C25 self mixed concrete mix ratio table

1. C25 concrete mix ratio.

Cement: Water: Sand: Crushed Stone.

2. Adjust the water-cement ratio.

Adjust the water-cement ratio to 175kg, the amount of cement is MCO=175, and the amount of sand and stone calculated by weight method is: MSO==579KG, MGO=1229KG

3. Trial, adjustment and determination of concrete mix ratio.

Try the mix ratio 1 and 2, and test mix separately:

Mix 1: Cement: Water: Sand: Crushed Stone = 372:175:593:1260 = 1:::

The dosage of the test mix material is: cement: water: sand: gravel = ::

After mixing, slump.

is 30mm, to meet the design requirements;

Mix 2: Cement: Water: Sand: Crushed Stone = 417:175:579:1229 = 1:::

The dosage of the test mix material is: cement: water: sand: gravel = ::

After mixing, the slump is only 20mm, which cannot meet the design requirements, so keep the water-cement ratio unchanged, increase the cement dosage by 500g, increase the mixing water by 210g, and then mix, the slump reaches 35mm, which meets the design requirements. At this time, the actual amount of each material is: cement:

Water: Sand: Crushed Stone = ::

After strength testing (see test table for data), the mix ratio strength of group 1 and group 2.

All meet the requirements of trial strength, comprehensive economic benefits, and determine the mix ratio as the first group, namely:

Cement: Water: Sand: Crushed Stone.

372 ：175 ：593 ：1260kg/m3

Concrete grade C25

Cement strength grade.

Crushed stone concrete.

Cement surplus factor.

Aggregate particle size 20mm

Collapse 55-70mm

Amount per cubic meter.

Water, cement, sand, gravel.

Mix ratio. Water, cement, sand, gravel.

The sand content ratio is 35%.

water-cement ratio;

Mix ratio 1:

Cement: Water: Sand: Crushed Stone = 372:175:593:1260 = 1:::

The dosage of the test mix material is: cement: water: sand: gravel = ::

After mixing, the slump is 30mm, which meets the design requirements;

Mix 2: Cement: Water: Sand: Crushed Stone = 417:175:579:1229 = 1:::

The dosage of the test mix material is: cement: water: sand: gravel = ::

It's useless for me to give it to you. To be based on the strength of the cement. Sand moisture content. All aspects to consider.

You can look at the concrete mix design.

The self-run ratio table can generally have different proportioning methods in different mixing plants.

Cement 28 days strength (, sand is medium sand, mud content does not exceed 4%, concrete slump 30-50mm, concrete preparation strength 30mpa, then: cement dosage 442-388 water 193-190 sand 554-599 stone 1234-1243kg.

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Cement: Water: Sand:

Gravel = 372:175:593:

1260 = 1::: The amount of test mix material is: cement:

Water: Sand: Crushed Stone = ::

After mixing, the slump is 30mm, which meets the design requirements;

Concrete, abbreviated as "concrete (tóng)": refers to the general term for engineering composite materials that are cemented into a whole by cementitious materials. The word concrete usually refers to the use of cement as cementitious material, sand and stone as aggregates; Cement concrete, also known as ordinary concrete, is widely used in civil engineering engineering when it is mixed with water (which can contain admixtures and admixtures) in a certain proportion and is mixed to obtain cement concrete.

Concrete has the characteristics of abundant raw materials, low cost and simple production process, so that the amount of concrete is getting larger and larger. At the same time, concrete also has the characteristics of high compressive strength, good durability and wide range of strength grades. These characteristics make it widely used, not only in various civil engineering projects, but also in shipbuilding, machinery industry, marine development, geothermal engineering, etc., concrete is also an important material.

Concrete is a building material full of life. With the continuous development of concrete composition materials, people's understanding of material composite technology is constantly improving. The performance requirements for concrete are not only limited to compressive strength, but on the basis of strength, more attention is paid to the balance and coordination of comprehensive indicators such as durability and deformation performance of concrete.

The requirements for various performance indicators of concrete are clearer, more detailed and more specific than before. At the same time, the improvement of the level of construction equipment and the continuous emergence and promotion of new construction technology have made concrete technology adapt to different design, construction and use requirements, and develop rapidly.

C25 concrete mix ratio: a, cement: water:

Sand: gravel = 372:175:

593:1260=1:::b, the dosage of test mixing material is:

Cement: Water: Sand:

Crushed stone = :::c, after mixing, the slump is 30mm, which meets the design requirements.

The strength standard value is a value in the overall distribution of cubic compressive strength, and the percentage of strength below this value does not exceed 5%, that is, there is a 95% guarantee rate. The strength of concrete is divided into twelve grades.

The above is the relevant answer to this question, I hope it can help you, thank you.

C25 concrete mix ratio (1) C25 concrete mix ratio 1a, cement: water: sand:

Gravel = 372:175:593:

1260=1:::b, the amount of test mix material is: cement:

Water: Sand: Crushed Stone = ::

c. After mixing, the slump is 30mm, which meets the design requirements. (2) C25 concrete mix ratio 2A, cement: water:

Sand: gravel = 417:175:

579:1229=1:::b, the dosage of test mixing material is:

Cement: Water: Sand:

Gravel =:::c, after mixing, the slump is only 20mm, which cannot meet the design requirements, so keep the water-cement ratio unchanged, increase the amount of cement by 500g, increase d, add 210g of mixing water, and then mix, the slump reaches 35mm, which meets the design requirements.

All kinds of materials used in your concrete should be sampled and sent for inspection, the specific quantity is best to consult the local construction engineering testing center, generally, C25 strength concrete trial sampling, cement at least 10 kg, sand 20 kg, stone 30 kg. Sand and gravel is dry.

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Concrete grade C25

Cement strength grade.

Crushed stone concrete.

Cement surplus factor.

Aggregate particle size 20mm

Collapse 55-70mm

Amount per cubic meter.

Water, cement, sand, gravel.

Mix water, cement, sand, gravel.

The sand content ratio is 35%.

water-cement ratio;

The concrete mix has a lot to do with the cement grade, the type and particle size of sand and gravel.

The mix ratio is not universal, and it needs to be designed by itself in accordance with the regulations promulgated by the state.

The overall C25 concrete mix ratio is:

Cement: Water: Sand: Crushed Stone.

When setting the C25 concrete mix ratio, it is necessary to determine the concrete preparation strength first, and determine the concrete preparation strength according to JGJ T55 2000: (for 25MPa by.)

Then the basic parameters of the mix ratio are selected, water-cement ratio (W c): W c=AAFCE ( ; Selection of slump: slump is generally selected as 35 50mm; Selection of sand rate: The sand rate is generally selected as 32;

Water Consumption Selection (MWO): The slump value and the maximum particle size of the crushed stone used are 40mm, and the water consumption MWO is 175kg; Cement dosage (mco): mco=175 ; Crushed stone dosage:

The amount of sand used mso = (mcp-mwo-mco) * = 593kg.

So the overall ratio is generally 1::

The three parameters of ordinary concrete mix design are: water-cement ratio, sand ratio and unit water consumption.

1. Water-cement ratio: the ratio of water to cement.

The determination of the water-cement ratio depends mainly on the strength and durability of the concrete.

From the perspective of strength, the water-cement ratio should be smaller, and the water-cement ratio can be determined according to the strength formula of concrete.

From the perspective of durability, the water-cement ratio is smaller, the cement consumption is more, the compactness of the concrete is high, and the durability is excellent, which can be met by controlling the maximum water-cement ratio and the minimum cement amount.

The water-cement ratio, which is determined by strength and durability, is often different, and a smaller value should be taken in this case. However, when the strength and durability are satisfied, the water-cement ratio should be larger to obtain higher fluidity.

2. Sand rate: the ratio of sand to gravel.

The sand rate should be considered mainly from two aspects: satisfying the workability and saving cement. Under the premise that the water-cement ratio and the amount of cement (i.e., the amount of cement slurry) remain unchanged, the sand rate should be the largest slump, and the sand rate with good cohesion and water retention is the reasonable sand rate, which can be preliminarily determined by the table and adjusted by test mixing.

In the case of satisfying the workability, the sand rate should be as small as possible to achieve the purpose of saving cement.

3. Unit water consumption: the ratio of aggregate to cement slurry.

Under the condition that the water-cement ratio and the amount of cement are unchanged, the unit water consumption actually reflects the proportional relationship between the amount of cement slurry and the amount of aggregate.

The amount of cement slurry should meet the requirements of wrapping the surface of coarse and fine aggregates and maintaining sufficient fluidity, but excessive water consumption will reduce the durability of concrete. When the water-cement ratio is within the range, the unit water consumption can be determined by the table according to the variety and maximum particle size of the coarse aggregate.

The water-cement ratio of C25 concrete is about 300 for cement.

The mix ratio should be determined according to the thickness of sand and gravel and the slump requirements of the concrete.

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

Adjustment steps: set the laboratory mix ratio for cementitious material: 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）。

Concrete mix design is a very important work in concrete engineering, which directly affects the smooth construction of concrete, the quality of concrete engineering and the cost of concrete engineering.

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 concrete costs.

Cement 28-day strength (, the sand is medium sand, the mud content does not exceed 4%, the concrete slump is 30-50mm, and the concrete preparation strength is 30MPa, then: the cement dosage is 442-388

Water 193-190

Sand 554-599

Stone 1234-1243kg.

Cement: Water: Sand: Crushed Stone.

Extended: C20 concrete mix.

Water, cement, sand, gravel.

175kg：343kg ： 621kg： 1261kg： 1 ：

C30 concrete mix.

Water: Cement: Sand: Pebbles 175kg: 461kg: 512kg: 1252kg: 1:

To calculate the mix ratio, not only these are needed, but also such as the type of coarse aggregate, the coefficient of cement affluence, the maximum particle size of coarse aggregate, slump, etc.

I can only give you an approximate calculation.

c25 ：

Is this ratio 425 cement?

I have a small software for matching, and I can pass on the words of the landlord to you.

325 cement with C25 concrete with the following:

Cement can be matched with C25 and C30 concrete, and higher grade concrete should be used with higher grade cement. C25 concrete with silicon, because the strength of the concrete takes the strength of the cement, so the cement used configuration C30, in addition, the strength of the concrete is related to many aspects, and it is not that the higher the cement grade, the better.

2) C25 concrete mix ratio (in fact, the concrete material should be adapted to determine after the test and test and give the concrete mix ratio report). Here it is assumed that the cement is r, and the slump is 120.

Calculated according to the ratio notice of the construction engineering quality inspection center, if there is no ratio notice of the construction engineering quality inspection center, you can refer to the ratio table behind the quota.

3) C25 concrete mix ratio.

Cement: Water: Sand: Crushed Stone.