Emery floor cleaning Emery wear-resistant floor cleaning and maintenance

-Residential floor construction: During the construction or decoration of family houses, small concrete trowels can be used for concrete troweling of floors such as living rooms, bedrooms, kitchens and bathrooms. The floor area of ​​these areas is relatively small, and small trowels are easy to operate, which can make the floor flat and smooth, providing a good foundation for the subsequent laying of floor tiles, wooden floors and other decorative materials. -Indoor floor of small commercial buildings: Small concrete trowels are also suitable for indoor floor construction in commercial places such as small shops and offices. It can ensure that the flatness of the floor meets the requirements and create suitable conditions for installing various floor coverings or directly using the floor. – For some small warehouses, small concrete trowels can efficiently polish the floor. It can make the warehouse floor more solid and flat, which is convenient for the stacking of goods and the driving of handling equipment. In addition, the floor after polishing is more wear-resistant and can effectively resist the friction of goods and vehicles in the warehouse. -Sidewalk construction: In the construction of urban sidewalks, small concrete trowels can be used to smooth the concrete pavement of sidewalks. Since the width of the sidewalk is relatively narrow, the small trowel can flexibly operate along the edge and middle part of the road to make the sidewalk surface smooth, improve the comfort of pedestrians, and also facilitate drainage. -Small squares: For places such as leisure squares and small commercial squares in residential areas where the ground area is not particularly large, small concrete trowels can well complete the polishing of the concrete surface. It can create a smooth and beautiful ground to meet people's daily leisure and activity needs. – After repairing some small concrete structures, such as the local repair of the bridge deck of a small bridge, and the local damage repair of the concrete wall or ground of a building, the small concrete trowel can be used to smooth the repair area. It can make the repaired surface smooth and consistent with the original structure surface, ensuring the appearance and performance of the structure.

In order to ensure the construction quality of concrete floors, more and more construction units are choosing to use precision laser leveling machines to lay concrete floors. However, in the process of actual construction work, because some enterprises do not cooperate in the construction work in place, or do not strictly follow the regulations and operate correctly, the problem of low construction quality of concrete floors sometimes occurs. In order to avoid the recurrence of this kind of situation, our company has detailed some construction cooperation matters during the construction process of the laser leveling machine as follows, and we hope that the relevant construction personnel must keep in mind. ❖Wire setting and leveling at the wall: Since the laser leveling machine at the wall cannot be touched, manual leveling is required within 200mm from the wall, so line setting is required as a reference for manual leveling. At the same time, 2 to 3 benchmark points (ground design elevation, ie ±0.0) that will not be disturbed during the construction period are set up for the laser leveling machine at one time, and good communication with each other is required. Bench point accuracy ±1mm. ❖Set formwork (steel formwork, position according to design requirements) along the periphery of the column to form separation joints. The elevation of the top surface of the formwork should be controlled within +0mm and -2mm, so as not to affect the flatness of the joints. ❖Install the construction joint formwork (steel formwork is recommended) along the range to be poured on the day, and the formwork should reserve holes with a spacing of 300mm for the insertion of dowel bars. The elevation of the top surface of the formwork should be controlled within +0mm and -2mm, so as to avoid large deviations in the flatness of the joints of different warehouses. ❖Establishment of the laser transmitter: It is intended to be erected on the column. The specific position should be set in a better position according to the amount of shop injection on the day. If it cannot be erected on the column, it should be erected on a special tripod. ❖In order to ensure the quality of concrete floor paving, each group needs to arrange 10-12 workers to cooperate to level the surface of the concrete paved on the ground, so that the stacking height is slightly higher than the design level (about 20-30mm). At the same time, for the parts near the wall, the outcropping pipeline and the surrounding formwork, arrange 2 workers to manually smooth the concrete material about 20~30cm away from the wall (formwork) side (using a 2m scraper and an iron trowel). Workers responsible for plastering must be trained skilled plasterers. These workers must obey the command and follow the arrangement in order to ensure the quality of the construction. ❖Since the thickness of the concrete reaches 200mm, and due to the setting of steel mesh, in order to ensure that the concrete is compacted by vibration, this project needs to arrange a vibrator to cooperate with the vibration. At the same time, in order to ensure that the protective layer of steel mesh reaches the thickness required by the design (70mm), it is necessary to arrange in advance to manually lift the steel mesh and place support blocks in the area to be laid. ❖The width of the concrete material laid on the platform is required to be no more than 5m each time, and the length is subject to the formwork boundary. The construction direction is from left to right (along the short side direction), from front to back (along the long side direction). The daily injection volume is recommended to be 1200~1500㎡. Calculated on the basis of 12 hours of working time per day, this requires a feed rate of 30 to 40m³. ❖Others: In order to ensure the flatness of the ground, special attention should be paid during the construction of the laser leveling machine: the slump of the concrete sent to the platform must be consistent each time; the concrete feeding speed must reach 40m/h or above, and each batch of concrete The initial setting time must be consistent; ensure that the formwork elevation is accurate, and cannot be disturbed during construction; the environment is coordinated. The concrete floor that has just been constructed cannot be exposed to sunlight, wind, rain, etc. that are unfavorable to concrete health.

    The occurrence of surface defects in concrete is often not caused by a single factor, but rather the result of the combined effects of materials, the environment, construction techniques and equipment operation. As the final key process in floor forming, the operation mode of the power trowel machine directly affects the final quality of the surface. The following is a detailed analysis of the causes of common surface defects, with a focus on elaborating their correlation with the operation of the power trowel machine. The function of the power trowel machine is to compact, lift the slurry and smooth the surface of the concrete through the high-speed rotating power trowel. Improper operation can directly lead to or exacerbate the following problems: Disrupt the uniformity of concrete (such as bleeding and segregation). Change the water-cement ratio on the surface layer (such as by sprinkling water and grinding). Introduce inappropriate stress (premature heavy-load operation leads to cracking). It is impossible to effectively make up for the deficiencies of the previous processes. Defect description: Insufficient surface strength, loose cement and fine sand shedding. The fundamental cause The water-cement ratio on the surface is too high (bleeding or excessive watering). The cement grade is insufficient or the quality is poor. Improper maintenance causes the surface to lose water too quickly. The correlation with the operation of the power trowel machine (main reason) : Premature operation: Start smoothing the concrete when there is still a large amount of bleeding, removing the cement slurry and leaving only the sand. Excessive water sprinkling on flour grinding: This is the most fatal operation. When the surface is dry, workers sprinkle water to save effort, which greatly increases the water-cement ratio of the surface layer and seriously reduces the surface strength. The timing of power trowel is too late: The concrete has already begun to set, and the power trowel cannot effectively lift and compact the slurry. It merely "scraped" once and failed to bring the cement slurry to the surface. Improper blade Angle or severe wear: Unable to effectively compact the surface layer. Defect description: Irregular, shallow and fine reticular cracks appear on the surface. The fundamental cause The evaporation rate of surface moisture is greater than the bleeding rate (in high-temperature, windy, and low-humidity environments). Concrete itself has poor bleeding. Correlation with the operation of the power trowel machine: Failure to seal the surface in time: The first (bottom grinding) process of the power trowel is of vital importance. That is, under the aforementioned environmental conditions, when the concrete can reach the person mentioned above (about 25-30mm deep footprint), the power trowel should be used in conjunction with the disc to lift the slurry and seal it in time to prevent the water from evaporating too quickly. If the waiting time is too long and the crack has already formed, it will be of no avail to smooth it out. Improper operation aggravates water loss: The high-speed rotating power trowel generates heat by rubbing against the concrete and accelerates water evaporation under the influence of air flow. In harsh environments, attention should be paid to operational efficiency. After completing a certain area, timely maintenance should be carried out. Defect description: The ground is overall uneven, with a "ladle" or "wavy" feeling. The fundamental cause The initial flatness control of the laser screed is not good. The slump of the concrete is uneven. The correlation with the operation of the power trowel machine (main reason) : The operation method is not professional Without adopting the "horizontal and vertical cross" method: Always grinding in the same direction, it is easy to form a "furrow" effect, resulting in strip-shaped protrusions. If the machine body stays in one position for too long, the weight of the power trowel and vibration will cause that area to slightly sink, forming a "dent". Improper timing of raising or lowering the arm: When changing direction, failing to lift or lower the power trowel plate/power trowel smoothly can result in knife marks or local protrusions. Uneven walking speed: The inconsistent speed leads to different degrees of compaction, resulting in color differences and slight height differences. Defect description: The ground color varies in depth. The fundamental cause The raw materials (especially cement) vary from batch to batch. The pouring interval is too long, resulting in cold joints. Correlation with the operation of the power trowel machine: The timing of the finishing is not accurately grasped: There are slight differences in the initial setting time of concrete in different areas. If the operator stops the light in some areas when it is still bleeding (the color is bright), while in others when it is close to final setting (the color is dark), a color difference will occur. Repeatedly grinding the same area: Repeatedly grinding a relatively wet local area will result in excessive slurry in that area and a color that is different from other areas. Uneven watering: If water is sprinkled locally to grind the surface, it will directly cause the water-cement ratio in that area to be different, resulting in a lighter and whiter color. Defect description: The surface-hardened layer has detached from the lower layer. The fundamental cause The surface is over-polished, forming a dense but fragile cement paste layer, which is inconsistent with the contraction of the lower layer. The lower layer of concrete has severe bleeding, forming a water film and weakening the interlayer bonding force. The correlation with the operation of the power trowel machine (key reason) : Excessive finishing: Forcing the use of a power trowel machine after the concrete has r To avoid the above-mentioned defects, the operation of the power trowel machine should follow the principle of "timely and moderate". Operation stage Key points for correct operation Purpose and avoidable defects Initial grinding (pulp extraction Timing: When the foot sinks by about 3 to 5mm. Objective: To remove the slurry on the surface of the aggregate and seal the surface. Tool: Install the disc. Avoid: Cracking and sanding. Technique: Move at a constant speed and cover the entire area. Smooth (finely grind Timing: After initial grinding, the surface is free of moisture and has a matte color. Objective: To eliminate scratches, fine deviations and further compact. Tool: Replace with a fine power trowel (power trowel). Avoid: poor waviness and color difference. Technique: Use the horizontal and vertical intersection method, maintain a uniform speed, and lift the arm to press down steadily. Fine grinding (finishing) Timing: After smoothing, there is almost no trace left when stepped on (close to final setting). Objective: To obtain a dense and smooth surface. Tool: The same or thinner spatula, adjusted to a small Angle. Avoid: hollowing, color difference, and cracks caused by excessive dimming. Technique: Gentle and steady, succeed in one go, avoid repetition. The Golden Rule 1. No sprinkling water! If the surface does lose water prematurely, a very small amount of water should be sprayed with a sprayer, and this should be done before the initial grinding. Eliminate most surface defects fundamentally. 2. Timing is the key! Closely observe the setting state of the concrete rather than the rigid time. 3. "Intersection" and "uniformity" are at the core of flatness. An excellent power trowel operator is not only a machine operator but also an "observer" and "manager" of the concrete setting process. He needs to understand the fundamental principles of materials science, and through precise operation timing and proficient techniques, transform the solid foundation created by the laser screed into a high-quality floor with high strength, high flatness and no defects.   Note: The parameters provided in this document are for reference only and are not mandatory. Due to differences in technical characteristics between different brands and models of laser levelers, please consult the manufacturer for a suitable solution before actual operation. This reference document assumes no responsibility for any issues arising from failure to follow the manufacturer's instructions.