How much cement is needed per cube of concrete?

How much cement per cube of concrete will be required for construction work? This question is often asked by those who are planning in the foreseeable future to do construction or repair work. The basis of concrete are gravel or crushed stone, and as a connecting element is a mixture of sand and cement, mixed with water.

In order to prepare everything correctly, in addition to the production technology itself, you need to know how much cement is spent per concrete cube. This is important not only for calculating the required amount of materials, but also because strength will depend on it.

Factors

So let's consider what factors are important to consider:

First of all, you need to know that calculations are carried out with an accuracy of a kilogram, and in the case of crushed stone consumption - up to 5 kilograms.This is the only way to correctly calculate the basic properties: mobility, rigidity and strength. The smaller the consumption of the main binder, the more dense and reliable the final material will be.
In the calculations of great importance brand selection. The total material consumption will depend on it, which ultimately can make the final product cheaper or more expensive. The choice of grade should be based on the fact that the grade of the resulting concrete must be lower than the grade of cement used. So, for example, when preparing M100 concrete, you need to use M300 cement, while about 160-170 kilograms will be needed per cube. If you use cement M400, then its consumption will be large - about 180-195 kilograms.
Experts recommend in the manufacture of concrete measure components by proportions. Consider an example, 1: 5. This means that 1 part of cement accounts for 5 parts of sand. You can take any container and measure to it both the amount of cement and the amount of sand. Depending on the brand of cement calculation will vary. So, for the M600 brand, this ratio will be 1: 3, and for the M400, 1: 2.
After water is added to the mixture, the volume of the solution becomes smaller compared to the dry volume of the mixture.

Tables

The necessary data for the calculation are presented in the following tables.

Table of proportions of cement brand M400, sand, crushed stone for the manufacture of the required grade of concrete
Required grade of concrete	Proportions on weight, Ts: P: Shch (kilogamm)	Volume composition per 1 liter of cement, P: Sch (liters)	The resulting volume of concrete from 1 liter of cement
M100	1 : 4.6 : 7.0	4,1 : 6.1	7.8 l.
M150	1 : 3.5 : 5.7	3.2 : 5.0	6.4 liters
M200	1 : 2.8 : 4.8	2.5 : 4.2	5.4 liters
M250	1 : 2.1 : 3.9	1.9 : 3.4	4.3 l.
M300	1 : 1.9 : 3.7	1.7 : 3.2	4.1 liters
M400	1 : 1.2 : 2.7	1.1 : 2.4	3.1 liters
M450	1 : 1.1 : 2.5	1.0 : 2.2	2.9 l.

Table of proportions of cement grade M500, sand, crushed stone for the manufacture of the required grade of concrete
Required grade of concrete	Proportions on weight, Ts: P: Shch (kilogamm)	Volume composition per 1 liter of cement, P: Sch (liters)	The resulting volume of concrete from 1 liter of cement
M100	1 : 5.8 : 8.1	5,3 : 7.1	9.0 liters
M150	1 : 4.5 : 6.6	4.0 : 5.8	7.3 l.
M200	1 : 3.5 : 5.6	3.2 : 4.9	6.2 l.
M250	1 : 2.6 : 4.5	2.4 : 3.9	5.0 liters
M300	1 : 2.4 : 4.3	2.2 : 3.7	4.7 liters
M400	1 : 1.6 : 3.2	1.4 : 2.8	3.6 liters
M450	1 : 1.4 : 2.9	1.2 : 2.5	3.2 liters

Table of water consumption to obtain a given plasticity of concrete
Required ductility of concrete	Water consumption at the largest aggregate particle size (in l / cubic meter.)
	gravel, mm				crushed stone, mm
	10	20	40	80	10	20	40	80
Very plastic	215	200	185	170	230	215	200	185
Medium plastic	205	190	175	160	220	205	190	175
Maloplastic	195	180	165	150	210	195	180	165
Nonplastic	185	170	155	140	200	185	170	155

The most optimal variant in the ratio of sand and cement parts in the manufacture of a cube of concrete is 0.5 cubes of sand, 0.8 - rubble (gravel) and a certain part of the filler. The quantity will depend on the specific place of use.

For example, concrete M200, which is perfect for forming tracks and pouring the foundation, will require the use of 280 kg of cement. For concrete M300 will need more cement - about 380 kg.