and other emergency projects, such as the construction of bridge piers and the construction of sewers. It is generally better to use fast-hardening cement with cement labels. For construction projects such as walls and floors, if there is no high requirement for the setting time of cement, you can choose cement with a slower cement setting time.

Ask what kind of cement is used for the water rise 1 hour after the stone rises.

Precautions for extended information: When choosing cement, it is necessary to choose according to different cement uses, and the scope of application of each cement label is different, for example, the drying speed of 525 cement is very fast and the strength is also very large. However, 525 cement is used in a hot, high-temperature and scorching environment, if it is used in masonry, the wall is easy to crack, so this 525 cement is generally used for paving floors.

In addition, the masonry wall is not all stressed walls, and the general 425 cement or 325 cement can meet the requirements of the preliminary construction.

Kiss. Normal 325Or cement No. 425 will do.

The commonly used grades of cement are: ordinary Portland cement, slag Portland cement, and pozzolana Portland cement!

There are four main types of cement: 325 cement, 425 cement, 525 cement and 625 cement, which are mainly distinguished according to the compressive strength of cement, such as 325 cement, which means that after the cement is cured, the compressive strength should be at least above, and only the strength of Portland cement can reach 625MPa.

Cement generally has ,,, these are commonly used, and there are also isohigh-strength cements.

Ordinary Portland cement is marked with and, slag Portland cement is labeled, and porosyl Portland cement is labeled.

There are many grades of cement, usually 425, and there are also 325, but the content is a little lower.

The cement floor is not the general number of cement, and the commonly used ones in our homes are 325 and 425. These two types of markings are more common. The quality of the 425 is a little higher,**. Slightly more expensive.

In general, I think that the punctuation marks of this cement are mainly different in this capital letter, because under normal circumstances, this cement is also divided into a certain grade, so the nature of their grade is also different, this product.

I think I can offer some references.

Hope it helps you with your questions.

Cement Marking Cement Grade Classification Standard: GB175-2007 Portland Cement Strength Grade is divided into six grades.

The strength grades of ordinary Portland cement are divided into four grades.

The strength grades of slag Portland cement, pozzolana Portland cement, fly ash Portland cement, and composite Portland cement are divided into six grades.

(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, code: Fenhe, 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 mixture and an appropriate amount of gypsum grinding. It is called pozzolana 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.