Houses built of aerated concrete are characterized by reliability and durability. Strength and other operational parameters of the building largely depend not only on the quality of the blocks, but also on what glue and in what quantity was used for masonry. The choice of mixtures for joining aerated concrete products is huge today, but a good product is not cheap.
Agree, it is better to know in advance how much glue will be spent on the construction of an aerated concrete building. Then you will not have problems due to the fact that the mixture is purchased more or less than necessary. Determine the glue consumption for aerated concrete blocks per 1m3 really easy. You need to know some features and nuances.
In this article we will tell you why it is so important to be able to calculate the optimal amount of glue, we give a formula by which you can easily understand how many bags of the mixture you need. We also list and consider the factors on which the size of the adhesive composition depends. We will give advice on the selection and preparation of adhesive for laying gas blocks.
Why do I need to know the glue consumption?
In the construction of houses made of aerated concrete are more economical than brick structures. This is due not only to the cheapness of the blocks, but also to the fact that special glue is used as a bonding element.
It costs 1.5-2 times more expensive than cement-concrete mortar, which is used for bricklaying. But at the same time, its consumption is six times lower. The result is good savings. But, unfortunately, not everyone knows how to determine how much adhesive composition will go into masonry. This leads to a number of problems.
Glue for laying aerated concrete blocks does not give strong shrinkage, and also eliminates the appearance of places with increased heat conductivity, provides a more durable and durable joint
The advantages of having the knowledge and skills to accurately calculate the right amount of glue for building a house from gas blocks are obvious.
Firstly, it is an opportunity to save financial resources. If the flow rate is correctly determined, then there should not be any extra bags of glue after the completion of construction work. Accordingly, there will be no overpayment.
Secondly, situations when glue is over and it is necessary to buy it are excluded. In the store in which the mixture was previously purchased, the brand may not be needed. Then it will be necessary either to choose the glue of another company, which is not welcomed by specialists, or to look for the necessary product in another place, or to wait for the delivery of the required brand. In the latter case, it will be necessary to suspend construction for a while. If the glue is correctly calculated in advance, then such troubles can be avoided.
Thirdly, you can check the estimates made by experts. Some construction firms are unscrupulous and intentionally inflate costs.
Fourth, knowing the features of the calculation, it will be possible to dilute the amount of dry adhesive that is currently needed to lay a certain number of aerated concrete blocks.
Glue for gas blocks is prepared by combining dry matter with water. The mixture is not stored for a long time: it should be used within 2.5-3 hours
If during construction of the building much more or less glue was taken from the aerated concrete from the planned volume, this indicates that either the mixture was calculated incorrectly or significant errors were made during the construction of the structure, for example, incorrect installation technology was used.
Settlement Procedure
Aerated concrete blocks are distinguished by precise geometry.Due to this, they can be laid on a thin layer of a binder mixture. When determining the flow rate of glue, you need to adhere to a special algorithm.
Calculation Procedure:
- Calculate how many aerated concrete blocks are needed to build a building.
- Assess the evenness of the surface of the products, prepare them for masonry.
- Decide on the thickness of the seam.
- Read the glue instructions. Pay attention to breeding, consumption. Similar information is provided on the back of the bag.
- Calculate the required amount of adhesive dry matter.
Standard adhesive consumption for aerated concrete per 1 m3 varies from 15 to 30 kg of dry weight. With a layer thickness of 1 mm, about 25 kg of mixture per cubic meter is required. This is one bag of makeup.
Similar proportions are characteristic for blocks with a flat surface, without visible deformations. One bag of glue is recommended to be taken in reserve. For example, if you bought 20 cubic meters of aerated concrete blocks, then for their masonry you will need 21 bags of adhesive.
Seams between aerated concrete blocks make from 1 mm. An optimum layer of glue is 2-3 mm. For comparison, the thickness of the cement-concrete mortar for reliable fixation of bricks according to the standards should be at least 10 mm
It’s not always possible to buy a batch of ideal blocks. Therefore, in practice, the glue consumption can be 1.5 bags per 1 m3. All these figures are approximate and depend on various factors.
For an accurate calculation of glue consumption, it is worth using the following formula: ((L + H) / (L × H)) × d × 1.4
P is the glue consumption in kilograms per cubic meter;
L, H - the length and height of the aerated concrete block, respectively (in meters);
d is the thickness of the seam;
1.4 - the value of the flow rate of the dry adhesive mixture, provided that the layer thickness is 1 mm
Today, there are many specialized resources on which you can determine the glue consumption using an online calculator. This tool takes into account various factors that can affect the volume of the composition for bonding blocks.
But for maximum accuracy, all calculations are best done manually. In this case, it is necessary to take into account the dimensions of door and window openings, pediments of the building. When filling out the form, it is important to be as careful as possible. Carrying out the calculations, one must carefully operate with the units of measurement, otherwise there is a risk of serious errors in the calculations.
Features of calculating the consumption of glue
The amount of glue required for bonding aerated concrete blocks is calculated in kilograms per square or cubic meter.
When buying bags of glue for laying aerated concrete blocks, it is important to pay attention to the shelf life of the goods. If the composition is expired, then its bonding properties will be worse
To achieve the desired result and get a high-quality, reliable seam, you must observe all the proportions when diluting dry matter, follow the recommendations of specialists. Do not try to save money by adding more water to the adhesive mixture than indicated in the instructions. This reduces adhesion.
It is also not recommended to make the seam thinner than necessary to minimize consumption - this will worsen the quality of block bonding.
When determining the amount of glue consumption, some features must be taken into account. The consumption declared by the manufacturer may be lower or higher than the actual. This is due to the influence on the result of a number of additional factors.
What determines the consumption of glue?
With large volumes of work, it is quite difficult to determine how much glue is required for laying aerated concrete blocks. It happens that for one cubic meter it takes not 25 kg of glue, as planned, but 30-40 kg or 14-15 kg.
In order to obtain consumption data that is as close as possible to the real ones, it is worth taking into account the influence of a number of factors.
Use used blocks is not worth it. Their price is much lower than new products. But they have significant defects. To make a smooth masonry and build a durable house, you will need a lot of glue
The glue mass required for laying aerated concrete blocks depends on the quality of the product. The cheaper the mixture, the worse its composition. It may contain too much sand and other excess fillers.
This adversely affects bonding properties. Accordingly, the consumption of such glue will be high. If the bulk is a binder, then the mixture will be used more economically.
The geometry of the blocks has a great influence. The smoother the surface of aerated concrete products, the thinner you can make a layer of adhesive for masonry. This will maximize savings. The presence of defects, on the contrary, requires the use of a larger amount of adhesive to eliminate them.
A certain role is played by the masonry technique and the level of skill of the builder. Inexperienced workers often make mistakes and spend too much staff to correct them. The quality of the result from this does not increase, but the consumption of glue increases.
The consumption of the mixture largely depends on the seam of what thickness the master will make. The higher this figure, the more glue will be spent on building a house.
Another factor is the presence of a reinforcing layer. Often, when creating aerated concrete walls for two-story and higher houses, builders conduct reinforcement. Then the blocks have to apply a thicker layer of glue. This increases material consumption.
To erect a gas-concrete house in the rain is not worth it. Water will enter the blocks and the container with glue. This will reduce the quality of construction.
Also, the consumption of the composition largely depends on the temperature regime, weather conditions. The hotter it is on the street or in the room where the wall is being erected, the more glue will be consumed. This is because the evaporation of the mixture increases.
Approximate glue consumption in different cases
It is important to consider all the nuances when calculating the amount of glue consumption for laying aerated concrete blocks. This will allow you to determine as accurately as possible how many kilograms of dry mix will need to be purchased for the construction of the house.
The table below shows the consumption of glue depending on the thickness of the seam and grade of composition.
Adhesive Grade | Seam thickness, mm | Glue consumption in kg per 1 m3 |
AEROC | 1 | 20 |
Ceresit ST 21 | 2 | 52 |
Ytong | 2 | 60 |
UDK | 1 | 25 |
Kreisel 125 | 2 | 50 |
Baumit PorenbetonKleber | 2 | 60 |
The approximate glue consumption depending on the thickness and density of aerated concrete blocks is given in the following table.
Block thickness in cm | The density of aerated concrete blocks in kg / cubic meter | Glue consumption in kg per cubic meter |
10 | 300-400 | 19,3-19,4 |
15 | 300-400 | 19,9-21,0 |
20 | 300-400 | 16,4-16,8 |
25 | 300-400 | 15,9-16,2 |
30 | 300-400 | 15,5-15,8 |
37,5 | 300-400 | 15,1-15,4 |
40 | 300-400 | 14,9-15,1 |
These flow rates are relevant for those cases when the thickness of the adhesive layer does not exceed 1-2 mm, and the blocks do not have significant defects in terms of geometry.
Secrets of economical consumption
If you adhere to some expert advice, then spending adhesive on laying aerated concrete will be more economical.
Experienced master builders know how to work with aerated concrete, glue. Therefore, they build a house faster and more economically in terms of material consumption. When constructing a building from gas blocks on your own, you need to be careful and carefully think through everything, do not rush
The use of special tools speeds up the construction process and allows you to minimize the use of glue, and, accordingly, reduce the cost of work. It is recommended to use a ladle, a rubber mallet, a square, a grater with a sandpaper, and a saw for masonry.
Glue should be applied with a spatula or a special spatula. Then the composition will lie down more evenly and it will turn out to minimize its consumption. Before laying, the blocks must be cleaned of dirt. It is important to dry them well so that they are not wet.
Adhesive Mixing Tips
The range of adhesive for laying aerated concrete on the market is quite extensive. All compositions are divided into gray and white. The first are considered universal. They can be used at any time of the year. They contain additives that increase frost resistance. Such glue has certain temperature limits of use.
White compounds are suitable for work in the warm season. They contain Portland cement. This substance also gives the mixture a light shade. White glue should be used for laying blocks indoors. The seam is aesthetic and does not require additional processing.
Usually for the construction of aerated concrete houses use a gray type of glue. This is because such a composition is universal and more common on sale
Adhesives for gas blocks of such companies are very popular: Ceresit, Kreisel, UDK, Ytong, Real. New products appear regularly on sale. Therefore, not all builders can comment on the quality of a particular brand of glue. A little-known mixture for laying gas blocks can be no worse in quality than branded products.
Due to the fact that the range of adhesives for aerated concrete blocks is wide, many have problems with a choice. The question of what glue is best suited for building a house is quite relevant. There are different ways to understand which mixture is worth using.
Experts advise to pay attention to the composition. It should have a lot of binders and a minimum concentration of additional inclusions that are used to reduce the cost of production. Making a choice is worth testing and comparing.
Builders recommend purchasing 2-3 types of glue in an amount of up to 1 kg and checking their quality in practice. Prepare the solution in accordance with the manufacturer's instructions. Then glue each mixture in two blocks. Leave to freeze for a day. After a day, try to break the structure in the seam area.
To buy glue for laying gas blocks should be in reliable companies. It is better to choose well-known and proven brands. This guarantees a high quality mix.
The result will show how good the glue was used. If the fault location coincides with the seam, then this mixture is better not to use. If only the aerated concrete block was damaged, then this indicates a high quality of glue. A similar composition can be safely applied to any type of work.
If the fault partially touched the seam, this means that the adhesive mixture will not provide sufficient structural strength, therefore it is better not to use it, especially when building multi-storey buildings.
Another way to determine the quality and choice of glue is to check its weight after solidification. It is necessary to buy several types of adhesive compositions for the sample and pour them in equal quantities into containers of the same size.
Wait a day and evaluate the result. To do this, weigh each of the tar. Preference should be given to that glue, the weight of which after solidification has decreased the most. This suggests that it took a lot of moisture and the composition became more durable.
If you bought glue of an unknown brand, then it is better not to start building a house with it before quality control. Correcting the situation will then be more difficult
Testing the glue in the above ways is troublesome, time-consuming, time-consuming, and expensive. But such a check will help to accurately assess the quality of the composition. After all, the promises of manufacturers are not always true.
Testing makes sense when planning large-scale construction. This will help not only check the quality of the glue, but also more accurately calculate its consumption.
How to save glue when laying gas blocks:
Testing different types of glue for strength:
It is not difficult to determine the consumption of glue for laying masonry blocks from aerated concrete. It is necessary to use the formula and take into account all the factors that may affect this indicator.
If you have doubts about the independent accurate calculation of the size of the adhesive, it is better to consult an experienced specialist. He will tell you how much the mixture will take and how best to masonry for maximum savings.
If you have experience determining the consumption of glue for the construction of aerated concrete structures, you can advise a quality composition, then share this useful information. Leave your comments using the special form below.