How much mortar is required
We calculate the correct cement consumption
Cement is widely used in construction and finishing works. They connect bricks, aerated concrete blocks, plaster and screed with them. In any case, you need to carefully count the amount of materials you need. Since the construction workers have bought too little, they urgently need to buy additional cement, sand. If too much raw material is bought, you have to accept losses, organize storage, or find someone to sell the excess.
The cement consumption per cubic meter of masonry is determined by the composition of the mixture. The standard cement mix for joining building blocks requires the use of sand and water at the same time. Varying the proportions of the components is extremely rare, mainly the result obtained depends on the brand of binder used.
Usually around 1 cu. mThe solution uses 400 kg of dry cement, for 1 part of it you need to take 4 parts of sand.
1 m3 of ordinary brick can be laid at 0.25 - 0.3 cubic meters. In the mixture, the number of edible stones is approx. 400 pieces. It is necessary to take into account the working conditions. When laying in an environment with high humidity, the wall under the groundwater layer is arranged differently, the proportions of the mixture vary slightly. The outer walls mostly consist of a mixture of M10, which was made on the basis of cement M400.
Cement consumption is also determined by the thickness of the walls under construction. If you need to lay a brick of 1/4 brick, 1 m2 of it will require the use of 5 kg of cement (if you are preparing the M100 mortar), to make an M50 type mortar, you will need half as much glue. In this solution, the proportion of sand is typically 4 parts to 1 part of the binder component.
This ratio is based on the fact that there is the best balance between
- Fortress design;
- the agility of the mix;
- the rate of transformation of the solution into a solid material.
Other types of mixes
If kneading is carried out with the addition of additional substances (clay, limestone, marble, synthesized additives), it is assumed that 5 to 9 parts of sand are taken to 1 part of the cement. Concrete is made by adding a maximum of 5 quintals of binder for the production of 1 cubic meter can be used. M. Ready mix. The appropriate standards are prescribed in the state standard, but builders can deviate from the regulatory requirements if they need to reach a certain level of viscosity, make the solution more fluid, accelerate the solidification or keep it at a distance. At work, buckets and troughs (these are the most suitable containers), a perforator with mixing nozzles and shovels are used to distribute the portions.
Kneading is initially carried out on the basis of dry masses. Then add water systematically and slowly. It must be ensured that the masonry mortar is homogeneous towards the outside over the entire thickness and does not spread too much. The quality of the preparation of the mixture depends on the strength of the concrete and the life of the brick walls.
Sand-cement mortar is characterized by high strength. But if you deviate from the standard technology a little, cracks can appear. In the mixed version, slaked lime is added to the cement and sand (also called lime milk).
There is also a type with plasticizing additives, if in addition to the cement and sand fraction, 0.2 cm of polymers are used, which make the solution more flexible, there is no need to worry about the preparation of such solutions: it is better to use ready-made dry kits and dilute them with water as directed.
Regardless of what type of mixture is prepared, it is necessary to check that there is not a single lump in the dry matter.
The sand is passed through a sieve, the lime must be drained. If there is a need to add lime, then it is injected only after mixing powdered substances, which pour out in small portions. The temperature of the liquid should be about 20 degrees, the mixture is mixed, otherwise the composition will quickly settle. Reduce the time of preparing the solution in order to save energy, concrete mixer or perforator will help.
The standard consumption rate for 1m3 or 1000 bricks can serve as a guide to purchase, but you also need to take into account the professionalism of the craftsmen and the type of blocks used (if the products are empty or porous, more solution will be needed). A smaller absorption is in the mix for the hyperpressed and facing bricks rather than a simple ceramic material.
Mix consumption per 1 cu. m. (based on the typical thickness of the seams) is 0.23 cubic meters. m average. If the thickness of the walls is half the brick, then 0.221 m3 of cement mixture will be needed for simply decorated surfaces made of ceramic material.
The consumption of the finished mixture per 1 m2 of a brick wall can vary depending on the quality of the resources used, the microclimate and weather conditions. This number can also vary slightly on different floors.
In a bucket for 10 liters can put 14 kg of cement, for sand, the same indicator (10 liters) will be 2 kg less. The ratio of M400 brand sand and cement is usually 3: 1, and if you take the M500 binder, then 4: 1. On a hot summer day, the solution should be made less thick, the plasticity being improved by introducing small amounts of detergent or dish washing is increased. One cubic meter of ready-to-use cement slurry made in a ratio of 1: 4 requires the use of 4.1 centimeters of cement grade M500 and 1.14 cubic meters. M. Sand.
Since 1 m3 of wall thickness of a silicate brick with the dimensions 25x12x6.5 cm consumes 0.24 cubic meters. m, the consumption of cement mortar per m3 is calculated by multiplying the specific consumption by 410. A total of 98 kg of cement is obtained. If you use an M400 binder in a ratio of 1: 3 per 1 cu. m) The mixture requires 4.9 quintals of cement. At 1 cu. m masonry requires 117 kg of the original component.
Cement-lime mortars retain their qualities for no more than five hours. In summer, when the air is heated to +25 ° C, this time is reduced to 1 hour.
When carrying out the facade work, the approach changes. It is necessary to calculate the consumption of binding mixtures per 1 m2 of wall (not per cubic meter).
The actual value is determined by:
- the propensity of building materials to absorb water;
- Weather conditions;
- the number of internal cavities.
The norms prescribed in SNiP 82-02 always turn out to be small in practice, so when buying mortar or dry cement it is necessary to take a small reserve. The most economical material in this plan is a double brick (ceramic or silicate), which must necessarily have high strength. This makes it possible to save up to 1/5 of the entire mixture.
Tips and Tricks
In the overwhelming majority of cases, construction workers use the M75 cement-sand mix mortars to get it on the 300th row Portland cement base. It is necessary to divide one part of the binder with three parts of sand, it is necessary to use compositions of M100 and stronger only for buildings with increased strength properties. When calculating the cement mass for partitions, you need to pay attention not only to the width of the seam, but also to the orientation of a particular layer.
If a brick building is light and not too important (we are talking about household and ancillary facilities), then it is acceptable to reduce the cement concentration to 15-20% based on the total mass of the mixture.
The geometry and volume of each individual block do not have to be taken into account. Such calculations are very difficult for non-experts, and the savings in bulk do not justify the effort. It is enough to use the average values obtained in long-term design practice to make changes to a particular situation.
See the video for the rules and secrets for mixing the solution.
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