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Double-layer steel mesh has more advantages in concrete pavement construction in the following special environments: Heavy-load traffic environment – In areas where heavy-loaded vehicles frequently travel, such as ports, large logistics parks, and mines, the road surface is subjected to huge pressure and impact. Double-layer steel mesh can effectively improve the bending tensile strength and shear strength of concrete pavement, enhance the bearing capacity of the pavement structure, reduce cracks and deformation caused by repeated rolling of heavy-loaded vehicles, and extend the service life of the pavement. Soft foundation environment – When concrete pavement is built on soft foundations such as soft soil, swamps, or high groundwater levels, uneven settlement of the foundation can easily cause pavement cracking. Double-layer steel mesh can better disperse the load and resist the tensile stress caused by foundation settlement by increasing the overall stiffness of the pavement structure, thereby maintaining the integrity and stability of the pavement. Environment with large temperature changes – In areas with large temperature differences between day and night or significant seasonal temperature changes, concrete pavements will generate large internal stresses due to thermal expansion and contraction. Double-layer steel mesh can constrain the deformation of concrete, reduce cracks caused by temperature stress, improve the crack resistance of the pavement, and ensure that the pavement can still maintain good performance under temperature changes. Earthquake-prone environment – In areas with frequent seismic activities, concrete pavements need to have higher seismic resistance. Double-layer steel mesh can enhance the ductility and toughness of concrete structures. When an earthquake occurs, it can absorb and dissipate seismic energy, reduce the degree of damage to the pavement, and improve the pavement's passability after the earthquake, providing protection for disaster relief and traffic restoration. Click the below to jump immediately!!! AMOUR JOINT CONCRETE LASER LEVELING MACHINE LIGHT TOWER POWER TROWEL SLIPFORM MACHINE STEEL FIBER TOPPING SPREADER TRACKED MINI DUMPER

How is the construction process of concrete pavement with double-layer steel mesh different from that of single-layer steel mesh? The construction process of concrete pavement with double-layer steel mesh differs from that of single-layer steel mesh in the following aspects: Steel bar processing and installation – Single-layer steel mesh: – Steel bar processing mainly involves straightening, cutting, bending, etc. according to design requirements. After the processed steel bars are transported to the construction site, they are laid directly on the base. – Usually, the steel mesh is placed in the designated position by manual or small machinery, and fixed with iron wire or steel bar horse stool to ensure that there is a certain protective layer thickness between the steel mesh and the base, generally 3-5cm. – Double-layer steel mesh: – In addition to basic steel bar processing, for double-layer steel mesh, supporting steel bars or horse stool bars need to be set between the upper and lower steel meshes to ensure that the spacing between the two layers of steel mesh meets the design requirements, generally about 15-30cm. – First lay the lower steel mesh, and then install the upper steel mesh after fixing it. During the process, the position and spacing of the two layers of steel mesh must be strictly controlled to ensure that they do not shift during the concrete pouring process. Formwork installation – Single-layer steel mesh: – The installation of the formwork is mainly to ensure that its position is accurate and firm, and it can withstand the lateral pressure during concrete pouring. The height of the formwork is generally consistent with the design thickness of the concrete pavement. – Double-layer steel mesh: – Due to the existence of double-layer steel mesh, the installation of the formwork requires higher precision. When installing the formwork, it is necessary to consider the position of the steel mesh and the thickness of the protective layer to ensure that the spacing between the formwork and the steel mesh is uniform, and to prevent the formwork from squeezing the steel mesh and causing its position deviation. Concrete pouring and vibration – Single-layer steel mesh: – When pouring concrete, the concrete can be directly poured into the formwork, and the inserted vibrator and the flat vibrator can be used to vibrate to make the concrete dense. During the vibration process, be careful to avoid the vibrator rod directly touching the steel mesh to avoid displacement of the steel mesh. – Double-layer steel mesh: – When pouring concrete, in order to avoid the upper steel mesh displacement caused by the impact of concrete falling, a more reasonable pouring method needs to be adopted, such as evenly spreading the concrete along one side of the formwork, allowing the concrete to slowly flow to the other side, or using a layered pouring method. – When vibrating, in addition to using an insert vibrator and a flat vibrator, for the concrete between the double-layer steel mesh, it may be necessary to use a small vibrating rod or vibrating sheet for auxiliary vibration to ensure that the concrete can be fully compacted between the two layers of steel mesh. At the same time, pay more attention to the operation of the vibrating rod to avoid touching the steel mesh and causing it to deform. Surface treatment and maintenance – Single-layer steel mesh: – After the concrete is vibrated, use a scraper to flatten the surface, and then perform surface treatment procedures such as smoothing, and finally cover with a curing film or sprinkle water for maintenance to keep the concrete surface moist and prevent the surface from losing water and cracking. – Double-layer steel mesh: – During surface treatment, due to the restraining effect of the double-layer steel mesh on the concrete surface, more care should be taken during operations such as polishing to avoid uneven surfaces caused by the influence of the steel mesh. – During the curing process, it is necessary to ensure that the curing measures can fully cure both the interior and surface of the concrete, because the double-layer steel mesh will affect the migration and heat dissipation of the moisture inside the concrete to a certain extent, so the curing time may need to be appropriately extended, generally not less than 7 days. Click the below to jump immediately!!! CONCRETE LASER LEVELING MACHINE POWER TROWEL TRACKED MINI DUMPER AMOUR JOINT LIGHT TOWER STEEL FIBER

What quality problems of concrete surface can be solved by adjusting the operating parameters of the power trowel Adjusting the operating parameters of the trowel machine can solve the following quality problems of the concrete surface: Uneven surface: Adjust the speed: The speed of the trowel machine has an important influence on the flatness of the concrete surface. If the speed is too fast, the trowel blade may produce too much cutting force on the concrete surface, resulting in uneven surface; if the speed is too slow, the concrete surface may not be effectively smoothed. By appropriately reducing or increasing the speed of the trowel machine, the blade can act evenly on the concrete surface, which can improve the surface flatness. Adjust the trowel time: If the trowel time is too early, the concrete has not reached a certain strength, and it is easy to produce dents or marks during the trowel process; if the trowel time is too late, the concrete strength is too high, and the trowel machine is difficult to effectively trim the surface. According to factors such as the concrete mix ratio and ambient temperature, reasonable adjustment of the trowel time can make the concrete surface achieve better flatness. Surface sanding: Adjusting the pressure: If the pressure applied by the trowel is too high during operation, the cement slurry on the concrete surface will be over-extruded, resulting in a thin cement slurry layer on the surface, which is prone to sanding; if the pressure is too low, the concrete surface cannot be compacted, which will also affect the surface quality. Properly adjusting the pressure of the trowel so that it can make the concrete surface compact while not over-extruding the cement slurry during operation will help solve the problem of surface sanding. Choose the right blade: Trowel blades of different materials and shapes have different effects on the concrete surface. For example, a blade with higher hardness and sharper edge may cut off some tiny particles on the concrete surface during troweling, increasing the risk of sanding; while a blade with a softer or blunter edge may not be able to effectively compact the surface. Choosing a blade with moderate material and appropriate edge shape can reduce surface sanding caused by blade factors. Surface cracks: Control the troweling speed: If the water on the concrete surface evaporates quickly, if the trowel speed is too fast, it will accelerate the loss of surface water, causing cracks on the concrete surface due to drying shrinkage. Reduce the operating speed of the trowel machine to allow the concrete surface enough time for water migration and cement hydration reaction, which can reduce cracks caused by drying shrinkage. Adjust the number of trowel passes: Too many trowel passes may cause excessive disturbance to the concrete surface, destroy the formed structure, and cause cracks on the surface; too few passes may not make the surface achieve sufficient density and finish. According to the performance and surface condition of the concrete, reasonably adjust the number of trowel passes to ensure surface quality and avoid cracks caused by excessive troweling. Click the below to jump immediately!!! AMOUR JOINT CONCRETE LASER LEVELING MACHINE LIGHT TOWER POWER TROWEL STEEL FIBER TRACKED MINI DUMPER

After the concrete pavement is constructed, the following methods can be used to deal with the surface bubbles Surface treatment – Mechanical surface treatment: Use a trowel to smooth the surface before the concrete is initially set. The rotation and extrusion of the trowel make the concrete surface more compact, squeeze out some bubbles from the surface, and make the surface smoother. The speed and pressure of the trowel should be controlled during operation to avoid excessive pressure causing water seepage or segregation on the concrete surface. – Manual surface treatment: For corners that are difficult to reach with mechanical surface treatment or areas with many local bubbles, manual surface treatment with a trowel is required. Manual surface treatment can trim the concrete surface more carefully, gently crush the bubbles and evenly cover the bubble marks with surface mortar. During the surface treatment process, pay attention to the angle and strength of the trowel, and try to make the surface treatment smooth and uniform. Secondary vibration – After the concrete is poured, when a small amount of water seeps out of the concrete surface and it has not yet set, perform secondary vibration. Use a vibrating rod to vibrate the concrete surface. The vibration time should not be too long. Generally, it is appropriate to stop bubbles from appearing on the concrete surface and to seep out cement slurry. Secondary vibration can further expel the bubbles inside the concrete, while enhancing the compactness of the concrete and improving the quality of the concrete surface. However, be careful to avoid inserting the vibrating rod too deep to damage the formed concrete structure. Needle puncture exhaust – For larger bubbles, you can use a steel needle or other sharp tools to puncture the bubbles before the concrete sets to expel the gas. Then use a trowel to gently compact the punctured bubble area so that the surrounding concrete mortar fills the gaps left by the bubbles. Needle puncture exhaust should be performed in time to avoid bubbles from forming obvious holes or defects after the concrete hardens. Surface repair – If bubbles on the concrete surface still leave obvious marks or small potholes after finishing, you can repair the surface after the concrete has finally set. First, clean the surface of the repaired area to remove dust, debris, etc. Then, according to the color and mix ratio of the concrete, mix an appropriate amount of repair material, such as cement mortar or a special concrete repair agent. Apply the repair material to the bubble marks and smooth it with a trowel to make it smooth and consistent with the surrounding concrete surface. After repair, pay attention to the maintenance of the repaired area to avoid the repair material from losing water and drying too quickly and causing cracks. Maintenance treatment – Reasonable maintenance is also important to reduce the impact of bubbles on the concrete surface. After the concrete is poured, it should be covered with moisturizing materials such as plastic film and geotextile to prevent the water on the concrete surface from evaporating too quickly. At the same time, according to the ambient temperature and humidity, watering maintenance should be carried out in time to keep the concrete surface moist. The maintenance time is generally not less than 7 days. For important concrete pavements or large-volume concrete, the maintenance time should be appropriately extended. Good maintenance can fully hydrate the concrete, improve the strength and density of the concrete, and reduce surface defects caused by water evaporation and concrete shrinkage, including bubble-related problems.

The best time to use a power trowel to treat the concrete surface depends on many factors. Including the type of concrete, environmental conditions, and specific construction requirements. Generally speaking, when the bleeding on the concrete surface has basically disappeared, and the concrete has reached a certain strength and can withstand the weight of the ride on power trowel machine without obvious deformation and footprints, it is a good time to use a power trowel machine for treatment. Usually within 1-3 hours after the concrete is poured, the specific time will vary depending on the concrete mix ratio, ambient temperature, humidity and other conditions. If the treatment time is too early, there is too much water in the concrete, and the concrete machinery power trowel is easy to cause bleeding and sand on the concrete surface during operation, affecting the surface quality; if the treatment time is too late, the concrete strength is too high, and the power trowel is difficult to effectively smooth the concrete surface and may damage the equipment. In actual construction, construction personnel need to judge the best smoothing time based on the specific state of the concrete on site and experience to ensure that a smooth, flat and wear-resistant concrete surface is obtained through the treatment of the concrete power trowel machine. When determining the power trowel machine use time, environmental factors also need to be considered. In a high temperature and dry environment, the moisture in the concrete evaporates quickly, and the initial setting time may be advanced. It is necessary to observe the state of the concrete surface in time and use the trowel machine as soon as possible; in a low temperature and humid environment, the initial setting time of the concrete will be prolonged, and the use of the trowel machine should be appropriately postponed to avoid affecting the smoothing effect. In addition, different power trowel manufacturers may give different suggestions on the use time of the trowel machine based on their product characteristics. Therefore, before construction , the trowel machine's instruction manual should be carefully read and adjusted according to the actual situation to ensure the best concrete surface treatment effect. Click the below to jump immediately!!! AMOUR JOINT CONCRETE LASER LEVELING MACHINE POWER TROWEL LIGHT TOWER SLIPFORM MACHINE TRACKED MINI DUMPER

When laying double-layer steel mesh for different types of building structures, there are certain differences in the steel mesh spacing standards. The following is a detailed introduction for you Slab structure General concrete slab: According to the "Concrete Structure Design Code", when the slab thickness is not more than 150mm, the steel bar spacing should not be greater than 200mm; when the slab thickness is greater than 150mm, the steel bar spacing should not be greater than 1.5 times the slab thickness, and should not be greater than 250mm. Residential roof panels: For multi-story residential roof panels, when the roof panels are at the corners of the house and the span ≥3.9m, double-layer bidirectional continuous steel bars should be set. The steel bar spacing at the corners should not be greater than 100mm, and the steel bar spacing of the floor slab with a span of ≥3.9m should not be greater than 150mm. The steel bar diameter should not be less than φ8. Highway cement concrete pavement: When cold-rolled ribbed steel bars are used, the steel bar diameter should not be less than 8mm, the longitudinal steel bar spacing should not be greater than 200mm, and the transverse steel bar spacing should not be greater than 300mm. Column structure Rectangular column: The horizontal spacing should not be greater than 200mm, and the vertical spacing should not be greater than 300mm. Circular column: The horizontal spacing should not be greater than 150mm, and the vertical spacing should not be greater than 200mm. Wall structure General wall: Usually the horizontal and vertical steel bars are spaced about 150-300mm, which is determined according to the stress conditions, height, thickness, etc. of the wall. For example, the spacing of the steel bars in the filling walls of some buildings may be larger; while for the shear walls under stress, the spacing of the steel bars will be relatively small to ensure the shear and bending resistance of the wall. Hydraulic structure wall: Due to the high requirements for waterproofing and anti-seepage, the spacing of the steel bars is usually small and the arrangement is dense. Generally, the horizontal and vertical steel bars are spaced 100-200mm to improve the crack resistance and anti-seepage of the concrete and prevent water leakage. Beam structure For general beams, the longitudinal steel bar clearance shall not be less than 30mm at the top and 25mm at the bottom, and shall not be less than the steel bar diameter. The upper row clearance at the bottom shall not be less than twice the lower row clearance, and the upper and lower rows clearance shall not be less than 25mm. When the beam bears a large load or has special requirements, the steel bar spacing may be appropriately adjusted according to the calculation, but it must meet the minimum spacing required by the specification to ensure that the steel bar and concrete work together and facilitate the pouring and vibration of the concrete. Long-span structures and high-rise buildings Long-span structures: such as long-span bridges and gymnasium roofs, in order to ensure the safety of the structure under large loads and deformations, the steel mesh spacing is usually small and the steel bars are densely configured, generally between 100-200mm, which is determined by structural calculation according to the span size, load type, etc. High-rise buildings: The loads borne by its foundations, columns, walls, beams and other structural components are large, and there are strict requirements for the steel mesh spacing. For example, the spacing of steel bars in the foundation raft of a high-rise building is generally 150-250mm; the spacing of steel bars in shear walls is usually 150-300mm; the spacing of steel bars in frame columns and beams is similar to that in ordinary buildings, but may be denser in some key parts to improve the seismic performance and bearing capacity of the structure. It should be noted that the above steel mesh spacing standards are only for reference. The determination of the steel mesh spacing in actual projects needs to be determined by professional structural engineers based on the specific project conditions, following relevant design specifications and standards, and through rigorous calculation and analysis.

When laying double-layer steel mesh, the determination of the steel mesh spacing needs to consider multiple factors. The following is a detailed introduction Design specification requirements – Different building structure types and usage functions have clear steel mesh spacing requirements in the design specifications. For example, for general concrete slab structures, according to the "Concrete Structure Design Code", the spacing of steel bars should not be less than 70mm, when the slab thickness is not more than 150mm, the steel bar spacing should not be more than 200mm; when the slab thickness is more than 150mm, the steel bar spacing should not be more than 1.5 times the slab thickness, and should not be more than 250mm. For structures with special requirements, such as basement top slabs, hydraulic structures, etc., the specifications may have stricter regulations. Force analysis calculation – Through structural mechanics calculations, determine the load size, distribution, and force transmission path of the concrete structure during use. According to the calculation results, the steel mesh is reasonably arranged to meet the bearing capacity and deformation requirements of the structure. For example, in a two-way slab subjected to a large bending moment, in order to effectively resist the bending moment in both directions, it is necessary to determine the spacing of the steel mesh in different areas according to the bending moment diagram. Generally speaking, in areas with large bending moments, the spacing of the steel mesh should be appropriately reduced to provide sufficient bending resistance; while in areas with small bending moments, the spacing of the steel mesh can be appropriately increased, but it must meet the minimum spacing requirements of the specification. Concrete pouring and vibration process – Consider the pouring method of concrete and the performance of the vibration equipment to ensure that the concrete can fully wrap the steel bars and vibrate densely during the pouring and vibration process. If the spacing of the steel mesh is too small, it will affect the fluidity of the concrete and the insertion of the vibrator, making it difficult to pour the concrete densely, and it is easy to have quality problems such as honeycombs and rough surfaces; if the spacing is too large, it will affect the restraint of the steel bars on the concrete and reduce the integrity of the structure. For example, when pumping concrete, due to the large fluidity of the concrete, the spacing of the steel mesh can be relatively small, but it is also necessary to ensure that the vibrator can be smoothly inserted for vibration. In general, in order to facilitate the operation of the vibrator, the net spacing of the steel mesh should not be less than 1.5 times the diameter of the vibrator. Specifications and types of steel bars – Steel bars of different specifications and types have different bearing capacities and deformation properties, which will affect the determination of the spacing of the steel mesh. For example, high-strength steel bars can withstand greater tensile forces, and their spacing can be appropriately larger than ordinary steel bars on the premise of meeting the structural force requirements. For steel bars with larger diameters, in order to ensure sufficient bonding between the steel bars and concrete, and to avoid excessive concentration of steel bars leading to difficulties in concrete pouring, the spacing of the steel meshes also needs to be increased accordingly. Generally speaking, the larger the diameter of the steel bar, the larger the spacing of the steel meshes should be. For example, when using steel bars with a diameter of 10mm, the spacing may be 150-200mm; and when using steel bars with a diameter of 12mm, the spacing may be 180-250mm. In actual projects, the determination of the spacing of the steel meshes needs to be determined by professional structural engineers based on the specific project conditions, taking into account the above factors, through rigorous calculation and analysis, and following relevant design specifications and standards to ensure the safety, applicability and durability of the structure.

The influence of the laying direction of the steel mesh on the building structure is mainly reflected in the following aspects Stress performance Relationship with the direction of principal stress: The main function of the steel mesh is to bear the tensile force in the concrete structure. When the structure is stressed, the principal stress will be generated inside the concrete. The laying direction of the steel mesh should be consistent with the principal stress direction as much as possible, so that the tensile strength of the steel bars can be fully exerted and the bearing capacity of the structure can be effectively improved. For example, in a one-way slab, the load is mainly transmitted along the short span direction, and the direction of the principal tensile stress is also roughly along the short span direction. Therefore, the bottom steel mesh is usually arranged along the short span direction to resist the tensile force. Two-way stress situation: For a two-way slab, the spans in both directions are similar, and both bear a large load. The steel mesh in both directions must bear tensile force. At this time, the steel mesh should be arranged in a certain proportion according to the force size in the two directions, and is generally laid perpendicular to each other, so that the structure can have sufficient bearing capacity and good deformation performance in both directions. Crack resistance Control of crack direction: A reasonable laying direction of the steel mesh can guide the development direction of the crack, so that it develops in the direction with less influence on the structural force. For example, in concrete pavement, transverse reinforcement can limit the development of longitudinal cracks, while longitudinal reinforcement can restrain transverse cracks, thereby improving the integrity and durability of the pavement. Improving crack resistance: When the steel mesh is laid along the direction where cracks may occur, it can play a "bridge" role after the concrete cracks, withstand the tension on both sides of the cracks, and prevent the cracks from further expanding. For example, in the wall of a hydraulic structure, the horizontal and vertical steel meshes work together to effectively improve the wall's ability to resist cracks caused by factors such as temperature changes and concrete shrinkage. Structural durability Protecting steel bars: The correct laying direction of the steel mesh helps to ensure the protective effect of concrete on the steel bars. The steel bars are wrapped in concrete to prevent them from rusting and corroding when exposed to the external environment. If the steel mesh is laid improperly, resulting in deviation in the position of the steel bars or uneven thickness of the protective layer, the steel bars are prone to rust under the action of external corrosive media, thereby reducing the durability of the structure. For example, in the basement structure of a building, the laying of the steel mesh should ensure that there is a sufficient and uniform concrete protective layer to prevent groundwater from corroding the steel bars. Uniform stress: Reasonable laying direction makes the steel mesh evenly stressed in the structure, avoiding premature destruction of concrete due to local stress concentration, thereby providing a stable protective environment for the steel bars and extending the service life of the structure. In short, the laying direction of the steel mesh is an important factor affecting the performance of the building structure. During the construction process, the laying direction of the steel mesh must be reasonably determined according to the stress characteristics and design requirements of the structure to ensure the safety, applicability and durability of the building structure.

In addition to the angle, there are many other factors that affect the performance of the trowel. Here are some of the main aspects Performance and state of concrete Slump: Slump reflects the fluidity of concrete. If the slump is too large, the concrete is too thin and soft, and it is easy to seep water and slurry when troweling, making it difficult to form a solid surface, and cracks are easy to appear on the surface after troweling; if the slump is too small, the concrete is too dry and hard, and it is difficult for the trowel blade to effectively trowel it, which will cause uneven surface and increase the workload of the trowel. Setting time: The setting time of concrete is crucial for troweling. If troweling is performed before the initial setting of concrete, the concrete is still in a plastic state and can be easily smoothed by the trowel, but troweling too early may damage the internal structure of the concrete and affect its strength; if troweling is performed after the final setting, the concrete has hardened, and it is difficult for the trowel to operate it effectively, leaving trowel marks on the surface, and it is impossible to achieve the ideal flatness and finish. Parameters and performance of trowels Speed: The speed of the trowel directly affects the troweling effect. If the speed is too low, the blade will not be able to vibrate and smooth the concrete surface enough, and the cement slurry on the concrete surface cannot be evenly distributed, resulting in poor surface finish; if the speed is too high, the concrete surface will be subjected to excessive centrifugal force, which may cause cement slurry splashing, and will also increase the wear and energy consumption of the machine. Power: The power determines the working capacity of the trowel. If the power is insufficient, when encountering large concrete resistance during the troweling process, the trowel may be underpowered, resulting in unsmooth rotation of the blade, affecting the troweling effect; if the power is too high, it may cause energy waste, and it is easy to cause excessive vibration and damage to the concrete surface if the operation is improper. Operator's skills and experience Operation technique: The operator's operation technique has a great impact on the troweling effect. Skilled operators can reasonably control the travel speed, direction and troweling time of the trowel according to the state of the concrete and the performance of the trowel, so that the concrete surface can achieve a flat and smooth effect; while unskilled operators may encounter problems such as uneven travel speed, overlapping or missing troweling areas, resulting in poor troweling quality. Judgment ability: Experienced operators can accurately judge the setting time and state of concrete and choose the right time to perform the troweling operation. They can also adjust the parameters and operation methods of the troweling machine in time according to the problems that occur during the troweling process, such as bubbles and trowel marks on the surface; while inexperienced operators may not be able to accurately judge these situations, thus affecting the troweling effect. Operation environment conditions Temperature: The ambient temperature has a significant impact on the setting time and troweling effect of concrete. In a high temperature environment, the moisture of concrete evaporates quickly, the setting time is shortened, the troweling operation time window becomes smaller, and surface shrinkage cracks are prone to occur; in a low temperature environment, the setting time of concrete is prolonged, and the troweling quality may be affected by the freezing of the internal moisture of the concrete during troweling, and it will also increase the difficulty of starting the troweling machine and energy consumption. Humidity: If the ambient humidity is too high, the moisture on the concrete surface is not easy to evaporate, which will delay the setting time of the concrete, resulting in water seepage on the surface after troweling; if the humidity is too low, the moisture on the concrete surface evaporates too quickly, and problems such as surface dryness and peeling are prone to occur, affecting the troweling effect. Wind speed: Higher wind speed will accelerate the evaporation of moisture on the concrete surface, causing uneven drying of the concrete surface, increasing the difficulty of polishing, and may also cause cracks on the polished surface.

Improper adjustment of the power trowel blade angle will cause the following damage to the blade Accelerated wear – When the blade angle is too large, the contact angle between the blade and the concrete surface is too vertical. During the troweling process, the friction and shear force on the blade will increase. This will cause the material on the blade surface to wear faster, making the blade edge blunt and reducing the service life of the blade. – If the blade angle is too small, the contact area between the blade and the concrete surface will increase, and the pressure per unit area will decrease. However, since it takes longer and more troweling operations to achieve the desired effect, the number of frictions between the blade and the concrete will increase, which will also accelerate the wear of the blade. Deformation – When the angle is too large, the pressure and torque on the blade during work are large, which can easily cause the blade to bend and deform. This deformation may be more obvious when working continuously for a long time or handling hard concrete. – If the angle is too small, although the pressure on a single blade is relatively small, due to the uneven overall force, the blade will be subjected to uneven force during rotation, which may also cause the blade to twist or deform in the long run. Cracks or even breaks – Due to improper angle adjustment, the blade will be subjected to abnormal stress during operation. When the stress exceeds the bearing limit of the blade material, cracks will appear on the blade surface. If the cracked blade continues to be used, the crack may gradually expand and eventually cause the blade to break. – When the angle is too large, the impact force on the blade is greater, which is more likely to cause cracks and breaks; when the angle is too small, the blade will also crack due to fatigue under repeated unbalanced stress, increasing the risk of breakage.

When there are bubbles on the concrete surface, in addition to the method of adjusting the operating parameters of the trowel machine mentioned above, further adjustments can be made from the following aspects Increase the number of trowel passes Appropriately increase the number of trowel passes of the trowel machine, so that the blade squeezes and presses the concrete surface multiple times, which helps to further squeeze out the bubbles inside the concrete and make the concrete surface more compact and smooth. However, attention should be paid to the time interval between each trowel. It is not advisable to perform the next trowel before the concrete reaches a certain strength, so as not to damage the concrete structure. Generally speaking, it is more appropriate to perform 2-3 trowels after the initial setting of the concrete and before the final setting. Adjust the pressure of the trowel machine The pressure of the trowel machine on the concrete surface can be appropriately reduced. If the pressure of the trowel machine is too high, a harder "shell" will form on the concrete surface, which is not conducive to the discharge of bubbles, but may seal the bubbles inside the concrete. By adjusting the counterweight or hydraulic system of the trowel machine, the trowel machine can apply a more appropriate pressure to the concrete surface during operation, so that bubbles can escape the surface more easily. The specific pressure adjustment value needs to be tested and explored according to the state of the concrete and the situation of bubbles. In the process of adjusting the operating parameters of the trowel machine, it is necessary to closely observe the changes on the concrete surface and make fine adjustments to the parameters in time according to the actual effect to achieve the best trowel effect and eliminate bubbles on the concrete surface. At the same time, it is also possible to combine measures such as optimizing the concrete mix ratio and improving the pouring process to fundamentally reduce the generation of bubbles on the concrete surface.

Improper blade angle adjustment will affect the working efficiency of the trowel machine, as follows Increase trowel time When the blade angle is too large, the blade cuts too deep into the concrete surface. In each trowel stroke, the blade's role on the concrete is mainly scraping rather than leveling and troweling. It takes many repeated operations to achieve a certain degree of flatness, which undoubtedly increases the trowel time. If the blade angle is too small, due to insufficient pressure on the concrete surface, it is impossible to effectively fill the low-lying areas on the concrete surface at one time, and repeated trowel operations are also required, resulting in longer overall working time. Reduce machine travel speed Improper blade angle adjustment will change the resistance encountered by the trowel machine during operation. For example, if the angle is too large, the machine needs to overcome greater resistance to move forward, which will significantly reduce the machine's travel speed. Similarly, if the angle is too small, although the resistance may be relatively small, since the concrete cannot be effectively troweled, in order to ensure the quality of troweling, the operator will have to reduce the machine's travel speed to increase the contact time between the blade and the concrete surface, thereby reducing work efficiency. Increased energy consumption Due to improper blade angle, the trowel machine needs to consume more energy to overcome additional resistance or complete multiple repetitive operations during operation. For example, when the angle is too large, the motor needs to output more power to drive the blade to rotate and the machine to move forward, resulting in increased energy consumption. At the same time, the machine may also shorten its service life under high load operation, increase maintenance costs and downtime, and further affect work efficiency.