Does anyone know what commercial concrete C15 C80 means?

To put it simply, it is the strength of the concrete, C15 represents the compressive strength of 28 days after the concrete is poured to reach 15MPa, C80 represents the compressive strength of the concrete after 28 days after pouring can reach more than 80MPa, the larger the number after C, the higher the compressive strength of the concrete after hardening, the choice of which grade of concrete to use depends on the project situation, the wall plastering is less than 30, the road is more than 30, and the dam body is more than 50 high-strength concrete.

C15 C20---C80 and other consciousness is the concrete strength grade, commercial concrete consciousness is used for commercial circulation of concrete, as long as the mix ratio of the concrete mixing station meets the requirements you want to use, it is OK, the general housing construction and municipal use more, highways, railways are now generally their own construction of concrete mixing stations and supporting laboratories for centralized production.

Represents the standard value of concrete compressive strength The number after c indicates the strength value The unit is mpa is expressed according to the standard value of the compressive strength of the concrete cube standard test block (the cube with a side length of 150mm is the standard specimen, which is cured for 28 days under standard curing conditions, and the cube compressive strength with a 95% guarantee rate measured according to the standard test method).

C15 80 is the number of concrete, and the number after it represents how much MPA ...... the strength of concrete is in 28 days

The strength grade of concrete according to the standard compressive strength (the cube with a side length of 150mm is used as the standard specimen, cured for 28 days under standard curing conditions, and the compressive strength of the cube with a 95% guarantee rate measured according to the standard test method) is called the label, which is divided into C10, C15, C20, C25, etc.

The strength grade of the concrete composite structure is C140.

According to the query of the "State Intellectual Property Office of the People's Republic of China - Invention Patent Application" released by Douding.com, it is known that this invention is used in the public column of steel reinforced concrete combined with the strength of the structure Hu Feng grade C140 concrete, so the concrete C140 refers to a kind of concrete composite structure strength grade C140.

Concrete, abbreviated as:"Concrete (tóng).": refers to the aggregate cemented into a whole engineering composite material by cementitious materials. The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates; Cement concrete obtained by mixing with water (can contain admixtures and admixtures) in a certain proportion is also called ordinary concrete.

C10 is the code of the concrete strength grade in the building, which means 10Nm, that is, the square millimeter can bear about 1kg of weight, which is the same as the meaning of 10MPa.

The standard value of the compressive strength of the concrete cube is expressed in FCT in MPa.

GB50010 "Code for Design of Concrete Structures" stipulates that the standard value of compressive strength of concrete cube refers to the cubic standard specimen with a side length of 150mm made and cured according to the standard method, and the compressive strength of the cube with a 95% guarantee rate measured by the standard test method at the age of 28 days.

It means 10nm, that is, the square millimeter can bear about 1kg, which is the same as 10mpa.

Concrete tensile strength refers to the axial tensile strength of concrete, that is, the stress value obtained by dividing the maximum load load of the concrete specimen when it breaks after tensile force by the cross-sectional area, which is expressed by FCT in MPa.

It is the grade of concrete, which requires the strength of standard curing for 28 days to reach 10MPa, but now with the improvement of cement marking, there is generally no C10, and the lowest is C15.

C10 is the strength of the mixed territory according to the intensity! This value is obtained by curing 28 of the prepared mixed soil test blocks under standard conditions and then doing a compressive test!

C10 --- represents the concrete strength grade of the concrete with a standard value of 10n mm 2 for the compressive strength of the cube.

The strength grade of concrete should be divided by the standard value of the compressive strength of the concrete cube. It is expressed by the symbol C and the standard value of the compressive strength of the cube (in n mm2 or mpa). The compressive strength of concrete is obtained through experiments, and a cube with a side length of 150mm is used as the standard size specimen for the compressive strength of concrete.

The specification stipulates that a cube with a side length of 150mm is cured in humid air with a temperature and relative humidity of more than 95% at (20 2) for 28 days, and the compressive strength with a guarantee rate of 95% is measured according to the standard experimental method as the concrete strength grade. According to GB50010-2002 "Code for Design of Concrete Structures", ordinary concrete is divided into 14 grades, namely: C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80.

The factors affecting the strength grade of concrete are mainly related to cement grade and water-cement ratio, aggregate, age, curing temperature and humidity.

The classification of concrete is often based on the strength grade of the concrete.

According to the relevant standards, the concrete strength grade should be expressed by the first letter of the English name of the concrete plus its strength standard value. Such as C20, C30, etc. In the past, when "label" was used to describe strength grading, the value of the standard value of the compressive strength of the cube was expressed by the Chinese "number", such as 200, 300, etc.

C10 is equivalent to 100, and I remember that the strength of red bricks was 70 to 100. That is to say, the strength of C10 concrete is relatively low, and it is often used as a foundation cushion.

In the original system, which expressed the strength grading of concrete by label, the compressive strength of the concrete cube was expressed by "r".

According to the relevant standards, the strength of building materials is uniformly expressed by the symbol "f". The compressive strength of the concrete cube is "fcu". Among them, "cu" means cube.

For example, when the concrete strength grade is C20, FCU, K=20N mm2 (MPa), that is, the standard value of the 28D compressive strength of the cube is 20MPa.

Hydraulic buildings generally use 90d or 180d age of large-volume concrete, so the age of the lower corner mark after the C symbol, such as C9015, C9020 refers to the 90D age of compressive strength standard value of 15MPa, 20MPa hydraulic concrete strength grade, C18015 is expressed as 180D age of compressive strength standard value of 15MPa.

What does C15, C20, and C30 mean for engineering construction? I finally got it today.