Is it possible to cut concrete with a grinder?

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Using a grinder when cutting concrete

Today it is difficult to imagine doing the work of mechanics or builders, repairmen and other similar professions without an angle grinder. It is actively used when cutting, trimming and grinding various materials.

As the number of attachments increases, its functions become more diverse. The article suggests getting to know how concrete is cut with a grinder and its features.

Features of cutting with a grinder

Cutting concrete along a line

Making a casing for a vacuum cleaner

Cutting concrete without dust: how to cut with a grinder with your own hands, tool

Cutting concrete without dust is practically impossible, since in the process of sawing and processing stone one way or another a lot of dust appears, the volume of which can only be reduced.
But it is also advisable to do this, since too much dust during the work process causes many troubles: it spoils the tool and dulls the parts, settles in the lungs and on all surfaces in the room. With the use of modern equipment, sawing concrete has become easier - there are special cutting tools and consumables for them. The devices can be manual or stationary, powered by electricity or other sources. As a rule, all tools for cutting concrete are equipped with diamond parts - chains, discs, crowns, brazed tips, etc.

Is there a technology for cutting concrete without noise and dust?

When thinking about how to cut concrete, you need to take care of reducing the amount of dust that inevitably appears during the work process. In certain cases, nothing can be done and you have to work in difficult conditions, but in others it is quite possible to remove dust. The main thing is not to violate safety requirements and use proven methods.

Concrete cutting is a targeted mechanical impact on a monolith using rotating parts of a tool. Cutting is not accompanied by impact noise, but always involves noise from the electric motor driving the tool and the operation of its moving parts, which cut a groove in the stone or cut reinforcement, cut into pieces, etc.

Different methods are used for cutting concrete - manual, machine, wet and dry. The first two are determined by the type of tool chosen; the wet method involves the action of water on the cutting part and on the concrete surface itself; the dry method does not use water supply. Regardless of the cutting method chosen, the amount of dust accompanying the process is always quite large.

The most common methods for cutting concrete are:

Diamond cutting of partitions and walls with hand tools (grinder and others).
Diamond cutting using a stationary wall saw.
Diamond cutting with seam cutters.
Used for cutting rope.

When using a hand tool (most often a grinder), you can connect a construction vacuum cleaner to it, which will suck in almost all the dust that appears during the cutting process. If there is no way to connect the tool to a vacuum cleaner, you can do everything yourself.

What you will need to create an adapter for a construction vacuum cleaner:

Sewage outlet made of polypropylene with a diameter of 50 millimeters, at 45 degrees.
Reinforced tape (more reliable).
High quality masking tape.

The process of creating a vacuum cleaner attachment for dust removal:

Place the grinder as stably as possible on the table or floor so that it lies upside down parallel to the plane of the base.
Take the outlet with pliers or a clamp, turn on the grinder and “cut” the pipe along the body, 3 centimeters under the tool casing.
Using reinforced tape, tape the outlet very tightly and tightly to the body of the angle grinder, going slightly into the saw blade (a few centimeters). The fixation of the pipe must be reliable so that it is attached motionlessly.
Cover the open side of the casing with masking tape, thus connecting it to the outlet. Then you can connect a construction vacuum cleaner and remove dust while working.

This system does not imply any design changes in the tool, but before using it, it is advisable to consult with a representative of the manufacturer about the possibility of making modifications.

Cutting concrete with hand tools

Due to the strength of the material, not any hand tool is suitable for working with it. Most often, an angle grinder (also called an angle grinder or grinder) is used for these purposes. For cutting concrete, a special attachment is used in the form of a diamond wheel, which can be solid, segmented, or combined.

Types of diamond wheels for grinders that can be used to cut concrete:

Continuous - made with a continuous diamond cutting edge, which ensures that there are no chips in the work. The nozzle periodically heats up, so it requires constant cooling with a stream of water.
Segmented disc – solid base, segmented edge. The circle is inexpensive, but wears out quickly from durable materials. Suitable for dry cutting only.
A combined (also known as turbo-diamond) disc is considered universal, capable of withstanding maximum loads, and can even cut reinforced concrete.

Nozzles are selected in accordance with the material that is planned to be cut, as well as taking into account the type of work and conditions. Reinforced concrete with recesses larger than 10 centimeters is cut only with high-strength discs (turbocharged). All disk segments are attached to the blade by laser welding or silver solder. The first can only be used when cutting using the dry method, the second - wet.

The wheel must be made with an internal diameter corresponding to the diameter of the angle grinder. The rotation speed of the disk is also important - it is desirable that it be higher than that of the grinder. Depending on the type of cutting chosen and the correct selection of tools, the amount of dust generated during the work may vary.

So, if you cut concrete for a long time with an insufficiently strong and ineffective tool with attachments, there will be a lot of dust, but the result is minimal. You can reduce the amount of dust using the wet cutting method - water prevents the tool from overheating and prevents the appearance of dust. This makes it possible to speed up work and increase the life of the diamond bit.

The water supply can be organized in different ways - from spraying the concrete periodically with a spray bottle while performing work to attaching a hose to the tool so that the liquid flows onto the disk in a continuous stream.

A convenient nozzle is made from an ordinary plastic canister. You will also need a cutter, a container of the required size, the neck of which will fit in diameter with the vacuum cleaner hose.

Next, you need to make mounting holes on both sides to make it possible to easily change the direction of rotation of the disk. A slot of a suitable size is made to fit the circle, and another hole is cut to mount the cutter. Carefully connect the hose to the neck of the canister, then secure it with an adapter ring with a clamp. The grinder is sent into the casing, all elements are securely connected. The hole that is not in use is covered with a lid.

To make the cut even, you first need to apply markings, then wooden blocks are attached along the line. After this, you need to make a shallow incision up to 1 centimeter, remove the limiters, and continue working. All manipulations must be performed exclusively in a respirator, safety glasses, gloves, and special clothing.

Cutting concrete with wall saws

Wall saws are used for cutting concrete on a larger scale and for complex jobs. It generates less dust than an angle grinder, productivity and efficiency are much higher.

Features of cutting a concrete monolith with a wall cutting tool:

Diamond cutting of this type is characterized by a large cutting depth, therefore it is used for industrial cutting of hatches/openings and other elements with heavy reinforcement in partitions, walls, and floor slabs. The work is completed in the shortest possible time.
To implement the task, it is necessary to provide free one-way access of 30-35 centimeters.
A lot of water is required for cooling (up to 15 liters per minute), so it must be possible to replenish supplies.
Waste water can be collected with a standard vacuum cleaner.
To operate the equipment, you need an alternating current network with a power of 32A and a voltage of 380V.

Cutting concrete with joint cutters

Joint cutters are also quite often used for tasks of this kind. There are some features that it is advisable to study.

Key features of cutting concrete with a joint cutter:

Typically, one of two types of productive equipment is used - gasoline or electric. The latter option requires a connection to the network; gasoline units can be used anywhere (in the field, in open areas, to create expansion joints in the road surface, etc.).
It is necessary to provide cooling water under high pressure, which will eliminate the risk of overheating and reduce the volume of dust.
For gasoline devices, it is important to provide the possibility of supply and exhaust ventilation if work is carried out indoors.
Electrical equipment will require a 380V AC connection.

Cutting concrete with ropes

This method is used less frequently than all of the above, but is also relevant when performing certain work.

How to cut concrete using special ropes:

To accomplish the task, a special rope and diamond bits, as well as a drive, are used. You can cut any structures without restrictions on thickness (including columns, for example).
For optimal operation of the equipment, it is necessary to provide a supply of cold water under high pressure and a network voltage of 380V.
The cost of work may vary and depends on the following factors: type of material, type and size of the opening, thickness of the structure.
When using this method, a minimum amount of dust appears, and little noise is also created.
Rope cutting allows you to quickly cut openings of any configuration with perfectly smooth edges, even where access is limited.

Preliminary activities

Sanding is getting rid of minor defects, so before starting the process you will have to take care of getting rid of major defects:

These are different types of tubercles. If it is visible to the eye, then it is better to cut it off with a grinder. The maximum permissible tubercle size is 1 mm.
Seams. There should be no visible seams. No amount of sanding can get rid of a seam or dent on a screed. In this case, you will have to fill it again or pour an additional layer on top.
Depressions. It is better to cover up the depressions. There should be no visible cracks, depressions, or dents.
Mark the areas where you will have to sand a little longer, i.e. unevenness of the screed itself. To do this you need to use a level.
After this, you need to check the voltage in the network. A sudden jump or fall can cause the grinder to malfunction, the grinding to break, and the hand to tremble. Because of this, it may be necessary to create the floor from scratch.
The floor itself needs to be tested for strength. To do this, you will have to make a test run with a grinding machine. If the floor crumbles too much, you need to use a nozzle with a smaller grain size or refill the floor.

It is very important to use crushed stone of small fractions when pouring, since no discs are enough to polish a large stone, which will certainly end up in the most inappropriate place for this.

If a small but visible crack has formed, then use a diamond disc to widen the crack and seal it flush with the floor level. You can start sanding only after such seals have dried.

The expansion is carried out to a depth of 10 cm, after which a piece of concrete is removed, the surface is treated with a primer and only after that a sealing layer is applied.

Technology and stages of the grinding process with an angle grinder

Preparation: cleaning surfaces, marking sanding, sealing seams, sawing off protrusions, etc. Be sure to remove all debris before sanding, since this will be extremely difficult to do during work. Nothing should distract you from your work. You need to put the casing on the grinder in advance, as well as turn on and prepare the vacuum cleaner. The attachment of the attachments to the grinder is checked.
Rough grinding. Rough grinding is carried out 3-5 days after the screed is sealed. It is necessary to remove 2.5-3 cm to get rid of the most severe blemishes, cracks and protrusions. After checking the tool, grinding is performed. The 15-minute rule applies to an angle grinder: work is carried out for 15 minutes, after which the tool turns off. You can turn on the grinder again only after the disc has completely cooled down. The heating temperature of the nozzle should not be felt at all. That is, the disk will reach a temperature approximately equal to the ambient temperature.
The next step is impregnation. Special construction impregnations are used to strengthen concrete. The impregnation is literally poured onto the surface of the screed and slightly leveled over its surface. The concrete will absorb this composition for another 10-15 days. The amount of impregnation is calculated in advance. Do not be surprised if immediately after pouring some liquid remains above the surface of the concrete. Over time, the concrete will absorb it too.
Only after this is the final processing carried out. To do this, take a thinner disk with a higher abrasive value. If a disk with an abrasive of 25 is used for rough processing, then for the final one you will have to use a nozzle with an index of 40. The glossy effect is revealed only when using tools with an abrasive of 1400-1500.

How to grind concrete with a grinder

Sanding the floor is not that difficult. The main thing is to be careful when correcting rough defects, follow safety rules and choose the right tools.

It is important to know

Modern manufacturers offer a variety of equipment models, so finding a specific model of equipment in Moscow and the regions will not be difficult (as well as companies or specialists who will quickly and efficiently complete the work). But you need to remember some nuances.

Things to remember when cutting concrete:

Wall saws are not used in multi-storey panel buildings due to the risk of flooding the lower floors with water. The machine is also not suitable for working in confined spaces and when it is necessary to perform small volumes of cutting.
To reduce noise, you can cut openings in parts (at least 6 parts). The price of the work in this case increases and depends on the number of pieces cut out.
All holes/openings in load-bearing structures are made only by certified companies and in strict accordance with the rules.
Legalization of hatches/openings in load-bearing walls requires contacting government agencies with a full package of documents.

Cutting concrete without dust is a difficult task, which can only be partially realized. It is very difficult to completely get rid of dust, but its amount can be significantly reduced through the correct choice of equipment and attachments, cutting method, as well as the use of a construction vacuum cleaner and the creation of special devices for collecting dust.

When might cutting or sawing be required?

Concrete blocks come in standard sizes and the building materials market rarely focuses on selling anything non-standard.

During the construction process, the master understands that he needs to find a block that could complete the masonry in a certain place, and standard material will not work here. In such a situation, you have to resort to cutting the block concrete material.

If concrete blocks of non-standard size are needed in large quantities, then it is better to cast them yourself using homemade molds. You can also order non-standard blocks from the manufacturer, but this will cost more.

Often, a builder may need half or a quarter of a whole concrete block. Then you need to make a cut.

Similar situations often occur when pouring a strip foundation, when all the blocks must be the same size, and when completing its arrangement, several elements are missing. The same situation can arise when constructing a building according to an established design, when the thickness of the walls is already clearly defined and it is impossible to deviate from the values.

Often, when laying corners, it is not possible to fit the concrete block correctly and gaps remain between the stones. Many builders fill them with fragments of material, which is also not entirely true. In this case, it is recommended to pay attention to the tools and methods by which you can quickly and easily cut concrete block material.

How to choose a disc for an angle grinder

Concrete is a durable material, so working with it is quite difficult. To perform cutting, an angle grinder (angle grinder) is most often used. This instrument is better known in everyday life as a “grinder”.

A diamond wheel is used as a nozzle. Depending on their design features, they are divided into several types:

segmental,
solid;
combined (turbocharged).

The first option is a solid base with a segmented edge. This circle is low in cost, but not very suitable for working with durable materials. It should also be taken into account that it is used only for dry cutting. The solid blade has a continuous diamond edge, which prevents chipping during operation. This nozzle heats up quickly, so it must be cooled with a continuous stream of water.

The combined or turbo diamond blade is universal. It can withstand maximum loads and is even suitable for cutting reinforced concrete.

Before purchasing the right type of nozzle, you need to understand what material you will have to work with. Reinforced concrete is reinforced with metal rods, which the cutter may bump into during the process. Therefore, if a deepening of more than 10 cm is expected, high-strength disks should be used, that is, turbocharged ones. Fresh concrete is more abrasive; over time, the material hardens and its strength increases. This factor should also be taken into account when choosing a cutting wheel.

The disk segments are attached to the blade using silver solder or laser welding. The first option is more suitable for wet cutting, the second is used only for dry cutting. When choosing a suitable diamond wheel, you should also pay attention to its diameter, which should match the parameters of the angle grinder. An important criterion is also the rotation speed of the disk. It is better if it is higher than the maximum possible indicator stated in the technical characteristics of the “grinder”. This will ensure optimal operation.

Tool selection factors

You can't do it without using a special sawing tool. When choosing it, it is necessary to take into account a number of factors:

The location of the structure and its dimensions. For thick walls and concrete floor screed, different tools will be used even with the same properties and composition of the stone.
The composition matters: the harder the filler, the more difficult the cutting. Granite crushed stone, one of the hardest, or crumbs of softer stones can be used as a coarse aggregate. You should evaluate the quality and size of the sand - the finer it is, the denser the concrete. Large unwashed stone creates a looser stone structure.
Age and condition of structures. The peculiarity of concrete is that it gains strength over the years. Cement, which makes up the bulk of the composition, only adds strength when absorbing moisture. In combination with fine sand, such a stone becomes very hard. However, dilapidated structures that are exposed to chemical environments lose their former strength and hardness.

Wet cutting technology for concrete

The use of water allows you to cut concrete with a grinder without dust and overheating of the tool. The technology allows us to solve several problems at once:

increase the life of the diamond nozzle,
avoid dust formation,
increase work speed.

One way to ensure a continuous flow of water is to secure the hose so that the liquid flows onto the disc. If there is no running water in the work area, you can involve an assistant in the process. He will use a primitive device made from a plastic bottle to wet the circle. At the same time, the incision site is moistened with liquid. This must be done carefully so that water does not pour into the instrument.

The method is not very applicable in multi-storey buildings, since there is a risk of flooding the neighbors from below.

Ways to reduce dust emissions

For many craftsmen, dust becomes a significant obstacle when cutting concrete structures. It not only makes breathing difficult, but also significantly reduces visibility, which can affect the accuracy of the work being done.

Very often, craftsmen attach a vacuum cleaner to an angle grinder. While the coal grinder is operating, the vacuum cleaner that is turned on collects dust, preventing it from flying in different directions.

There is another way that can reduce dust emissions. It's called wet cutting. The bottom line is that water is supplied to the disc, which wets the concrete and prevents dust from forming. When using water, you must use special discs for wet diamond cutting.

How to make a casing for a vacuum cleaner with your own hands

An angle grinder with a built-in vacuum cleaner allows you to get rid of small particles of material formed during the cutting process with an angle grinder. But what if there is a need to cut concrete with a conventional tool without additional options? The simplest solution would be to purchase a casing for the vacuum cleaner separately or to make the device yourself. You can hire an assistant who will collect the particles formed during cutting with a vacuum cleaner.

You can easily make a convenient nozzle from a simple plastic canister, in which car “anti-freeze” is often sold. To work, you will need a construction cutter and a container of a suitable size, the neck of which will fit the diameter of the vacuum cleaner hose.

The manufacturing sequence is as follows:

Mounting holes are cut on both sides so that you can easily change the direction of rotation of the disk.
A slot of suitable size is made under the circle.
To attach the grinder cutter, another hole is cut.
The hose is connected to the neck of the canister and secured with an adapter ring with a clamp.
The “grinder” is placed in the casing and all the elements are connected.
The unused hole is covered with a lid.

A good dust collector can be made from a simple five-liter plastic bottle. It is attached using a standard protective casing, and the vacuum cleaner pipe is attached to the neck. This design is suitable for any type of work, with the exception of gating.

Last tip: in order to make a straight cut, markings are first applied. Then wooden blocks are fixed along the line. After this, a shallow incision of up to 1 cm is made, the restraints are removed and work continues. Throughout the entire process, coolant is supplied to the disc blade. All manipulations must be carried out wearing protective glasses, a respirator and gloves.

Which Disc to Cut Concrete with a Grinder

Tips for cutting concrete without dust

During repairs or construction, it is necessary to carry out concrete work: cut an opening for a window, a niche, tap walls for wiring. Masters understand how many small particles appear simultaneously. Cleaning up after similar events is a very labor-intensive task. We propose to find out whether it is possible to cut concrete without dust and how to organize the process.

How to choose a disc for an angle grinder

Concrete is a strong material, so working with a child is quite difficult. To perform cutting, in most cases they use an angle grinder (angle grinder). This rumored instrument is not just known in everyday life as a “ grinder ”.

A diamond wheel is used for the nozzle. Depending on the design features, they are divided into several types:

segmental,
solid;
combined (turbocharged).

The first option is essentially a solid base with a segmented edge. This wheel has a low price, but is not very suitable for working with strong materials. It is also necessary to take into account that it is used only for dry cutting. The solid disc has a continuous diamond edge, which prevents chipping during operation. This nozzle heats up quickly, so it needs to be cooled with a continuous stream of water.

Combined or turbo diamond blade

universal. It can withstand critical loads and is even suitable for cutting reinforced concrete.

Cutting concrete to shallow depths

In this case, you can use an angle grinder (angle grinder or in common parlance “grinder”) and a 105-125 mm sintered diamond disc, for example, a segmented diamond disc, a turbo diamond disc or a turbo diamond disc with a wave silent body, mounted on Angle grinder. Segmented diamond cutting blades may cause more cutting problems due to their segmented edges, but are significantly less expensive than other types of blades. Turbo diamond blades with a wave body can be used for high load tasks such as cutting concrete and reinforced concrete, but their price is the highest.

You can first cut the concrete to a depth of 1 cm and see how the angle grinder and diamond blade behave. If there are no problems with the angle grinder, and the disc cuts and does not “stand” in place, you can continue cutting concrete and reinforcement to achieve the cutting depth you need. Each subsequent cut should not be deeper than 1.5 cm.

To reduce dust generation, you can have someone spray water on the diamond blade and cut while cutting. This is also necessary to cool the diamond blade and increase the life of the blade. If the use of water is not safe for the power source of your angle grinder, you must cut concrete “dry”. When dry cutting concrete , air is used as a coolant (cooling medium), so after a certain period of time you must remove the diamond blade from the cutting area and allow it to rotate freely to cool the segments. The period can be from several minutes to several seconds depending on the hardness of the concrete being cut (the harder the concrete, the shorter the cutting period should be).

Throughout the cutting process, you must use a professional dust mask, otherwise you may cause serious harm to your health.

In addition to an angle grinder, you can use professional diamond saws. With a diamond circular saw, you can also use a larger diameter diamond blade, thereby improving cutting efficiency.

What tools are required?

Wall sawing machines

Units of this type are an excellent tool for cutting concrete structures. The machine is equipped with a mount and rails for moving the saw, so it can perform a large amount of work without rest. In addition, using such a mechanism has the following advantages:

increasing the depth of the opening to 7.5 cm;
performing complex work on a large scale;
low vibration and noise levels;
possibility of fixing the machine;
diamond cutting of reinforced concrete in the shortest possible time.

When cutting on such a machine, training courses are provided and access to a 380 W network is provided.

Manual equipment

A grinder for cutting concrete of this type has replaceable discs that are attached to the unit using a screw device. The construction market offers a wide selection of equipment of various sizes and power. The depth of the cut hole reaches 13 cm. The hand cutter is easy to move from place to place and cut in hard-to-reach places. The disadvantages of such a device include the application of great effort on the part of workers, which reduces the volume and time of the continuous process.

If you need to cut concrete to a greater depth?

If you need to cut concrete to a depth of more than 100 mm, for example, you need to cut openings in a concrete wall, you should use special concrete circular saws (electric or hydraulic cutters), which can help you cut concrete up to 160 mm deep quickly and smoothly with one side of the reinforced concrete structure. The diameter of the diamond blade, as a rule, should be at least 350-400 mm. Professional concrete saws and diamond blades can be purchased or rented.

To get good results and improve your concrete cutting efficiency, you can follow the following guidelines:

Determine the type of concrete structure

There are many types of concrete, and different types of diamond blades are used for each type. Some concrete structures have steel reinforcement bars (reinforced concrete). If the cutting depth is around 100mm or deeper, you may encounter steel gratings (reinforcement cage) in your path. There are special diamond blades for cutting reinforced concrete. The curing time of concrete structures varies in different ways. Fresh concrete is more abrasive, while old concrete is harder. Accordingly, diamond blades for cutting fresh concrete and old concrete must be different.

If you have the time and opportunity, you can further research the properties of your concrete, this information will help you select more suitable diamond cutting blades. For example, hard concrete filled with basalt and quartz dulls diamonds faster, so the bond for the segments should be soft so that new diamonds in the segment are “opened up” faster. The size of the concrete aggregate also affects the speed of the tool: the larger the aggregate size, the slower the cutting speed. It should be noted that the type of sand has an impact on the abrasiveness of concrete. River sand is harder than crushed rock sand.

Select the required diamond cutting blades

There are two types of fastening segments to the disk blade. Discs with soldered segments using silver-containing solder are widely used for wet cutting of concrete. Laser welding of diamond segments is often used for dry cutting and is characterized by high productivity.

You should check that the diameter of the diamond blade and its mounting hole match the specifications of your saw. Additionally, you must know the power of the diamond saw you are using. The power of the saw affects the choice of tool. Diamond blades used on power saws must have a stronger bond of segments or a high concentration of diamonds, otherwise the blade(s) can wear out very quickly.

Now that you have determined the diameter of the diamond blade, the size of the hole to mount the blade, the power of your saw, information about the structure of the concrete - you can easily select the diamond blade you need.

Determine cutting type: wet or dry

Concrete is generally cut with water (wet cutting), sufficient water can greatly reduce dust, preserve and improve the life of the diamond blade, and improve cutting efficiency (wet cutting can be a continuous process). However, when there is no source of water near the working area, the work is performed using the dry cutting method. As mentioned above, when dry cutting, the process must be intermittent and superficial. If deep cutting is required, you must make several shallow cuts.

4. Use personal protective equipment

You should at least wear a professional respirator, not only when dry cutting, but also when cutting wet, because the fine dust particles generated during concrete cutting can penetrate deep into the lungs and lead to serious health effects such as cancer lungs or silicosis. If the volume of work is large, it is additionally necessary to use other equipment: gloves, glasses, headphones and special protective clothing.

5. Cut shallow straight lines on the concrete surface

To make a straight cut, you can use chalk or a marker to mark a straight line on the concrete, and then secure wooden guide blocks next to the marking to help make the cut straight. You can then cut shallow lines into the concrete surface along the wood guide blocks. The depth of the cut should be no more than 0.5-1 cm. The presence of this shallow shallow cut will allow you to subsequently cut concrete to the depth you need.

Shape and number of segments

The quality of the work performed depends on the type and number of segments. There are cups for roughing, rough grinding and for fine polishing of surfaces. According to the shape of the cutters, the nozzles are classified into the following types:

With double segment
Square
Boomerang
Turbo
Typhoon

The design of each type provides for a specific arrangement of segments, which affects its operating properties.

The Double Segment Diamond Cup is a two-row tool for eliminating large defects in concrete products. Large beads or protruding seams can be easily sanded with this attachment with a good abrasive effect. Segments arranged in a circle in two rows quickly and efficiently process stone or sandstone. Sometimes builders use a nozzle to reduce a thick layer of screed. But with the help of the “Double Segment” it is impossible to achieve ideal smoothness; the screed becomes rough, so for finishing sanding you need to use a different attachment.

Boomerang

The tool received its name due to the similarity of the shape of the diamond segments to a boomerang. The tool is used for finishing concrete grinding, since the cutters use fine-grained diamond chips. After processing, the screed becomes perfectly smooth. The small weight of the “Boomerang” makes it easy to use; it is often installed on an angle grinder because it is light in weight. The popularity of this type of cup is due to its high productivity, which is almost twice that of other types of diamond blades. The choice of this particular tool is also influenced by its lightness and stability.

Square

Diamond cups “Square” are used for roughening concrete surfaces. The effectiveness of the tool allows it to be used to remove large sagging and protruding seams. Diamond cutters are made in the form of squares. The increased thickness of the working segments and the large distance between them make it possible not only to level the surface with roughness, but also to remove any protruding parts on the concrete. Therefore, grinding with the “Square” attachment reduces the time for rough processing of concrete and brick coatings, extending the life of the diamond segments.

“Square” have a lot of weight, making it possible to process the material with a tool without much effort.

After passing through the diamond cup, the surface remains rough, which gives it high adhesive properties.

This is especially important for adhesion to applied coatings, especially polymer ones

Turbo and Typhoon

The diamond cutters of these attachments are located in a circle on the working surface perpendicular to the direction of rotation. The minimum distance between them creates an almost continuous ring. The appearance of “Turbo” and “Typhoon” disks resembles corrugated fabric. Many segments smoothly polish the surface, so the products are used for finishing grinding on small areas and for shaped stone processing. Using attachments, you can chamfer and form edges, as well as polish small curves on workpieces.

To perform small operations, you can purchase “Turbo” and “Typhoon” cups of small diameter – from 100 mm. The discs are characterized by wear resistance, high productivity and precision processing.

Additional recommendations for cutting concrete

If the volume of concrete cutting work is not significant and you do not use diamond blades often, you can choose economy class blades, which will allow you to reduce the cost of purchasing tools.

If you use diamond blades frequently or the volume of work is quite large, you should choose high-quality professional diamond cutting blades that provide long cutting life.

If you're not sure you can do the job yourself, you'll simply need to hire a professional diamond drilling and concrete cutting company to do the dirty work for you.

Professional circles

For production purposes, professional diamond wheels with diameters from 125 to 350 millimeters are used. Their cost is significantly higher than the price of similar household cutting tools, but their very high wear resistance and excellent quality of abrasive coating ultimately make them more profitable for regular use.

The high price of professional discs is justified due to their high durability. Products from Distar and Bosch have excellent performance, but the price for one such circle with a transverse size of 230 mm is more than 2,600 rubles.

Classification of professional diamond blades by purpose:

cutting reinforced concrete;
making carvings on a concrete base;
cutting marble, ceramics, granite massifs.

It is very important to understand that if the purpose of professional tools does not correspond to the purposes of use, they will wear out very quickly, and ultimately the costs of performing the work will increase.

During repairs or construction, from time to time it is necessary to carry out concrete work: cut an opening for a window, a niche, tap walls for wiring. Masters understand how many small particles appear in all this. Cleaning up after similar events is a very labor-intensive task. We suggest you figure out whether it is possible to cut concrete without dust and how to organize this process.

How to choose a disc for an angle grinder

Concrete is a strong material, so working with it is quite difficult. To perform cutting, in most cases they use an angle grinder (angle grinder). How to cut tiles with a grinder without chipping and how to saw without the concrete itself. This instrument is better known in everyday life as a “ grinder ”.

A diamond wheel is used as a nozzle. Depending on the design features, they are divided into several types:

segmental,
solid;
combined (turbocharged).

Option 1 is a solid base with a segmented edge. This wheel has a low price, but is not very suitable for working with strong materials. It is also necessary to take into account that it is used only for dry cutting. Maybe there is some know-how to saw the walls of a house like a grinder, and I didn’t even cut concrete. The solid disc has a continuous diamond edge, which prevents chipping during operation. This nozzle heats up quickly, so it needs to be cooled with a continuous stream of water.

A combined or turbo diamond blade is universal. It can withstand critical loads and is even suitable for cutting reinforced concrete.

Wall chipping

A groove is a recess in the wall in the form of a groove into which electrical wiring is laid in accordance with electrical safety requirements. To create a proper interior, pipelines or communication wires are hidden in the grooves. The production of such grooves in the wall is called gating. As the main working tool, you will need a wall chaser, which can do the work very quickly. Two diamond discs installed simultaneously on the same axis will carry out scoring in one step.

Wall chaser Interskol PD-230/2600E with dust removal. Photo VseInstruments.ru

Using a grinder with a diamond blade, this work is done in several steps. Alternately, you should make one furrow first, and then a second one at the required distance. The material between the furrows can be removed using a hammer drill with an impact function. To create more comfortable conditions, it is necessary to connect a construction vacuum cleaner. You can connect the grinder to the dust suction device yourself. There are many videos on the Internet with information on how to do this.

Angle grinder, how to groove correctly

To groove using an angle grinder, you need to install a diamond disc suitable for the concrete material from which the wall is made. The diameter of the circle must be suitable for the power tool. The walls can be reinforced with reinforcement, so it is better to install a universal turbo disc on the angle grinder. An ordinary disk on concrete will immediately fly apart when it hits the reinforcement, and given the high speed of the grinder, this can be very dangerous. The cut should only be straight, there should be no curved or figured cuts in order to maintain safety.

Protective casing and wall chaser SG-230-R (230 mm) STOMER for angle grinders. Photo VseInstrumenty.ru

When producing grooves for wiring, the following rules specified by state standards must be observed.

The grooves should only be vertical or horizontal relative to the base surface of the building.
It is strictly prohibited to scratch load-bearing walls.
The horizontal groove must be at a distance of at least 15 cm from the floor slab.
Vertical grooves must be at a distance of at least 10 cm from door and window openings, and at least 40 cm from the location of gas pipes.
The documents specify the thickness and width of the groove (no more than 2.5 cm is recommended).
Touching the reinforcement bars when scoring is not recommended. However, it is quite difficult to comply with this requirement due to the not always precise location of the reinforcement cage inside the concrete wall.

The listed requirements prevent the threat of destruction of building structures after the production of electrical wiring necessary for life.