What does 425 cement mean What is the difference between 425 cement and 325 cement

425 cement: 425 is the strength grade of cement, representing the compressive strength after 28 days.

For. The strength grade of cement is a sign of the strength of cement, the measurement index is the compressive strength of cement, and the testing standard is mainly cement mortar.

Strength after 28 days of induration. In addition to 425, there is also 325 cement.

and 525 cement, for example, 525 cement represents the compressive strength after 28 days.

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.

Meaning: 28 days of cement with a compressive strength of 32 5MPa.

The strength of cement is the degree of solidity after condensation and hardening after cement is mixed 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).

This method is to mix 1:3 cement, standard sand (Fujian Pingtan white quartz sand) and the specified water with cement according to the prescribed method to make soft punching glue sand, and make 7 07 7 07 7 07cm cubic compressive test block and 8-shaped tensile test block, keep it under standard conditions, measure the compressive strength and flexural strength for 3 days and 28 days respectively, and group the test blocks for an average of 28 days.

The compressive strength should determine the cement grade, but the compressive strength of 3 days and 7 days must also meet the specified requirements. According to the current national standard "Cement Mortar Strength Test Method", 1:2 5 cement and standard sand are used to make 4cm 4cm 16cm standard specimens according to the specified water-cement ratio (0 44 or 0 46).

Under standard maintenance conditions, when the specified age period (3d, 28d or 3d, 7d, 28d) is reached, its flexural and compressive strength should be measured, and the grade should be assessed according to the minimum strength value specified in the national standard.

At present, the cement produced in China generally has 325 1045 1045 and other grades. The purpose of producing different grades of cement is to meet the needs of producing different grades of concrete.

The previous 425 cement is the current ISO international standard grade cement, which refers to the cement with 28 days of compressive strength. The cement of 525 is the current grade of cement, and the compressive strength reaches more than 28 days. For details, please refer to the national standard GB175-2007

With 450g of cement, 1350g of standard sand, 225ml of water made of 40x40x160mm cement mortar specimens, after 28 days of standard curing (temperature of 20 plus minus 2 degrees of water curing for 28 days), bending and compressive test, after the test data processing, compared with the national standard, there are three days of bending resistance, three days of compression, 28 days of bending resistance, 28 days of compressive strength four indicators, and finally named after the 28-day compressive strength index. 425 should refer to the compressive strength of 28 days or more.

r indicates cement with early strength performance requirements. No. 425 and No. 525 cement are divided into two types according to the early strength, namely 425 and 425R, and 525 and 525R, and the strength of each grade and type of cement shall not be lower than the value in the following table.

Marking Compressive Strength MPA Flexural Strength MPA

3 days 7 days 28 days 3 days 7 days 28 days.

425r —

525r —

Indicates the grade of cement, which is usually understood as the cement with the compressive strength reached, and can also be divided into two varieties, one of the most common cement varieties now.

Check out the national standard for ordinary Portland cement (GB175-2007).

It refers to cement with a strength grade.

The compressive strength of 28D reaches more than MPa, and I am engaged in the test! Do cement tests often!

Cement is an indispensable material in the decoration process, and there are many medium models of cement on the market in China, such as 225 cement, 325 cement and 425 cement and so on. So, what is the difference between 425 cement and 325 cement? What should I pay attention to when buying cement?

Let's find out together.

The difference between 425 cement and 325 cement is mainly in terms of hardness and strength, 425 cement is a hard cement, generally used for concrete and paving, etc., while 325 cement is a soft cement, mainly used for tiling, dismantling plastering and decoration. In addition, there is also a certain difference between these two types of cement, 425 cement is more expensive than 325 cement.

Precautions should be paid to the purchase of cement.

1. When buying cement, first of all, observe whether the paper bag packaging is intact and see if it has a logo. If the name of the cement is provided on the packaging bag, then it means that this kind of cement is a more practical, for example, the pozzolana cement is marked in black.

2. When buying cement, you can touch the cement powder with your own fingers, if you feel a little sand or powder during the touch, then it means that the fineness of the cement is normal. In addition, it is also necessary to observe its color, which is also very important, for example, to see if the color of the cement will show dark gray or dark green, the color determines the strength of the cement, if there is white slag, then it will affect the overall quality.

3. Generally speaking, when buying cement, everyone will look at its use date, if it has been used for more than a month, then its performance will be reduced. Usually the cement with good quality will not appear caking, and it can easily solidify in more than 6 hours.

Article summary: The above is all about the difference between 25 cement and 325 cement and what to pay attention to when purchasing cement, I hope it will be helpful to you. If you want to know more about it, please stay tuned to Qeeka Home.

Enter the area and get the decoration for free**].

There are also different types of cement, the more common ones are 325 types of cement, there are 425 models, and there are 525 types of cement in addition to co-combustion. These types of cement are widely used in the construction industry, and today I will introduce the difference between 325 cement and 425 cement Zhaoye.

1. What is the difference between 325 cement and 425 cement?

1. The biggest difference is the different strength, the compressive capacity of 425 type cement is more prominent than that of 325 cement. And after the end of construction, about a month or so, the compressive value of 325 cement can be reached, and the compressive strength of 425 type cement can be reached, which shows that the strength of 425 type cement is higher.

2. The reason for such strength is mainly that in the process of producing cement, the ratio of raw materials is different, and the firing time will be different, so cement of different strength will be produced to meet the needs of the market. Under normal circumstances, the 425 model of cement is more expensive than the 325 model of cement.

2. 325 cement or 425 cement for rural construction.

1. If it is a self-built house in the countryside, because some floors are relatively low, only one or two floors, you can choose 325 type cement, and its strength is enough to use. If you choose the 325 model, you can also save a lot of money.

The main thing about model cement and 425 type water is that their strength and setting time are different, so for some low-rise buildings, it is enough to choose 325 model. However, post-maintenance is very important, and it must be maintained frequently, otherwise the strength of the concrete will not meet the requirements.

3. For some frame structure houses, it is best to choose 425 model cement, which has a faster setting time. In addition, when laying roads or concrete, you need to choose 425 type cement.

Through the introduction, we have a certain understanding of the difference between 325 type cement and 425 type cement, the most important thing is that their strength is different, so we can choose different types of cement according to actual needs.

Do the math how much it will cost you to renovate your home

Cement markingThe difference between 325 and 425 is that the range of use is different, and the strength is different.

1. In terms of **, 425 type cement is slightly more expensive, mainly because of its much higher strength.

2. Another point is that the scope of use is different, if you choose 325 type cement, it is soft cement, which is used for tiling or plastering. The 425 type cement is a hard cement, which can be used to pave roads or beat concrete.

3. One of the most obvious differences is that the strength is different, choose 325 type cement, its strength can be reached, and 425 model cement is relatively high, reached.

The distinction between good and bad cement

1. When buying cement, you can directly observe, you can look at the outer packaging of cement, if it is an authentic merchant, it will have a factory number, as well as the packaging date. And this date is very important, because the cement also has a warranty period, and at the same time, it will also indicate the type of cement, which can indicate that the cement is officially produced. However, if it is a low-quality product, its logo is incomplete or vague.

2. Another point is to observe the color of cement, the color of normal cement is gray-white, if the color changes, it is inferior cement.

3. If it is fake cement, its feel must not be as good as the real cement, the ingredients in it are not authentic, there are many particles, and there is a phenomenon of agglomeration, while the normal cement has a certain fineness.

4. It can also be weighed, if you choose bagged cement, the weight of each bag is about 50 kg, and the error range will not be particularly large.

Summary. Hello dear Cement 325 and 425 are the grades of cement strength.

Hello dear Cement 325 and 425 are the grades of cement strength.

The main difference between cement grade 325 and 425 is that the hardness is not the same, the curved cement of 325 grade belongs to the soft water before the mud, and the cement of the 425 grade belongs to the hard cement.

Cement 325 belongs to soft cement, which is generally used for tiling, building a good wall, and brushing the wall; The decoration is also with 325. Cement 425 belongs to hard cement, which is mainly used for beating concrete, such as paving roads, building houses, etc. 325 indicates the compressive strength:

Pai 325 cement is a popular name, which generally refers to the cement with a strength grade, and does not specifically refer to a specific Youkai cement variety. The 28 d compressive strength of 325 cement is not less than. Portland cement: the density of ordinary cement.

425 refers to the compressive strength: 425 silicic acid permeable pre-salt cement, ordinary congqing cement is about tons per cubic meter, and the powder coal closed ash cement is a little smaller and each cubic meter is about tons. It is used for the grouting of the advance support of the guide pit of the double side wall of the tunnel.

The so-called 325 and 425 mainly refer to the grade of cement strength. At present, China's cement production mainly includes 225 and other grades. The strength of cement mainly refers to the size of the unit area, we know that after the cement is mixed with water and mixed to a pure car, it will be solidified and hardened.

In this series of processes, the strength of cement is determined by many factors, mainly including the mineral composition of the cement, the fineness of the particles, the temperature during hardening, and the ratio of cement and water.

Summary. The difference between 435 cement and 425 cement is that the hardness is different. 325 cement belongs to soft cement, and 425 cement belongs to hard cement.

The compressive strength is different. The 28-day compressive strength of 325 cement is not less than, and the 28-day compressive strength of 425 cement is not less than. Different uses.

325 cement is generally used to paste tiles, build walls, paint walls and plaster, decorate houses, etc. 425 cement is generally used to beat concrete, pave streets, ground, build houses, large columns, beams and slabs of bridges, etc.

435 cement and 425 cement cavity before the rise of the cavity do not say hello, the hardness is different. 325 cement belongs to soft cement, and 425 cement belongs to hard cement. The compressive strength is different.

The 28-day compressive strength of 325 cement is not lower than that of Wuqing, and the 28-day compressive strength of 425 cement is not less than. Different uses. 325 cement is generally used to paste tiles, build walls, paint walls and plaster, decorate houses, etc.

425 cement is generally used for beating concrete, paving streets, ground, building houses, large columns, beams and slabs of laughing bridges, etc.

1. The mixed materials of the two are different: PO cement is ordinary Portland cement, and PC cement is composite silica Portland cement. 2. The hardening speed is different

The hardening speed of PC425 cement is slow, and the hardening speed of PO425 cement is relatively fast. 3. Different compressive strength: the compressive strength of PC425 cement is better than that of Po425 cement.

PC425 cement is an ISO international standard grade cement, which refers to the cement with 28 days of compressive strength. PO425 is fast hardening, and it is ordinary Portland cement, and the compressive strength is not less than 28 days. About the cement label, 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 has5r
.

5r
.5r
.5R eight strength levels.

The strength grade with r indicates that the cement is early strength cement. Strength RatingThe 5R can be used in some house construction.

Above the strength grade, it can be used for the construction of larger bridges or factories, as well as for some important pavement surfaces and the manufacture of prefabricated components.