The amount of cement per 1 cube of concrete - calculation in kilograms and bags

When purchasing building materials, it is important to accurately calculate their quantity. Both lack and excess do not bring joy. It is generally believed that "interception" is better than "undercoverage", but not in the case of cement. This material cannot be stored for a long time and therefore it is worthwhile to accurately calculate the required amount. How much cement is needed for 1 m³ of concrete can be determined in kilograms and bags. In principle, it is better to know both, because the packaging can be different.

How much cement is needed per cube of concrete

Cement is the type of building material that should not be stored for a long time. Even if it is kept warm and dry, after three months it loses 20% of its strength, after six months - 30%, and after a year - 50%. So for critical areas it is better not to use stale ones. To be sure of "freshness", it is better to purchase in the original packaging with the production date stamped on it. If you start it up right away, it can be two months old. If you also have it for a while, better fresh.

The quality of cement depends on the proportions

In order not to store, you need to know how much cement is in a cube of concrete. For this, there are tables that show the consumption of cement in kilograms per cubic meter of solution. The most popular are Portland cement grades M400 (new designation CEM I 32.5N) and M500 (new designation CEM I 42.5N). They are used to prepare concrete up to M500 grades. For less durable, you can use the cheaper M300.

Table of consumption of cement M400, M500 and M300 per 1 cube of concrete of different grades

Based on these data, it is easy to calculate how much cement is required for the amount of concrete you require. For example, 5.7 cubes are required for pouring the foundation. The concrete will be of the M300 brand, we will make it from PC400. One cubic meter is 290 kg. This means that 5.7 m³ * 290 kg / m³ = 1653 kg will go for everything.

The amount of cement per 1 m³ of concrete, depending on the hardness

Above is the average table. In general, the specific amount of binder depends on its quality, aggregates (sand and gravel), and also on the required stiffness of the concrete solution. In factories, a specific ratio is selected for each delivery of cement, sand or crushed stone. They brought another batch of sand - they are conducting tests. New binder arrived - all over again. In any case, it should be so. For meticulous house builders, we give a table in which the cement consumption per cubic meter of mortar is indicated, depending on the required rigidity (fluidity) of the composition.

How much cement is in a cube of concrete of different hardness

Also note that the use of additives that increase the workability of the mortar (fluidity) allows you to put less binder. But it is better not to reduce it "by eye". If you decide to add the same "Fairy", put the cement at the rate. The additive, by the way, too. Because with an excess, the concrete simply will not set and will be soft even after a month.

How many bags of cement in a cube of concrete

Cement is sold in bags and therefore it is better to know how many bags of cement per 1 cubic meter of concrete are required. There are also reference tables for this, but you can calculate it yourself. Counting is more accurate than using tables. First, there are bags of 40 kg and 50 kg. This is a standard container. But there are also 25 kg and such packaging is also a lot. The table shows how many bags of cement are in the concrete of the most popular brands.

How many bags of cement go to 1 cube of concrete

In addition, it is not enough when a whole number of bags is required per cubic meter. For example, concrete M150 needs 215 kg of PC400. Let's calculate the amount of binder in kilograms that will be needed to make 4.6 cubic meters of concrete. 4.6 m³ * 215 kg = 989 kg. Now we count the number of bags of cement that will need to be purchased:

• 25 kg each - 898 kg / 25 kg = 35.92 pcs. That is, you will need 36 pieces of 25 kg each;
• in a package of 40 kg: 898 kg / 40 kg = 22.45 pieces, round up, it turns out that you will need to buy 23 forty kilogram bags;
• 50 kg each - 898 kg / 50 kg = 17.96 pcs; bags of 50 kg need 18 pieces.

Now, how many bags of cement are needed for 1 m³ of concrete, we will calculate according to the second table. Let's take the same example - 4.6 cubic meters of concrete M150 from cement M400. According to the table, one cubic meter requires 4.3 bags of 50 kg and 5.4 bags of 40 kg. In total, the entire volume will go:

• 40 kg bags: 4.6 cubes * 5.4 pcs = 24.84 pcs or 25 bags.
• in packing of 50 kg: 4.6 cubes * 4.3 pieces = 19.78 pieces or 20 pieces.

The consumption of cement per cube of concrete is not so great, but the proportions must be strictly observed

The table does not indicate the number of 25 kg bags. You can calculate it yourself - you need to divide the number of 50 kg bags by 2.