How to Select Diamond Grinding Discs for Concrete

Three options for rough grinding and leveling of concrete floor surfaces

The first type:

The first step in rough grinding and leveling the concrete floor surface is to use a 50# diamond resin pad. These discs are designed to actively remove surface imperfections and irregularities, resulting in a more uniform surface. This initial rough grinding stage is critical to addressing any noticeable bumps, dips, or other irregularities in the concrete.

After the initial rough grinding is completed, continue to use 100# and 200# resin diamond grinding discs. These finer grit discs can further refine the surface, smoothing any remaining rough patches and creating a more polished look. This step-by-step sanding process ensures that the concrete floor is gradually leveled and smoothed, resulting in a high-quality finish.

This method is particularly effective for addressing emery concrete wear floors or relatively flat travertine floors that have been ground and polished but have become old and stained over time. These types of surfaces often require a thorough sanding and leveling process to restore their appearance and functionality.

The second type:

The second type of rough surface grinding is to use 100# or 150# resin diamond grinding discs to grind the previously treated relatively flat concrete surface. This method is particularly effective at removing shallow contamination, hardware drag marks, or floors that have been corroded by acidic agents. The process begins with carefully sanding away surface imperfections and irregularities to create a more even and level base for further processing.

One of the main advantages of using resin diamond grinding discs for rough surface grinding is their ability to effectively remove surface imperfections while maintaining control of the grinding process.  The 100# or 150# grit size is moderately aggressive, making it suitable for addressing various types of surface irregularities without causing undue damage to the concrete.

Additionally, after the initial rough grinding process, the treated surface can undergo further steps such as hardener penetration, additional grinding, and polishing to meet specific process and functional requirements. This comprehensive approach ensures that the concrete floor surface is not only smooth but also ready for subsequent processing, resulting in a mirror-like finish.

The third type:

The third type of rough grinding and leveling involves using coarser metal concrete grinding shoes, usually using 16#, 30#, or 50# grit, to open the pores on the concrete surface. This method is widely favored for its effectiveness in creating smooth, uniform concrete floors, making it a popular choice for practical applications. By grinding the surface to a high level of smoothness, the foundation is laid for subsequent polishing steps to achieve the desired finish for customer satisfaction.

One of the main advantages of using a coarser metal blade grinding block is its ability to open up the pores in the concrete surface, allowing for better adhesion and penetration of subsequent treatments. This process not only smoothes the surface but also prepares it for further refinement, ensuring the concrete floor is ready for the next stage of polishing and finishing.

The correct choice of grinding shoes for rough grinding, leveling and grinding:

When rough grinding and leveling concrete floors, the success of the process depends not only on the grinding pressure of the mechanical grinding disc but also on the cutting force of the metal head grinding block. The sharpness and wear resistance of the cutting head, as well as the particle size and uniformity of the diamond particles in the grinding block, play a crucial role in obtaining the best results.

The cutting force of the metal cutter head grinding block is a key factor in the rough grinding and leveling of concrete floors. This force is directly affected by the sharpness and wear resistance of the cutter head, which in turn is determined by the size and uniformity of the diamond particles in the grinding block. The coarser and more uniform the diamond particles in the grinding block, the sharper and the higher the grinding efficiency. In contrast, passivated diamond particles lead to reduced grinding efficiency. Therefore, the selection of grinding block and grinding disc mesh should be tailored according to the specific conditions of the site to ensure the best cutting force and efficiency.

In addition to the size and uniformity of the diamond particles, the selection of the grinding block matrix as a carrier for the diamond particles is also crucial. The matrix is ​​composed of various metal powders or a mixture of metal powders and resin, coated with diamond particles or powder. The composition and quality of the matrix significantly affect the overall performance and durability of the grinding block. Choosing the right matrix ensures effective retention and distribution of diamond particles, ultimately contributing to overall cutting force and efficiency during rough grinding and leveling.