Many people are interested in the question of the correct technology of mixing concrete in a concrete mixer, despite the fact that the process at the first impression may seem simple enough. In fact, the complexity of the process is to prevent overconsumption of the constituent materials and not to spoil expensive equipment.
Table of proportions of the components of concrete when using cement brand M400.
Kneading concrete components
No large-scale construction is complete without the use of such a strong composition as concrete. This is especially true for supporting structures (pillars, foundations, etc.). In addition, it is impossible to do without concrete and with less large-scale construction work, where in most cases mechanical methods for mortar kneading are not required - the process is done by hand. Concrete kneading in large quantities, for example, when floor screeds are created, foundations or building blocks are made, is performed using a concrete mixer. The usual capacity and trowel for such purposes, as you understand, is not enough.
The scheme of preparation of concrete mix.
The main components of the solution do not change, no matter how much you need. The building mixture consists of cement, sand, rubble and water. Depending on the amount of concrete you will knead, it is necessary to keep certain proportions of the components. Stability, strength, mobility and many other parameters of concrete are directly dependent on the ratio of materials. Very often, experts, in addition to the main components, add various additives to the solution, designed to increase the resistance of concrete to frost, accelerating the process of drying, etc.
The concrete kneading at home is very often performed according to the following proportions: a couple of weight parts of cement, 4 - sand, 8 - rubble and 1 - water. So you get a solution that has an average strength. It is quite possible to apply both to perform volume work, and less significant. The quality of the solution is greatly influenced by the brand of cement that you used to make. In order to determine how durable it is, pay attention to the letter “M” and the numbers indicated near it. The higher the numbers, the greater the strength.Back to table of contents
How to mix concrete in a concrete mixer and what features should I pay attention to?
Scheme for determining the plasticity of a concrete solution.
Before you knead the concrete in a specially designed mechanism, it does not hurt to learn about the principle of its work. The mixer has a fairly simple device. The difference between machines is only in the methods of mixing, i.e. in active parts. If you look at the device of a concrete mixer, it can be noted that its main components are:
- the basis made of strong material which in horizontal position is established on a surface;
- inclined axis for installation of the tank for mixes;
- screw having blades for mixing;
- hole to drain.
How to mix concrete in a concrete mixer will depend on how it combines the components of the mortar. Mechanisms are gravitational and forced. The first option is a rotating drum with a stationary screw, the gravitational mechanism mixes concrete with the help of moving blades (the drum remains in place).
Despite the fact that the dimensions of the enforcement mechanism significantly exceed the gravitational device, the demand for it is greater. The fact is that the mixture made with its use is distinguished by its homogeneous consistency. The use of gravity concrete mixers can often be found in private buildings. Their advantages include such qualities as easy transportation, compactness, many options that allow you to choose the volume in which you are going to knead the solution.Back to table of contents
How to make concrete in the mixer with their own hands: the process steps
Scheme of concrete heating.
If you decide to knead the concrete in a concrete mixer yourself, you will definitely need some subtleties and recommendations of this process. In order that the quality of the prepared solution does not disappoint you, the work should be divided into several main stages and consider each of them separately. With the right approach, it is possible to mix concrete in a relatively short period of time.
The list of basic materials and tools for mixing concrete in a concrete mixer:
- concrete mixer;
- building level;
How to mix concrete: concrete mixer and its installation
Diagram of the device concrete mixer.
The mechanism is installed on a flat surface. Compliance with this condition is necessary so that the apparatus can knead the solution evenly. The uneven position of the mechanism can not only lead to the mixing of concrete with crumpled components, but also to the rapid failure of the mechanism. The reason for this, as a rule, is the improper distribution of the blades, which are in the drum, which, respectively, leads to their uneven wear. You can not waste time searching for a perfectly flat surface, because it is quite difficult, dense objects placed under the mixer can be a way out of the situation (wooden bars are perfect for this purpose). Using the construction level check the result of the installation mechanism.Back to table of contents
The stage of loading the components of the solution materials
There are no special recommendations for loading components into a concrete mixer, however, if you are determined to mix concrete of good quality, some subtleties should be taken into account at this stage of work. The loading of the components of the solution is performed in the following order:
- Crushed stone
The design of a manual concrete mixer from the barrel.
Acting in this way, you will avoid such troubles as damage to the inner drum cover by rubble. As is known, in order to knead the solution, first of all, the dry components are mixed, and afterwards the composition is filled with water. By the same principle, the concrete must be kneaded in a concrete mixer.
Before kneading concrete, it should be noted that the first mixing is carried out with proportions of materials such as cement and sand increased by 10%. The fact is that they belong to dry and light enough components, which contributes to their sticking to screw cavities, respectively, their content in concrete will be lower. Next, you can knead the concrete according to the specified scheme. Many experts, foreseeing a similar property of mixing a mortar in a concrete mixer, lubricate the screw with used technical oil, which helps protect it from sticking of the solution.Back to table of contents
How to knead the concrete?
Scheme fillers for concrete mix.
In order to knead the concrete, it is not necessary to observe any special rules. But it will not be superfluous to pay attention to several features of this process. First of all it is necessary to take into account that it is not necessary to mix concrete for a long time in a concrete mixer. This can lead to a gradual evaporation of water, which directly affects the plasticity and obedience of the solution. As a result, working with such a composition can take a lot of time and nerves.
In this regard, it is necessary to knead the concrete for the most optimal time for this, as a rule, several minutes are enough for that. After that, you need to check how ready the composition is, a small amount of concrete is taken from the drum.
Back to table of contents
For the finished solution such external qualities as homogeneous consistency, even color and rigidity are typical (the composition should not spread over the surface).
The stage of unloading the solution from the concrete mixer and its cleaning
Having kneaded concrete in a concrete mixer, the full amount of structure needs to be merged at once. To do this, you can use a container of suitable size. Otherwise, the remaining solution in the drum may delaminate (heavy material will settle to the bottom).
In addition, it is very important that the drum blades are as thoroughly as possible cleared of the remnants of the concrete composition. Having finished kneading the concrete completely, rinse all the components of the mixer (blades, drum and drain holes) thoroughly.