Cement is widely used in construction and finishing works. With it, they connect bricks, aerated concrete blocks, prepare plaster and tie. Each specific case is forced to carefully calculate the number of necessary materials. Having bought them too little, builders are forced to urgently acquire additional cement, sand. If too many raw materials are purchased, you will have to come to terms with his loss, organize storage or search for someone to sell surplus.
Cement consumption on brickwork cube is determined by the composition of the mixture. Standard cement cheese for connecting construction blocks implies simultaneous use of sand and water. Various the proportions of the components are extremely rare, mostly achievable result depends on the brand of the used binder substance.
Usually for obtaining 1 cube. M. The solution uses 400 kg of dry cement, on 1 of its part you need to take 4 parts of the sand.
1M3 ordinary bricks can be laid using 0.25 – 0.3 cubic meters. M. Mixtures, the amount of consumable brick is approximately 400 pieces. It is necessary to take into account the conditions for performing the work. Ground masonry in the setting of high humidity, installation of the wall below the layer of groundwater differ, the proportions of the mixture change slightly. The outer walls are most often made from the M10 mixture created on the basis of cement M400.
Cement consumption is also determined by the thickness of the walls under construction. If you need to make a laying in 1/4 brick, 1 m2 will require it to use 5 kg of cement (when the M100 brand solution is prepared), for the preparation of a m50 solution, you need half a smaller binder. In this solution, the proportion of sand is typical 4 parts on 1 part of the binder component.
This ratio is due to the fact that it allows you to achieve the best balance between:
- fortress design;
- mobility of the mixture;
- The speed of conversion of the solution into solid material.
Other types of mixtures
When the knees are carried out with the addition of additional substances (clay, lime rocks, marble, synthesized additives), for 1 part of the cement it is supposed to take from 5 to 9 parts of sand. Concrete do, spending a maximum of 5 centners of a binder for obtaining 1 cube. M. finished mixes. The relevant norms are prescribed by the state standard, but builders can retreat from regulatory requirements if it is necessary to achieve a certain level of viscosity, make a solution more liquid, accelerate or remove frost. When working, use buckets and troughs (these are the most suitable containers), perforator with mixing nozzles, shovels for dividing portions.
The knees are carried out initially on the basis of dry mass. Then water systemally and slowly add water. It is necessary to achieve that the masonry solution becomes externally homogeneous in the thicker and did not grow too active. From the quality of the preparation of the mixture depends on the fortress of concrete and the duration of the service of brick walls.
For sand-cement mortar, high strength is characterized. However, if you retreat a few standard technology, cracks may appear. In a mixed version, harated lime add to cement and sand (otherwise called lime milk).
There is still a type with plasticizing additives, when, in addition to cement and sand fraction, 0.2 cm uses polymers that make a solution more flexible. Take care of the preparation of such solutions is not necessary: it is better to buy ready-made dry sets and dilute them with water as the instruction is.
No matter which mixture is preparing, you need to check that there is no single lump in the dry mass.
Sand passes through a sieve, the lime needs to be strain. If it is necessary to add lime, it is administered only after mixing powdered substances, pouring insignificant portions. The temperature of the fluid should be approximately 20 degrees, the mixture is stirred, otherwise the composition will quickly grab. Reduced the time for the preparation of the solution, to save the forces will help the concrete mixer or perforator.
Costs of binder
The standard flow rate of 1 m3 or 1000 bricks can serve as a guide when buying, but it is also necessary to take into account the professionalism of the masters and the type of blocks used (if products are empty or porous, the solution will be needed more). Little absorption is inherent in the mixture for hyperpressive and facial bricks than simple ceramic material.
Mix consumption for 1 cube. M. (based on typical seam thickness) is 0.23 cubic meters. M. average. With the thickness of the walls in half bricks for simply decorated surfaces from a ceramic material, it will be necessary to use 0.221 m3 cement kneading.
Consumption of the finished mixture for 1 m2 walls of bricks may vary, according to the quality of the resources used, microclimate and weather conditions. Even on different floors, this quantity can be a bit, but vary.
In a bucket, designed for 10 liters, one can accommodate 14 kg of cement, for sand on the same indicator (10 liters) will leave 2 kg less. The ratio of sand and cement M400 is usually 3: 1, and if you take the binding composition M500, then 4: 1. On a hot summer day, a solution must be done less thick, the increase in plasticity is achieved by the introduction of small portions of the washing powder or composition for washing dishes. The cubic meter of the finished cement mortar made in the ratio of 1: 4, requires 4.1 centner cement cement M500 and 1.14 cube. M. sand.
Since 1 m3 walls thick in one silicate brick dimensions 25x12x6.5 cm is consumed 0.24 cubic. m, the consumption of cement mortar on M3 is calculated by multiplying the specific consumption for 410. Total is 98 kg of cement. If you use a binder M400, in proportion 1: 3, per 1 cubic meter. M. Mixtures will need 4.9 centner cement. Per 1 cubic. M. Brickwork need 117 kg of source component.
Cement-lime solutions retain their qualities no more than five hours. In the summer, when the air is warmed up to +25, this term decreases to 1 hour.
Consumption with cladding
When performing facing works, the approach changes. It is necessary to calculate the consumption of binding mixes on 1m2 walls (not on the cubic meter).
The real value is determined:
- the tendency of building materials to the absorption of water;
- weather conditions of work;
- The number of inland cavities.
Canditated in SNiP 82-02 norms in practice are always small, because when buying it is necessary to take a solution or dry cement with a small reserve. The most economical material in this plan turns out to be double brick (ceramic or silicate), which must necessarily have high strength. As a result, it is possible to save to 1/5 of the whole mixture.
Tips and recommendations
In the overwhelming majority of cases, builders use the solutions of the cement-sand mixture category M75 to get it based on Portland cement 300th series. It is required to breed one part of the binding three parts of the sand. Use the compositions of M100 and more stronger only for buildings with increased strength characteristics. When calculating the mass of cement going on the execution of partitions, it is necessary to pay attention not only to the width of the seam, but on how much the concrete layer is.
If the brick construction is light and not too important (we are talking about economic and utility facilities), it is permissible to reduce the concentration of cement to 15-20% relative to the total weight of the mixture.
No need to take into account the geometry and the volume of each individual block. Such calculations are very complex for non-professional, and savings by weight do not meet the efforts. It is enough to use the average numbers obtained in many years of construction practice, amend the specific situation.
Rules and secrets of the kneading solution See in the video.