The stone is 20mm C25 concrete, and the mix ratio is 40

a) Determine the water-cement ratio:

w。/c。=a[fc] ([fh]+ab[fc])fh] configuration strength = [fd]+

Design C25 concrete = [FD]=25, using cement, [FC]=2) according to the maximum particle size of pebble gravel and construction slump requirements to check the table to determine the water consumption W.

3) Determine the amount of cement to be used. =w。/（w。/c。4) Determine the sand rate according to the maximum particle size of crushed stone and the water-cement ratio [sp] 5) Calculate the amount of sand and stone.

c。/[ρc]+w。/[ρw]+s。/[ρs]+g。/[ρg]+10α=1000

s。/（s。+g。）=[sp]

It is the gas content of the concrete mixture (generally 1).

Second, the test mix inspection and adjustment and workability to determine the benchmark mix ratio.

C base = c. Mix q total *[oh solid] ....

3. Test the strength to determine the experimental mix ratio.

Water-cement ratio + test, drawing [gray-water ratio - 28-day strength] to meet the requirements of water-cement ratio - both meet the requirements, there is the least amount of cement).

c=（c/w）*w。Mix q total * [oh] Fourth, determine the construction mix ratio (the moisture content of sand and gravel at the construction site is different).

Cement Variety Concrete Grade Ratio (Unit) kng Collapse mm Compressive Strength N mm2 Cement Sand and gravel water 7 days 28 days C20 300 734 1236 195 35 1 2

How to mix C25 concrete? How much cement, gravel, sand, and water do you need for a cube of concrete?

Pro, one side of C25 concrete, the mix ratio is cement: sand: stone:

Water = 1::: That is, one side of C25 concrete, you need 370kg of cement, 582kg of sand, 1287kg of crushed stone, and 175kg of water. One side of C30 concrete, the mix ratio is cement:

Sand:pebble:water = 1:::

That is to say, one side of C30 concrete, you need 400kg of cement, 512kg of sand, 1252kg of gravel, and 175kg of water.

Build your own house or use it as a construction unit? If the construction unit uses it, it should do various material testing and do laboratory mixing.

C20: Cement strength: pebble concrete cement surplus coefficient The maximum particle size of coarse aggregate is 20mm, and the slump is 35 50mm

Amount of material per cubic meter: water: 190 cement: 404 sand: 542 stone: 1264 The mix ratio is: 1:: sand rate 30% water-cement ratio:

C25: Cement strength: pebble concrete cement surplus coefficient Coarse aggregate maximum particle size 20mm Collapse 35 50mm

Amount of material per cubic meter: water: 190 cement: 463 sand: 489 stone: 1258 The mix ratio is: 1:: sand rate 28% water-cement ratio:

The mix ratio of C25 concrete is: . That is, the amount of various materials in 1 cubic meter of concrete is: 175kg of water, 398kg of cement, 566kg of sand, and 1261kg of stone.

The strength of concrete preparation should be calculated as follows: fcu, 0 fcu, k+;

Where: —Standard deviation of concrete strength (n mm2). Take =;

fcu,0 - concrete preparation strength (n mm2);

fcu, k - the standard value of the compressive strength of the concrete cube (n mm2), take fcu, k = 20 (n mm2).

Principles of concrete mix design:

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

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

3. Concrete should have good durability;

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

Basic requirements for designing concrete mixtures:

1. Meet the strength grade of concrete design.

2. Concrete and workability that meet the construction requirements.

3. Durability to meet the requirements of concrete use.

4. To meet the above conditions, save cement and reduce the cost of concrete foundation.

Basis for mix design:

1. Concrete design strength grade.

2. Engineering characteristics (the environment where the project is located, structural section, minimum clear distance of steel bars, etc.) 3. Cement varieties and strength grades.

4. The types and specifications of sand and stone, the apparent density and the maximum particle size of the stone.

5. Construction methods.

In the decoration of the house, we will always use a variety of materials, so that we can sell our house more beautiful, for example, fine stone concrete is one of the more common, at the same time, because fine stone concrete according to the compressive strength of different, can be divided into C30, C25, C20, etc., so what is the C25 fine stone concrete mix ratio? Let's take a look with me.

The formula ratio of C25 fine stone concrete is mainly composed of crushed stone, cement soil, sand and gravel, and water, so each cubic meter of C25 concrete needs to use 372kg of cement, 175kg of sand, 593kg of crushed stone, and 1260kg of water; However, the above are the theoretical mix ratio of the laboratory, and in the actual construction ratio, the moisture content of the sand and stone should be adjusted accordingly.

What are the advantages of fine stone concrete.

1. This kind of product has excellent compactness, and can make the construction more stable, so many construction personnel will use fine stone concrete to improve production efficiency; Because the material does not need to be vibrated in use, it can greatly shorten the time required for concrete pouring, reduce the strength of workers, and reduce the number of workers required.

2. Because this kind of product can improve the working atmosphere well during construction, it can greatly improve the safety, and at the same time, fine stone concrete can not only reduce workers from vibration noise, but also avoid diseases such as arm vibration syndrome that occur when workers hold the vibrator for a long time.

3. From the point of view of surface quality, it is better than ordinary materials, there will be no surface bubbles or honeycomb surface, and there is no need to repair, which can restore the texture or shape of the surface of the template more realistically, and the fine stone concrete can also increase the degree of freedom of building structure design, and the material can be directly poured into a structure with complex shape, thin walls and dense reinforcement.

Summary: Well, the above is about the C25 fine stone concrete mix ratio is the content of the introduction, I hope to provide you with some help, I believe that in the future in the C25 fine stone concrete mix ratio of what is the understanding process, friends will be more handy, get their own satisfactory answers.