CEMENT GUNS- an installation for spraying onto the surface of building structures and structures mortar and concrete mixture - shotcrete, which has water resistance and increased strength, elasticity, fire resistance, frost resistance, acid resistance, etc. Gun cement is used in the construction and repair of hydraulic, industrial and civil structures, and also as a sandblasting machine.
The technological process of shotcrete involves introducing a dry concrete mixture through a cement gun feeder into a rubber hose, through which it is supplied with a stream of compressed air to the work site. At the outlet of the hose, the mixture is moistened in a special nozzle with water, which is supplied under pressure from a centrifugal pump or water tank through another hose. The moistened mixture flies out of the nozzle at a speed of 50-70 m/sec, covers the surface, building up a layer of shotcrete on it. The main indicator of a cement gun is the dry mix output in m3/hour.
The C-630A model cement gun has two chambers instead of a sluice drum: a sluice chamber (upper) and a working chamber (lower). The chambers are equipped with bell valves, with which you can load the upper chamber and transfer the mixture to the lower one without interrupting the technological process. The mixture is fed into the material hose by a disc feeder located in the lower chamber and rotated by an air motor. The design of the S-630A cement gun allows the use of aggregate with a particle size of up to 52 mm at a humidity of up to 6-8%.
TO category:
Machines and installations for processing non-metallic materials
Cement guns (installations for pneumatic spraying of concrete mixture)
Cement guns are designed for shotcrete - applying layers of compacted concrete mixture to the concrete surfaces of tanks, tunnels and other concrete structures using compressed air for the purpose of waterproofing or decorative properties. The concrete mixture is ejected from the nozzle at a speed of 50...70 m/s and forms a dense layer on the concrete surface.
Rice. 1. Cement gun
Cement gun SB-13 (S-320) (Fig. 2) is intended for applying a compacted layer of cement-sand mixtures on the surfaces of various types of industrial, hydraulic and road structures. The cement gun is a continuous unit and consists of a hopper with a mesh, a sluice drum, a dispenser with a drive mechanism and an electric motor, a running gear, a water pump, a nozzle and connecting hoses.
Rice. 2. Cement gun SB-13 (S-320):
a - general view; b - design diagram; 1 - electric motor; 2 - water pump; 3 - outlet pipe; 4 - bunker; 5 - clamping ring; 6 - switch; 7 - clamping bolt; c - base of the bunker; 5 - dispenser cavity; 10 and 12 ‘sealing discs; 11 - sluice drum; 13 - incentive
The dry mixture is fed to the bunker mesh and sifted. Through the holes of the upper sealing disk, the mixture enters the cells of the sluice drum. The latter, continuously rotating, delivers the mixture to the discharge hole of the lower sealing disk, from where it spills into the dispenser cavity. The pockets of the rotating wing drum of the dispenser are filled with portions of the mixture and transfer it from the upper to the lower position. In this case, the pockets fall under a stream of compressed air supplied to the cement gun from the compressor, the mixture is blown in the longitudinal direction and carried into a rubber hose attached to the dispenser lid. At the end of the hose there is a spray nozzle, to which water is supplied from the water pump. In the nozzle, the dry mixture is mixed with water, and then thrown at high speed onto the surface to be treated.
(TU 22-3705-76) consists of a loading hopper, a drum, a drive mechanism, a material hose, and a control panel. For ease of movement, the cement gun is equipped with wheels and a drawbar (Fig. 30).
Rice. 30. Cement gun SB-117: 1 - control panel; 2 - frame; 3 - drawbar; 4, 6, 7 - taps; 5 - packet switch; 8 - loading hopper; 9 - emphasis; 10 - material hose; 11 - drive mechanism; 12 - wheel.
A drum is installed under the hopper, on the output shaft of the drive mechanism. The upper and lower parts of the drum have sealing rings secured by cylindrical projections. The drum is covered with a casing, to which a stop is welded to fix the base of the hopper and prevent rotation. On the outer surface of the casing there are three folding clamping devices that press the rubber sealing discs to the drum through rubber shock absorbers. An outlet pipe is attached to the bottom of the plate, to which a material hose is connected.
During operation, the dry mixture is sieved on the hopper mesh and enters the drum cells through holes in the base of the hopper and the upper sealing disk. A continuously rotating drum transfers cells with the mixture to the loading hole of the lower sealing disk and then (through the hole in the plate) to the outlet pipe. Complete emptying of the drum cells is facilitated by compressed air supplied to the top of the cell through the base of the hopper. From the outlet pipe, the mixture enters a material hose, through which it is transported by compressed air supplied to the outlet pipe. At the end of the material hose, the dry mixture is moistened with water and applied as a sprayed mass to the surface to be insulated.
For applying plaster waterproofing, direct-flow diaphragm mortar pumps with pneumatic attachment(Fig. 31). During operation, the solution from the hopper is sucked into the working chamber and pushed out of it under pressure up to 0.6 MPa through a ball discharge valve into the mixing chamber, where it is picked up by compressed air coming from the fitting and through a swirler enters the material hose, on the cone of which a conical nozzle is mounted .
Rice. 31. Structural diagram of the “Pneumoconcrete” installation: 1 - electric motor; 2 - pumping chamber; 3 - water; 4 - filling and safety device; 5 - rubber diaphragm; 6 - vibrating sieve, 7 - hopper; 8 - suction ball valve; 9 - ball valve baskets; 10 - discharge ball valve; 11 - valve chamber; 12 - mixing chamber; 13 - flexible hose; 14 - swirler; 15 - pipes for compressed air; 16 - solution pump chamber; 17 - plunger; 18 - connecting rod; 19 - crankshaft; 20 - gears.
The installation of plaster waterproofing may include the operation of smoothing the surface of the plaster layer. For this purpose, plastering and troweling machines SO-86A (TU 22-4244-78) and SO-112A (TU 22-4744-80) are used.
To waterproof rooms such as swimming pools, reservoirs, and damp basements, dense waterproof plaster - gunite - plaster is used.
Shotcrete - plaster is applied using a cement gun. The method of applying plaster with a cement gun is called shotcrete. Shotcrete occurs under high pressure of compressed air, due to which the solution jet is imparted a high speed. Layer of shotcrete - plaster 15-25 thick mm, applied to the surface, is a fairly reliable waterproofing, since the applied solution is highly compacted. After 28 days of hardening under natural conditions, shotcrete plaster reaches a tensile strength of 15 kg/cm 3 .
Units for applying shotcrete - plasters. Shotcrete plaster is applied using a unit that includes a cement gun, an air purifier, a water tank and a compressor. The main machine is a cement gun.
Cement guns come in various brands: SSSM-067, S-165A, S-165B, S-320A and 0-54. Regardless of the design of the cement gun, the operating principle is the same.
Cement gun SSSM-067 (Fig. 128, a) consists of an upper 11
and lower 15
truncated cones-reservoirs, or chambers, fastened into one whole.
The upper tank has a loading funnel through which it is filled with dry mixture. A steel pipeline runs from the outside of the housing; Flexible hoses are connected to it from the compressor. Compressed air is supplied to the cement gun through these hoses.
Cement gun S-165B (Fig. 128, b) has the same device as SSSM-067. It can also be used as a sandblaster to clean the surfaces of various structures from dirt, soot, and rust.
An air purifier is necessary to clean the compressed air pumped by the compressor into the cement gun.
The air cleaner is a welded cylinder. At the top of the bottom there is an inlet pipe to which a hose is connected to supply compressed air from the compressor. The cover has an outlet pipe: an air hose is connected to it, supplying compressed air purified from water and oil to the cement gun. Inside the air purifier there is a porous porcelain filter that cleans the air supplied by the compressor from dust, moisture and oil.
Before applying shotcrete plaster, water is supplied to the nozzle under pressure of 0.5 atm higher than the air pressure in the cement gun. This can be achieved by connecting a water hose to the water supply. If there is no water supply or there is very little pressure in it, then a special tank is used to supply water, to which a compressor is connected, with which you can increase the pressure.
Rubber hoses are used to connect the cement gun, air cleaner, water tank and compressor, as well as to supply water to the workplace from the cement gun to the dry mixture nozzle and from the water tank.
The hoses through which the dry cement-sand mixture is supplied are called material, through which air is supplied - air, and through which water - water. For strength, the hoses are reinforced with 3-5 layers of cord (special durable fabric). The hoses are covered with soft, wear-resistant rubber on the inside, and harder rubber on the outside, which protects them from being pressed through.
Material hoses are produced with a diameter of 25-38 mm. It is more advisable to use hoses with a diameter of 32 mm. The use of hoses of smaller diameter reduces the productivity of the cement gun and leads to the rapid formation of plugs. Water hoses are used with a diameter of 13 mm. The individual hose sections are connected with screw-on couplings. Couplings with hoses are fastened with rivets or countersunk bolts. To prevent hoses from leaking air, the connections must be strong and tight.
. A nozzle is used to mix the dry mixture with water and apply the solution to the surface (Fig. 129). The nozzle consists of a body 1
and a ring-shaped chamber with inserted mixers 2
. The mixer is a ring with eight inclined radial holes. A metal conical barrel is attached to the mixer body on the front side 3
with inner liner 4
made of rubber, protecting the barrel from rapid abrasion. A material hose is secured to the rear side of the housing using a half-nut. 5
, through which the dry mixture is supplied to the nozzle. A pipe is attached to the top of the body 6
with valve 7
, a water hose is connected to the valve 8
. Water supplied from the pipe enters the mixing chamber in streams and, meeting the cement-sand mixture, mixes - a solution is formed. The solution is forcefully ejected by compressed air from the nozzle onto the surface, penetrates into all its irregularities and is firmly connected to it.
More advanced are the cement guns S-320A and O-54. They have water pumps that can supply water at the right pressure to the nozzle from any source. They can operate without an air purifier, making the unit more compact. In addition, they are mobile continuous machines.
Cement gun S-320A (Fig. 130) is intended for applying a waterproofing layer to various surfaces, for cleaning them with an air-sand jet. It consists of a bunker 4
, housing, four wheels, sluice drum 8
, dispenser 10
with drive mechanism and water pump. Bunker 4
has a mesh, which is necessary for control sifting of the dry mixture.
An electric motor is installed on the cement gun; it drives the dispenser and the gear water pump, which supplies the nozzle with water.
Technical characteristics of the cement gun S-320A
Productivity in terms of dry material consumption, m 3 /h .... 1,5
The average thickness of the layer applied at one time is mm ...... 20
Acceptable grain size, mm............... 8
Dry mixture supply range, m:
horizontal........................... 70
vertical............................. 30
Highest air pressure kg/cm 2 ............ 3-3,5
Water pump (performance), l/sec, at pressure up to 40 m.... 0,23
Weight, kg:
without hose........................ 800
with hose........................ 950
The 0-54 cement gun is a smaller version of the S-320 cement gun. The productivity of the cement gun 0-54 is lower. Its main purpose is to clean facades using air-sand and water-emulsion mixtures, as well as to apply compacted plaster in one layer.
Technical characteristics of cement gun 0-54
Surface area to be cleaned, m 3 /h:
using an air-sand mixture...........up to 50
using water-emulsion mixtures..........up to 15
Consumption of dry materials, m 3 /h...............up to 1
Air consumption, m3/min:
with air-sand mixture...................up to 2.5
for water-emulsion mixtures..............up to 1
Air pressure, kg/cm 3 ...................up to 5
Feeding range m:
air-sand mixture.............up to 30
water-emulsion mixtures................up to 40
Electric motor power, kW..........................2,8
Dimensions, mm:
length........................1100
width........................580
height........................1100
Weight, kg..............................250
Preparation of dry mixture for shotcrete plaster. The dry mixture is prepared in stationary installations and delivered by truck to the place of work. It is prepared both on a construction site in mixers and, as an exception, on a striker by hand using the prancing method.
To protect the dry mixture from moisture, it is necessary to have a chest with a tight-fitting lid at the work site.
Before use, it is recommended to additionally sift the mixture brought from a stationary mortar unit or prepared at a construction site through a sieve with cells with a cross section of 8X8 mm so that it mixes better and becomes more homogeneous. This mixture is well transported through hoses.
To prepare shotcrete plaster, grade 300 or 400 cement and river sand are used. The ratio between cement and sand ranges from 1:1 to 1:8.
The sand used must be sufficiently dry and clean; Sand contamination reduces the strength of shotcrete plaster. Permissible sand moisture content is 6-10%. If its humidity is less than 4%, sand should not be used, since the prepared mixture will separate when transported through material hoses. Overdried sand does not mix well with water in the nozzle, resulting in a cement mortar that is uneven in composition. The use of excessively fine sand reduces the strength of shotcrete plaster by two or more times.
To speed up the setting of shotcrete plaster, add calcium chloride or liquid glass. Calcium chloride is introduced no more than 5% by weight of cement. Calcium chloride is used only in low temperature conditions (below + 5° C). Liquid glass is administered in the amount specified by the laboratory.
To obtain greater water resistance, ceresite can be added to shotcrete plaster in a ratio of 1: 10 (1 part ceresite and 10 parts water) or sodium aluminate from 1: 6 to 1: 15, where 6 to 15 parts of water are taken per 1 part. These chemical additives are dissolved in water and poured into the dosing tank.
Shotcrete with a cement gun. Before starting work with a cement gun, first of all, install a gunite unit (Fig. 131): near the cement gun 1
air purifier 4
, storage tank 3
for water and a little further on the compressor. A hose with two branches is connected from the compressor. One end is connected to the air purifier, the other to a water tank. The hose from the air purifier is connected to a cement gun. Thus, compressed air will be supplied to the cement gun from the compressor. A material hose is connected to the nozzle from the cement gun, and a water hose is connected from the tank.
After installing the unit, you need to check how it works and make sure that there is no air leaking anywhere.
The cement-sand mixture is loaded into the upper chamber of the cement gun, and under the influence of its own weight the mixture is poured into the lower chamber. The shutter closes and compressed air is admitted into the chamber. The mixture is supplied to the nozzle using a distribution plate. Compressed air passing through the nozzle picks up the mixture and blows it through the nozzle and material hose to the nozzle.
As soon as the loosened, suspended mixture, picked up by a stream of compressed air, approaches the nozzle, it is moistened with water, mixed in the mixer, turned into a solution and ejected with a strong jet from the nozzle.
The amount of water supplied to the mixer is controlled by a valve. The dosage of water supplied to the mixture is checked by the color of the jet ejected from the nozzle and by the color of the applied shotcrete plaster.
With an excessive dosage of water (Fig. 132, a), a liquid solution is obtained that slides off the applied surface. If there is a lack of water (Fig. 132, b) in the mixture, the solution is not completely wetted and when ejected from the nozzle it generates a lot of dust.
Driver is obliged not only to monitor the operation of the cement gun and the air pressure, which must correspond to that specified in the machine’s passport, but also the presence of water in the tank; Periodically, 3-4 times per shift, he should blow out the air filter.
Shotcrete of surfaces is carried out by a team consisting of two plasterers of the 4th category, one plasterer of the 3rd category and a machinist of the 4th category.
The responsibilities of the unit include washing the shotcrete surfaces with water, preparing a dry mixture, loading it into a cement gun and gunning. During a shift, the link must shootcrete at least 100 m 2 surfaces.
In a properly equipped unit, productivity reaches 150 m 2 per shift with applied layer thickness 20 mm. With centralized preparation of the mixture, productivity increases.
Motor mechanic, In addition to managing the cement gun, he is also required to take part in loading the cement gun with mixture.
A 4th category plasterer washes surfaces, supervises the preparation of the mixture, applies a layer of mortar to the surface, tightens and removes hoses, identifies formed mortar plugs and eliminates them, monitors the operation of the machine, the quality of work and performs various auxiliary work.
The second plasterer of the 3rd category helps the first and, if necessary, replaces him; In addition, he is the liaison between the plasterer and the minder. With a 4th category plasterer, he prepares the dry mixture and loads the cement gun.
If the dry mixture is prepared on site, then a 3rd category plasterer delivers sifted sand and cement to the work site, pours them onto the striker and shovels them together with a 4th category plasterer, and loads the prepared mixture together with the mechanic into a cement gun.
If the surface of the shotcrete plaster needs to be rubbed down, then a 3rd or 2nd grade plasterer is additionally attached to the link. When performing improved plaster, a 3rd category plasterer works, and when performing simple plaster, a 2nd category plasterer works.
For work, it is necessary to prepare such an area that could be shotcrete during one work shift. The surface must be cleaned in advance and only moistened with water before applying shotcrete plaster.
It is recommended to plaster from top to bottom. Moreover, the thinner the layers of plaster applied and the more of them, the stronger the shotcrete plaster and the more reliably it will provide water and gas impermeability.
It is recommended to apply each new layer on top of the previous one after it has set, but not earlier than after 60 min. The first layer of shotcrete plaster is most often applied with a thickness of 15 mm, then it is leveled by cutting off individual irregularities with a spatula or trowel. The first layer is kept for 24 h, then it is moistened with water and a second layer is applied.
When shotcreting nozzleman holds the nozzle perpendicular to the surface at a distance of 70-80 cm from her. Smaller grains of sand in the solution quickly clog into pores and cavities and are the first to settle on the surface; Larger grains of sand, hitting small ones, compact them, but at the same time partially bounce off. As the layer of gunite plaster grows, large grains of sand also begin to sink into it. At first, the rebound of coarse sand reaches 20-25%, but gradually, as the layer is applied, it decreases. Basically, grains of sand bounce off without a cement layer, so the loss of binder is insignificant. Before starting work, the joints of the shotcrete areas should be thoroughly cleaned of settled dust and moistened with water.
To avoid shrinkage cracks and increase the durability of the applied shotcrete plaster, it requires appropriate care. Shotcrete areas should be protected from drafts, excessive solar heat and mechanical damage. It is best to cover the surfaces with two or three sheets of tarpaulin, overlapping one another. The tarpaulin should be pre-moistened with water; To constantly moisten the tarpaulin, you need to install a perforated tube above it through which water is supplied. Where shotcrete plaster is used in the form of ordinary plaster, it is recommended to moisten it for 5-7 days.
Every day after work, the cement gun, hoses and nozzles should be thoroughly cleaned; first blow with a stream of compressed air, and then, without disassembling the machine, clean all accessible places. Regularly, at least once a week, it is necessary to disassemble, clean and lubricate the machine, and wash its individual parts with kerosene. Uninterrupted operation of the unit is possible only with proper and timely care.
Safety precautions. Before starting work, the team servicing the cement gun must be briefed on labor safety rules.
Since an almost semi-dry mixture is ejected from a cement gun, plasterers need to wear goggles and a respirator. You should work in thick overalls and gloves. When working at height, workers are required to wear safety belts and securely tie themselves to reliable structural elements of buildings.
The plasterer must be careful to ensure that no one gets caught in the spray of gunite plaster.
All electrical wires going to the unit must be carefully insulated and placed in boxes if they run on the ground, or suspended above a person’s height, since the unit operates from a lighting network with a voltage of 220 V.
Scaffold decks must be strong and continuous. Before starting work, the plasterer must carefully check all hose connections and, during work, ensure that the air pressure in the cement gun does not exceed that specified in the instructions.
When removing solution plugs, workers not associated with this operation are prohibited from being near the hoses; the nozzle and open mortar hose must be directed in a direction that is safe for workers.
When disconnecting the hose, pressing the assembled unit and testing there should be no unauthorized persons near the unit.
To waterproof rooms such as swimming pools, reservoirs, and damp basements, dense waterproof plaster - shotcrete plaster - is used.
Shotcrete plaster is applied using a cement gun. The method of applying plaster with a cement gun is called shotcrete. Shotcrete occurs under high pressure of compressed air, due to which the solution jet is imparted a high speed.
A layer of shotcrete plaster 15-25 mm thick applied to the surface is a fairly reliable waterproofing, since the applied solution is highly compacted. After 28 days of hardening under natural conditions, shotcrete plaster reaches a tensile strength of 15 kg/cm 3 .
Shotcrete plaster is applied using a unit that includes a cement gun, an air purifier, a water tank and a compressor. The main machine is a cement gun.
Cement guns come in various brands: SSSM-067, S-165A, S-165B, S-320A and 0-54. Regardless of the design of the cement gun, the operating principle is the same.
Cement gun SSSM-067 (Fig. 128, a) consists of the upper 11 and lower 15 truncated cones-reservoirs, or chambers, fastened into one whole.
Rice. 128. Section of cement guns:
a - cement gun SSSM-067, b - cement gun S-165B; 1 - motor, 2 - distribution plate, 3 - dry mix ripper, 4 - special tube, 5 - rubber gaskets, 6 - upper bell-shaped shutter, 7 - loading funnel, 8 - lever handle, 9 - upper lever handle, 10, 13 - taps for supplying compressed air to the upper and lower chambers, 11 - upper cone chamber, 12 - lower lever handle, 14 - lower valve, 15 - lower cone chamber, 16 - neck of the pipe, 17 - pipe, 18 - upper chamber, 19 - down Cam
The upper tank has a loading funnel through which it is filled with dry mixture. A steel pipeline runs from the outside of the housing; Flexible hoses are connected to it from the compressor. Compressed air is supplied to the cement gun through these hoses.
Cement gun S-165B (Fig. 128, b) has the same device as SSSM-067. It can also be used as a sandblaster to clean the surfaces of various structures from dirt, soot, and rust.
An air purifier is necessary to clean the compressed air pumped by the compressor into the cement gun.
The air cleaner is a welded cylinder. At the top of the bottom there is an inlet pipe to which a hose is connected to supply compressed air from the compressor. The cover has an outlet pipe: an air hose is connected to it, supplying compressed air purified from water and oil to the cement gun. Inside the air purifier there is a porous porcelain filter that cleans the air supplied by the compressor from dust, moisture and oil.
Before applying shotcrete plaster, water is supplied to the nozzle at a pressure 0.5 atm higher than the air pressure in the cement gun. This can be achieved by connecting a water hose to the water supply. If there is no water supply or there is very little pressure in it, then a special tank is used to supply water, to which a compressor is connected, with which you can increase the pressure.
Rubber hoses are used to connect the cement gun, air cleaner, water tank and compressor, as well as to supply water to the workplace from the cement gun to the dry mixture nozzle and from the water tank.
The hoses through which the dry cement-sand mixture is supplied are called material, through which air is supplied - air, and through which water - water. For strength, the hoses are reinforced with 3-5 layers of cord (special durable fabric). The hoses are covered with soft, wear-resistant rubber on the inside, and harder rubber on the outside, which protects them from being pressed through.
Material hoses are produced with a diameter of 25-38 mm. It is more advisable to use hoses with a diameter of 32 mm. The use of hoses of smaller diameter reduces the productivity of the cement gun and leads to the rapid formation of plugs.
Water hoses are used with a diameter of 13 mm. The individual hose sections are connected with screw-on couplings. Couplings with hoses are fastened with rivets or countersunk bolts. To prevent hoses from leaking air, the connections must be strong and tight.
A nozzle is used to mix the dry mixture with water and apply the solution to the surface (Fig. 129). The nozzle consists of a body 1 and a ring-shaped chamber with inserted mixers 2. The mixer is a ring with eight oblique radial holes. A metal conical barrel 3 with an internal rubber liner 4 is attached to the mixer body on the front side, protecting the barrel from rapid abrasion. On the back side of the housing, a material hose 5 is secured with a half-nut, through which the dry mixture is supplied to the nozzle.
Rice. 129. Nozzle for applying solution:
1 - body, 2 - mixer, 3 - conical barrel, 4 - rubber liner, 5 - material hose, 6 - pipe, 7 - valve, 8 - water hose
At the top of the body is attached a pipe 6 with a valve 7, a water hose 8 is attached to the valve. The water supplied from the pipe enters the mixing chamber in streams and, meeting the cement-sand mixture, is mixed and a solution is formed. The solution is forcefully ejected by compressed air from the nozzle onto the surface, penetrates into all its irregularities and is firmly connected to it.
More advanced are the cement guns S-320A and 0-54. They have water pumps that can supply water at the right pressure to the nozzle from any source. They can operate without an air purifier, making the unit more compact.
In addition, they are mobile continuous machines.
Cement gun S-320A (Fig. 130) is intended for applying a waterproofing layer to various surfaces, for cleaning them with an air-sand jet. It consists of a hopper 4, a housing, four wheels, a sluice drum 5, a dispenser 10 with a drive mechanism and a water pump. Hopper 4 has a mesh, which is necessary for control sifting of the dry mixture.
Rice. 130. Section of cement gun S-320A:
1 - bracket ring, 2 - hopper base, 3 - incentive, 4 - hopper, b, 9 - rubber gaskets, 6 - handwheel, 7 - sluice drum casing, 8 - sluice drum, 10 - dispenser
An electric motor is installed on the cement gun; it drives the dispenser and the gear water pump, which supplies the nozzle with water.
Technical characteristics of the cement gun S-320A
The 0-54 cement gun is a smaller version of the S-320 cement gun. The productivity of the cement gun 0-54 is lower. Its main purpose is to clean facades using air-sand and water-emulsion mixtures, as well as to apply compacted plaster in one layer.
Technical characteristics of cement gun 0-54
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