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August 12, 2017 18:06

Determine cement consumption per cubic meter of concrete

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construction of any house begins with the foundation.If you decide to build it on their own, without the involvement of specialists, then before you certainly will be a question, what is the cement consumption per cubic meter of concrete.The unequivocal answer to this question does not exist, as well as concrete, and its main binder - cement have different characteristics depending on the brand.Try to understand the wisdom of building.

cement consumption per cubic meter of concrete

cement consumption per cubic meter of concrete

What is the grade of concrete

concrete brand, for example, M200 - a measure of its strength in compression.Measured by this indicator on concrete cube with a side of 20 mm after 28 days drying under normal conditions.For a variety of designs on the conditions of their operation requires concrete of different brands, for a private residential building, usually used concrete M100-M300.

plasticity of concrete

Concrete is known, it consists not only of cement and water - such a solution is very fragile and to perform building structures is not necessary.Addition of cement and water into concrete fillers include sand and gravel.They also must meet certain requirements, such as particle size and to the amount of impurities.

Depending on the amount of filler and water in the concrete solution texture may be different from the cast - liquid, flowing with a trowel or shovel to non-plastic, shovel standing on the hill without spreading.To run the foundation, floor or blind area with a normal amount of reinforcement is most often used sredneplastichny concrete - it slides with shovels, inclined at an angle 45 °, not spreading at the same time.

Cement, selection and storage conditions

Cement, like concrete, can be different brands of cement depends on the brand of its binding capacity.For a solution with the desired characteristics required of cement with the brand, 1.5-2.5 times the concrete brand: for example, to take concrete M200 M400 grade cement.

Cement in storage loses its properties, even if seemingly looks dry.Therefore fly better cement shortly before construction, and in the case of using the old cement is necessary to increase the dose in solution.

Fillers for concrete

mandatory component in concrete - sand.For the preparation of solutions used sand with a grain size of 1.1 to 3.5 mm.More than fine sand, reminiscent of dust, of little use for the preparation of concrete.It is also not suitable for solution sands, contaminated silt, clay, organic residues - grass roots.Sand as filler creates krupinchatuyu structure, facilitating adhesion to the concrete reinforcement, which enhances the structural strength at break.

Sand is an excellent filler for concrete

Sand excellent filler for concrete

addition of sand, in the concrete composition includes gravel, crushed stone or expanded clay.Depending on the excipient solutions may be heavy and light.Granite crushed stone heavier solution, lightweight filler - expanded clay, slag or tuff - used for the preparation of light mortars.Gravel particle size in the solution must not exceed ¼ thickness of the thinnest portion of the structure.For example, for the foundation slab of 10 cm thick gravel required in the composition of concrete with a particle size of not more than 25 mm.

Crushed aggregate for concrete

Crushed as a filler for concrete

Water - another necessary component of concrete.To prepare the solution use cold or slightly warmed in the cold season, clean water of drinking quality.Tap water is perfectly suitable for the preparation of concrete.Water from rivers - only if it does not contain residues of vegetation and other organics.You also can not use a solution of water contaminated with chemicals, oils and solvents.

Water is a necessary component for concrete

Water is a necessary component for concrete

composition of the solution and cement calculation of cubic concrete

composition dry mixture is calculated by weight.For foundations and other concrete structures used in low-rise buildings, typically use a weight ratio of cement, sand and gravel of 1: 4: 4.This means that the charge for solution 1 part cement and four parts sand and 4 parts of crushed stone or gravel.

calculated in accordance with the table index of water-cement ratio (CC).Use a table based on the desired grade of concrete and hardening period, as well as the cement used.This figure indicates the amount of water, referred to the weight of cement required.The following table shows the data for the concrete with heavy gravel, using building rubble to the indicator should be added to 0.05.

For example, you need a concrete grade 250 concrete maturation period under the terms of the construction - 28 days.You are using a cement brand M400 and building rubble.On the table are the W / C for the given conditions: 0.56.As for the concrete rubble is used, is added to the index 0.05 and 0.61 is obtained.

The term curing various types of cement

term hardening of various grades of cement

next indicator - the amount of water in the concrete, calculated on the basis of the necessary plasticity of the solution and the type and particle size of the filler used.For example, for sredneplastichnogo concrete rubble having a particle size of 20 mm in this figure will be 205 liters.

Table to create the required concrete strength

Table to create the required concrete strength

last stage of the calculation - determining the amount of concrete components.To find the required amount of cement in the concrete cube, you need to divide the rate of water in the concrete on the water-cement ratio in VC:

C = V / VC = 205 / 0.61 = 336 kg cement.

number of remaining components is calculated from the predetermined ratio of 1: 4: 4.Thus, for a cubic meter of concrete sredneplastichnogo M250, M400 are made from cement with the use of building rubble with a grain size of 20 mm is necessary: ​​

  • cement - 336 kg;
  • Sand - 1344 kg;
  • Rubble - 1344 kg;
  • water - 205 liters.

To make it easier to determine the weight of the components, you can use the usual desyatilitrovym bucket.The bucket contains:

  • 13-15 kg of cement;
  • 14-17 kg of sand;
  • 15-17 kg of rubble.

For the most common grades of concrete with a weight ratio of 1: 4: 4 can use the table.

Fillers for various grades of concrete

Fillers for various grades of concrete

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