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To achieve a shiny, new-looking surface on concrete floors, the choice of polishing pad is crucial. Whether you’re leveling, rough grinding, fine grinding, or polishing, the right polishing pad can significantly improve grinding efficiency and quality. This guide will instruct you on how to select the appropriate polishing pad for each stage of floor grinding and will explain the advantages and disadvantages of wet and dry grinding methods.
Selecting a Grinding Pad Based on the Process: Thickness Determines Efficiency
The thickness of the grinding pad plays a crucial role in the efficiency of each stage of the grinding process. Below are the five key stages of floor grinding and a detailed introduction to the grinding pads suitable for each stage:
Upgrade phase:
- Recommended grinding pads: Diamond grinding pads with a thickness of 4-6 mm.
- Function: These pads are specifically designed to correct uneven surfaces, easily resolving height differences of 3 mm or more. They are essential for floor preparation before subsequent grinding processes.
Coarse grinding:
- Recommended gasket: Medium thickness gasket (3-4 mm).
- Functionality: At this stage, a single machine can process up to 600 square meters per day, increasing efficiency by 30%. These pads effectively remove visible surface defects and prepare the floor for fine grinding.
Fine grinding:
- Recommended gasket: Thinner gasket (1.5-2 mm).
- Function: These polishing pads are used to further refine surfaces, remove any remaining imperfections, and prepare for polishing floors.
Polishing:
- Recommended gasket: Ultra-thin gasket (1.5-2 mm).
- Function: The focus at this stage is to achieve a high-gloss surface. A suitable polishing pad can enhance the floor’s shine and clarity, transforming it into a mirror-like smooth surface.
Dry Grinding Vs. Wet Grinding: The Setting Determines the Outcome
Dry grinding and wet grinding methods each have their advantages, and the specific choice depends on the specific requirements of the project.
Wet grinding
- Environmental benefits: Compared to dry milling, wet milling can reduce dust concentration by up to 80%, making it easier to obtain green building certification. This method revolutionizes traditional processes while minimizing environmental impact.
- Health protection: The water mist used in wet grinding traps dust, keeping the silica concentration in the work area below 0.1 mg/m³, which meets national safety standards. This significantly reduces the risk of silicosis and other respiratory diseases.
- Extended grinding pad life: Wet grinding of medium-to-high hardness surfaces can extend the lifespan of metal grinding pads to 500 square meters per set, reducing costs by 40%. This extended lifespan makes wet grinding a cost-effective option for large-scale projects.
- Matte Finish: Gradual wet sanding with 800 to 3000 grit sandpaper effectively removes metal scratches, creating a soft matte finish with a gloss level of 25-35 GU (Gloss Units). This finish not only enhances the appearance but also makes daily maintenance more convenient and economical.
Dry grinding
Mirror magic: Achieving high reflectivity
A key advantage of dry polishing technology is its ability to increase floor reflectivity to over 90 Gloss Units (GU). For reference, marble typically has a reflectivity of around 80 GU. This significant increase in reflectivity can instantly transform a commercial space into a dazzling “crystal palace.” The high-gloss surface not only enhances the aesthetic value of the space but also creates a clean and professional atmosphere.
The soft soil problem: How to cope with low-strength ground
Dry grinding technology is particularly effective in addressing issues related to “poor-quality” floors (i.e., concrete surfaces with a compressive strength below 20 MPa). These low-strength floors are easily damaged and present significant challenges during installation. Dry grinding allows for precise control of scratch depth, limiting it to ≤0.1 mm. This high precision can significantly reduce rework rates by up to 50%, ensuring the floor achieves the desired surface finish while maintaining its integrity.
Dry and wet mixing process: The golden rule
Combining wet grinding and dry polishing produces a powerful synergistic effect, maximizing the advantages of both methods. This “golden formula” comprises two key steps:
Wet grinding stage (100-3000 mesh):
Wet polishing thoroughly removes scratches and imperfections, creating a smooth surface for subsequent polishing stages. By using sandpaper with grits ranging from 100 to 3000, operators can achieve a fine surface, preparing it for subsequent high-gloss finishing processes.
Dry polishing stage (3000-5000 grit):
Following wet sanding, the dry polishing stage infuses the surface with a “high-gloss polishing layer.” By using finer sandpaper, ranging from 3000 to 5000 grit, this stage can increase reflectivity by two levels, resulting in a stunning mirror-like shine.
Actual test data: Cost-effectiveness and uniformity
Combining wet grinding and dry polishing not only enhances the aesthetics of the floor but is also cost-effective. Actual test data shows that this hybrid process can reduce total costs by 35%. Furthermore, gloss uniformity differences are controlled to within 5%, ensuring a consistent and high-quality finish across the entire surface.
In Conclusion
Choosing the right polishing pad is crucial for achieving a high-gloss finish on concrete floors. Understanding the specific requirements of each stage of the polishing process, as well as the advantages of wet and dry polishing, will help you make an informed choice, improving both efficiency and quality. Whether you opt for environmentally friendly wet polishing or convenient dry polishing, the right polishing pad can help transform ordinary concrete floors into a mirror-like surface, enhancing the aesthetic appeal of any space.
