The following figure shows the fraction of material used to make a concrete 1. What is the ratio of the materials used in this kind of concrete? 2. How many tons of each of the three materials are needed to prepare 180 tons of this kind of concrete? 3. If there are 50 tons of underground materials, how many tons of cement are left when all the yellow sand is used up? How many tons of stones will be added?

The following figure shows the fraction of material used to make a concrete 1. What is the ratio of the materials used in this kind of concrete? 2. How many tons of each of the three materials are needed to prepare 180 tons of this kind of concrete? 3. If there are 50 tons of underground materials, how many tons of cement are left when all the yellow sand is used up? How many tons of stones will be added?

The following figure shows the fraction of a concrete material: 1 part cement, 2 parts sand, 3 parts stone
1. What is the ratio of materials used in this kind of concrete?
Cement: yellow sand: Stone = 1:2:3
2. How many tons of each of the three materials are needed for 180 tons of concrete?
Cement 180 × 1 / (1 + 2 + 3) = 180 × 1 / 6 = 30 tons
Huangsha 180 × 2 / (1 + 2 + 3) = 180 × 1 / 3 = 60 tons
Stone 180 × 3 / (1 + 2 + 3) = 180 × 1 / 2 = 90 tons
3. If there are 50 tons of materials in each batch, how many tons of cement are left and how many tons of stones will be added when all the yellow sand is used up?
The remaining cement is 50-50 × 1 / 2 = 50-25 = 25 tons
Stone increase 50 × 3 / 2-50 = 75-50 = 25 tons

What is the formula of one cubic meter of C20 concrete? I hope it can be more detailed! I want to make the foundation of column billboard 18 * * 6m, 13m high!

Water: 175KG, cement: 343kg, sand: 621kg, stone: 1261kg
The mixture ratio was 0.51:1:1.81:3.68
42.5R cement

How much pressure can a square meter, 20 cm thick C20 concrete bear

The surface compressive strength of C 20 concrete is 20 MPa, that is 20 x 10 ^ 6 N / m2
It is said that one square meter can bear 20 x 10 ^ 6 (20000 KN) if it is placed on a hard horizontal surface and applied pressure on the concrete surface
It's very large. In the design, every square meter is considered to be 9.6mpa, because the concrete processing materials are not uniform. Necessary conversion should be carried out, so that the designed things will be safe. It's not safe to calculate everything
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