What is the impermeability of C20 ordinary concrete?

Impermeable concrete has nothing to do with the strength grade, only its impermeability grade.

The impermeability grade (P) indicates the level of impermeability of the concrete. The impermeability grade is determined by the maximum water pressure that can be withstood by the standard specimen at the age of 28 days and tested according to the standard test method. GB 50164 "Concrete Quality Control Standard" According to the maximum water pressure that concrete specimens can withstand during the impermeability test, the impermeability grades of concrete are divided into five grades: P4, P6, P8, P10, and P12.

Correspondingly, it indicates the maximum water pressure of 4 of the 6 specimens in a group of 6 specimens during the concrete impermeability test, when there is no water seepage.

For example. The impermeable water pressure value required for the fitting should be higher than the design MPA. The mixture ratio with the largest water-cement ratio should be used for the impermeability test: impermeability grade and maximum water-cement ratio.

C20 C30 C30 or more.

p6p8～p12

The impermeability test results of P12 should meet the requirements of the following formula: P in the PT P 10+ formula - the impermeability level required by the design.

C20 concrete has poor impermeability due to the large water cement, and if it is not mixed with admixtures or admixtures to improve the compactness.

It will definitely not work after a long time, and it depends on the depth of embedding and water pressure.

To achieve this level of impermeability, the following measures can be employed:

Choose concrete materials with high density and good impermeability;

Appropriate admixtures, such as fly ash, silica fume, etc., are used to increase the compactness and impermeability of concrete;

control the mix ratio of concrete to make it have high strength and compactness;

Adopt appropriate construction techniques, such as vibration, curing, etc., to ensure the compactness and impermeability of concrete;

Select appropriate waterproof Qidasen materials and construction technology, such as waterproof coatings, waterproof membranes, etc., to enhance the impermeability of concrete.

To sum up, achieving the impermeability level of concrete quietly per mu P20 requires the synergy of many factors such as comprehensive material selection, deployment, and imitation construction.

Dear, hello, concrete C20 and C25 require antifreeze F50 and impermeable W6 to be added with antifreeze and impermeable agent. According to the requirements of concrete C20 and C25, antifreeze F50 and impermeable W6 must be added with antifreeze and impermeable agent, which is to ensure the performance of concrete, so that it has good frost resistance and impermeability to ensure the service life of concrete. In the construction process, attention should be paid to the mix ratio of concrete, the frost resistance and impermeability of concrete depends on the mix ratio of the wheel change concrete, therefore, in the construction process, the mixture ratio of Tongmingyi concrete should be noted to ensure the performance of concrete.

There is no quantitative relationship between the specific relationship between concrete's impermeability and its strength grade. Generally speaking, the denser the concrete, the higher the impermeability and the higher the strength, but this is not a proportional relationship, such as concrete cracking, which has high strength but is still permeable. Practice shows that there are many C20 concrete with high impermeability, but C30 with low impermeability.

In order to improve the impermeability of concrete, in addition to the strength factor, we should also start from improving the compactness, and control it from many aspects such as raw materials, mix ratio, working performance of mixture, construction, and maintenance.

From your question, the impermeability level is S6, which just means that they have the same impermeability target and impermeability level. When it comes to impermeability, it's hard to draw conclusions.