What is the percentage of C30 concrete mix?

Concrete strength grade: C30; Slump: 35-50mm;

Cement strength grade; sand species; medium sand;

The maximum particle size of the stone is 40mm; sand rate; 29％

Preparation strength: material dosage (kg m3).

Cement: 427kg

Sand: 525kg

Stones: 1286kg

Water: 175kg

Volume ratio: cement bulk 427kg (: sand: crushed stone:

C30 indicates concrete with a standard value of 30MPa for the compressive strength of the cube. The strength grade of concrete is divided according to the standard value of the cubic compressive strength grade. The strength grade of concrete is expressed by the standard value Fcu,K that conforms to the number C and the compressive strength of the cube, and the unit of measurement is MPa.

The standard value of cubic compressive strength refers to the compressive strength with 95% guarantee rate measured by the standard test method at the age of 28 days for a cube specimen with a side length of 150mm made and maintained by the standard method. There are a total of 12 grades of ordinary concrete strength grades.

C30 concrete mix ratio is: 1:: concrete: water: 175kg, cement: 461kg, sand: 512kg, stone: 1252kg.

There are two ways to express the C30 concrete mix ratio: one is the amount of various materials in 1 cubic meter of commercial concrete, such as 300 kg of cement, 180 kg of water, 690 kg of sand and 1260 kg of stone; The other is expressed by the ratio of cement per unit mass to the amount of various materials and the water-cement ratio of commercial concrete, for example, the preceding example can be written as: c:

s：g=1：：，w/c=。

Generally, the measures to ensure the strength of C30 concrete are mainly guaranteed from the following aspects:

1. Process: From the mixing, transportation, mold and vibration of concrete, the construction must be carried out in accordance with the corresponding process standards.

3. Machinery: Concrete mixing, pouring and transportation machinery must meet actual needs.

5. Link control: on-site management personnel must go to the site to inspect and stand next to the station to ensure the qualified requirements of each link. In terms of strength, C30 concrete should be required to be qualified.

Concrete strength grade: C30; Slump: 35-50mm;

Cement strength grade; sand species; medium sand;

The maximum particle size of the stone is 40mm; sand rate; 29％

Preparation strength: material dosage (kg m3).

Cement: 427kg

Sand: 525kg

Stones: 1286kg

Water: 175kg

Volume ratio: cement bulk 427kg (: sand: crushed stone:

C30 indicates concrete with a standard value of 30MPa for the compressive strength of the cube. The strength grade of concrete is divided according to the standard value of the cubic compressive strength grade. The strength grade of concrete is represented by the standard value of C, C, and the standard value of cubic compressive strength, Fcu, K, and the first unit of measurement is MPA.

The standard value of cubic compressive strength refers to the compressive strength of a cube specimen with a side length of 150mm made according to the standard method and cured by the stove excavation at the age of 28 days, measured by the standard test method with a guaranteed rate of 95%. There are a total of 12 grades of ordinary concrete strength grades.

The C30 concrete mix ratio is:

The so-called concrete construction mix ratio refers to the proportional relationship between the constituent materials in the concrete.

The concrete mix ratio of C10, C20, C25, etc. is the ratio between the various constituent materials (cement, water, sand, stone) in concrete.

Adjustment steps: set the laboratory mix ratio as: cement:

Water: Sand: Stone = 1:

x:y:z, the moisture content of the sand on site is m, and the moisture content of the stone is n, then the construction mix ratio is adjusted as:

1：(x-y*m-z*n)：y*（1+m）：

z*（1+n）。

Design basis: 1) Concrete mix design basis:

Code for Design of Ordinary Concrete Mix (JGJ 55 2011) "Code for Acceptance of Construction Quality of Concrete Structures" (GB 50204 2015) "Quality Control Standard for Concrete" (GB 50164 2011).

Test Method for Properties of Ordinary Concrete Mixture (GB T 50080 2002) "Test Method for Mechanical Properties of Ordinary Concrete" (GB T 50081 2002).

Concrete strength has not been tested and evaluated (GB T 50107 2010) and sand, stone, admixtures, admixtures related standards.

2) Principles of concrete mix design:

1. The workability of the concrete mixture can meet the needs of construction;

2. The strength of the concrete can meet the requirements of the design;

3. Concrete should have good durability;

4.In meeting the above requirements, minimize costs and increase benefits.

On December 28, 2000, the Ministry of Construction of the People's Republic of China approved the implementation of the industry standard "Design Regulations for Ordinary Concrete Mix" (JGJ 55 2000) on April 1, 2001. The original industry standard "Design Code for Ordinary Rental Concrete Mix Ratio" (JGJ T 55-96) shall be repealed at the same time.

This realignment is mainly a revision of the original industry standard "Design Code for Ordinary Concrete Mix" (JGJ T55-96).